Plastic

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Plastic
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Household items made of various types of plastic A plastic material is any of a wide range of synthetic or semi-synthetic organic solids used in the manufacture of industrial products. Plastics are typically polymers of high molecular mass, and may contain other substances to improve performance and/or reduce costs. Monomers of plastic are either natural or synthetic organic compounds. The word plastic is derived from the Greek πλαστικός (plastikos) meaning capable of being shaped or molded, from πλαστός (plastos) meaning molded.[1][2] It refers to their malleability, or plasticity during manufacture, that allows them to be cast, pressed, or extruded into a variety of shapes—such as films, fibers, plates, tubes, bottles, boxes, and much more. The common word plastic should not be confused with the technical adjective plastic, which is applied to any material which undergoes a permanent change of shape (plastic deformation) when strained beyond a certain point. Aluminum which is stamped or forged, for instance, exhibits plasticity in this sense, but is not plastic in the common sense; in contrast, in their finished forms, some plastics will break before deforming and therefore are not plastic in the technical sense. There are two types of plastics: thermoplastics and thermosetting polymers. Thermoplastics are the plastics that don't undergo chemical change in their composition when heated and can be moulded again and again; examples are polyethylene, polystyrene, polyvinyl chloride and polytetrafluoroethylene (PTFE).[3] Thermosets can melt and take shape once; after they have solidified, they stay solid. The raw materials needed to make most plastics come from petroleum and natural gas.[4]

Contents
[hide]
• • • •

1 Overview 2 Chemical structure


2.1 Families

3 History 4 Types
○ ○ ○ ○ ○ ○

4.1 Cellulose-based plastics 4.2 Bakelite 4.3 Polystyrene and Polyvinyl Chloride 4.4 Nylon 4.5 Rubber 4.6 Synthetic rubber

• •

5 Toxicity 6 Environmental issues
○ ○ ○

6.1 Biodegradable (compostable) plastics 6.2 Bioplastics 6.3 Oxo-biodegradable

• • • • • •

7 Price, environment, and the future 8 Common plastics and uses 9 Special purpose plastics 10 See also 11 References 12 External links

[edit] Overview
Plastics can be classified by chemical structure, namely the molecular units that make up the polymer's backbone and side chains. Some important groups in these classifications are the acrylics, polyesters, silicones, polyurethanes, and halogenated plastics. Plastics can also be classified by the chemical process used in their synthesis, such as condensation, polyaddition, and cross-linking.[5] Also, most plastics can be bent, by vacuum moulding. This process can shape plastics around moulds, i.e. model cars, for instance. Other classifications are based on qualities that are relevant for manufacturing or product design. Examples of such classes are the thermoplastic and thermoset, elastomer, structural, biodegradable, and electrically conductive. Plastics can also be classified by various physical

properties, such as density, tensile strength, glass transition temperature, and resistance to various chemical products. Due to their relatively low cost, ease of manufacture, versatility, and imperviousness to water, plastics are used in an enormous and expanding range of products, from paper clips to spaceships. They have already displaced many traditional materials, such as wood; stone; horn and bone; leather; paper; metal; glass; and ceramic, in most of their former uses. The use of plastics is constrained chiefly by their organic chemistry, which seriously limits their hardness, density, and their ability to resist heat, organic solvents, oxidation, and ionizing radiation. In particular, most plastics will melt or decompose when heated to a few hundred degrees celsius.[6] While plastics can be made electrically conductive, with the conductivity of up to 80 kS/cm in stretch-oriented polyacetylene,[7][8][9][10] they are still no match for most metals like copper which have conductivities of several hundreds kS/cm. Plastics are still too expensive to replace wood, concrete and ceramic in bulky items like ordinary buildings, bridges, dams, pavement, and railroad ties.[citation needed]

[edit] Chemical structure
Common thermoplastics range from 20,000 to 500,000 amu, while thermosets are assumed to have infinite molecular weight. These chains are made up of many repeating molecular units, known as repeat units, derived from monomers; each polymer chain will have several thousand repeating units. The vast majority of plastics are composed of polymers of carbon and hydrogen alone or with oxygen, nitrogen, chlorine or sulfur in the backbone. (Some of commercial interests are silicon based.) The backbone is that part of the chain on the main "path" linking a large number of repeat units together. To customize the properties of a plastic, different molecular groups "hang" from the backbone (usually they are "hung" as part of the monomers before linking monomers together to form the polymer chain). This fine tuning of the properties of the polymer by repeating unit's molecular structure has allowed plastics to become such an indispensable part of twenty first-century world. Some plastics are partially crystalline and partially amorphous in molecular structure, giving them both a melting point (the temperature at which the attractive intermolecular forces are overcome) and one or more glass transitions (temperatures above which the extent of localized molecular flexibility is substantially increased). The so-called semi-crystalline plastics include polyethylene, polypropylene, poly (vinyl chloride), polyamides (nylons), polyesters and some polyurethanes. Many plastics are completely amorphous, such as polystyrene and its copolymers, poly (methyl methacrylate), and all thermosets.

Molded plastic food replicas on display outside a restaurant in Japan

[edit] Families
Plastics families Amorphous Semi-crystalline Ultra polymers PI, SRP, TPI, PAI, HTS PFSA, PEEK Fluoropolymers: LCP, PARA, HPN, High performance PPS, PPA PPSU, PEI, PESU, PSU polymers Other polyamides PC, PPC, COC, PMMA, ABS, PEX, PVDC, PBT, PET, POM, PA 6,6, Mid range polymers PVC Alloys UHMWPE Commodity polymers PS, PVC PP, HDPE, LDPE

[edit] History
This section requires expansion. The first human-made plastic was invented by Alexander Parkes in 1855;[11] he called this plastic Parkesine (later called celluloid). It was unveiled at the 1862 Great International Exhibition in London.[12] The development of plastics has come from the use of natural plastic materials (e.g., chewing gum, shellac) to the use of chemically modified natural materials (e.g., rubber, nitrocellulose, collagen, galalite) and finally to completely synthetic molecules (e.g., bakelite, epoxy, polyvinyl chloride, polyethylene). In 1866, Parkes formed the Parkesine Company to mass produce the material. The company, however, failed due to poor product quality as Parkes tried to reduce costs. Parkesine's successors were Xylonite, produced by Daniel Spill (an associate of Parkes), and Celluloid from John Wesley Hyatt. Parkesine was made from cellulose treated with nitric acid and a solvent. The generic name of Parkesine is pyroxylin, or Celluloid. Parkesine is often synthetic ivory. The Parkesine company ceased trading in 1868. Pictures of Parkesine are held by the Plastics Historical Society of London. There is a plaque on the wall of the site of the Parkesine Works.[13]

[edit] Types

This section may require cleanup to meet Wikipedia's quality standards. Please improve this section if you can. The talk page may contain suggestions. (June 2009)

[edit] Cellulose-based plastics
Parkes developed a synthetic replacement for ivory which he marketed under the trade name Parkesine, and which won a bronze medal at the 1862 World's fair in London. Parkesine was made from cellulose (the major component of plant cell walls) treated with nitric acid and a solvent. The output of the process (commonly known as cellulose nitrate or pyroxilin) could be dissolved in alcohol and hardened into a transparent and elastic material that could be molded when heated.[14] By incorporating pigments into the product, it could be made to resemble ivory. Bois Durci is a plastic molding material based on cellulose. It was patented in Paris by Lepage in 1855. It is made from finely ground wood flour mixed with a binder, either egg or blood albumen, or gelatine. The wood is probably either ebony or rose wood, which gives a black or brown resin. The mixture is dried and ground into a fine powder. The powder is placed in a steel mold and compressed in a powerful hydraulic press while being heated by steam. The final product has a highly polished finish imparted by the surface of the steel mold.

[edit] Bakelite
Main article: Bakelite The first so called plastic based on a synthetic polymer was made from phenol and formaldehyde, with the first viable and cheap synthesis methods invented in 1907, by Leo Hendrik Baekeland, a Belgian-born American living in New York state. Baekeland was searching for an insulating shellac to coat wires in electric motors and generators. He found that mixtures of phenol (C6H5OH) and formaldehyde (HCOH) formed a sticky mass when mixed together and heated, and the mass became extremely hard if allowed to cool. He continued his investigations and found that the material could be mixed with wood flour, asbestos, or slate dust to create "composite" materials with different properties. Most of these compositions were strong and fire resistant. The only problem was that the material tended to foam during synthesis, and the resulting product was of unacceptable quality. Baekeland built pressure vessels to force out the bubbles and provide a smooth, uniform product. He publicly announced his discovery in 1912, naming it bakelite. It was originally used for electrical and mechanical parts, finally coming into widespread use in consumer goods in the 1920s. When the Bakelite patent expired in 1930, the Catalin Corporation acquired the patent and began manufacturing Catalin plastic using a different process that allowed a wider range of coloring. Bakelite was the first true plastic. It was a purely synthetic material, not based on any material or even molecule found in nature. It was also the first thermosetting plastic. Conventional thermoplastics can be molded and then melted again, but thermoset plastics form bonds between polymers strands when cured, creating a tangled matrix that cannot be undone without destroying the plastic. Thermoset plastics are tough and temperature resistant. Bakelite was cheap, strong, and durable. It was molded into thousands of forms, such as cases for radios, telephones and clocks, and billiard balls. Phenol-based ("Phenolic") plastics have been largely replaced by cheaper and less brittle plastics, but they are still used in applications requiring their insulating and heat-resistant properties. For

example, some electronic circuit boards are made of sheets of paper or cloth impregnated with phenolic resin.

[edit] Polystyrene and Polyvinyl Chloride
Main articles: Polystyrene and PVC

Plastic piping and firestops being installed in Ontario. Certain plastic pipes can be used in some non-combustible buildings, provided they are firestopped properly and that the flame spread ratings comply with the local building code. After the First World War, improvements in chemical technology led to an explosion in new forms of plastics. Among the earliest examples in the wave of new plastics were polystyrene (PS) and polyvinyl chloride (PVC). Polystyrene is a rigid, brittle, inexpensive plastic that has been used to make plastic model kits and similar knick-knacks. It would also be the basis for one of the most popular "foamed" plastics, under the name styrene foam or Styrofoam. Foam plastics can be synthesized in an "open cell" form, in which the foam bubbles are interconnected, as in an absorbent sponge, and "closed cell", in which all the bubbles are distinct, like tiny balloons, as in gas-filled foam insulation and flotation devices. In the late 1950s, high impact styrene was introduced, which was not brittle. It finds much current use as the substance of toy figurines and novelties.

Polyvinyl Chloride (PVC, commonly called "vinyl")[15] has side chains incorporating chlorine atoms, which form strong bonds. PVC in its normal form is stiff, strong, heat and weather resistant, and is now used for making plumbing, gutters, house siding, enclosures for computers and other electronics gear. PVC can also be softened with chemical processing, and in this form it is now used for shrink-wrap, food packaging, and rain gear.

All PVC polymers are degraded by heat and light. When this happens, hydrogen chloride is released into the atmosphere and oxidation of the compound occurs.[16] Because hydrogen chloride readily combines with water vapor in the air to form hydrochloric acid,[17] polyvinyl chloride is not recommended for long-term archival storage of silver, photographic film or paper (mylar is preferable).[18]

[edit] Nylon
Main article: Nylon The real star of the plastics industry in the 1930s was polyamide (PA), far better known by its trade name nylon. Nylon was the first purely synthetic fiber, introduced by DuPont Corporation at the 1939 World's Fair in New York City. In 1927, DuPont had begun a secret development project designated Fiber66, under the direction of Harvard chemist Wallace Carothers and chemistry department director Elmer Keiser Bolton. Carothers had been hired to perform pure research, and he worked to understand the new materials' molecular structure and physical properties. He took some of the first steps in the molecular design of the materials. His work led to the discovery of synthetic nylon fiber, which was very strong but also very flexible. The first application was for bristles for toothbrushes. However, Du Pont's real target was silk, particularly silk stockings. Carothers and his team synthesized a number of different polyamides including polyamide 6.6 and 4.6, as well as polyesters.[19]

General condensation polymerization reaction for nylon

It took DuPont twelve years and US$27 million to refine nylon, and to synthesize and develop the industrial processes for bulk manufacture. With such a major investment, it was no surprise that Du Pont spared little expense to promote nylon after its introduction, creating a public sensation, or "nylon mania". Nylon mania came to an abrupt stop at the end of 1941 when the USA entered World War II. The production capacity that had been built up to produce nylon stockings, or just nylons, for American women was taken over to manufacture vast numbers of parachutes for fliers and paratroopers. After the war ended, DuPont went back to selling nylon to the public, engaging in another promotional campaign in 1946 that resulted in an even bigger craze, triggering the so called nylon riots. Subsequently polyamides 6, 10, 11, and 12 have been developed based on monomers which are ring compounds; e.g. caprolactam. Nylon 66 is a material manufactured by condensation polymerization. Nylons still remain important plastics, and not just for use in fabrics. In its bulk form it is very wear resistant, particularly if oil-impregnated, and so is used to build gears, plain bearings, and because of good heat-resistance, increasingly for under-the-hood applications in cars, and other mechanical parts.

[edit] Rubber
Natural rubber is an elastomer (an elastic hydrocarbon polymer) that was originally derived from latex, a milky colloidal suspension found in the sap of some plants. It is useful directly in this form (indeed, the first appearance of rubber in Europe is cloth waterproofed with unvulcanized latex from Brazil) but, later, in 1839, Charles Goodyear invented vulcanized rubber; this a form of natural rubber heated with, mostly, sulfur forming cross-links between polymer chains (vulcanization), improving elasticity and durability.

[edit] Synthetic rubber
Main article: Synthetic rubber The first fully synthetic rubber was synthesized by Sergei Lebedev in 1910. In World War II, supply blockades of natural rubber from South East Asia caused a boom in development of synthetic rubber, notably styrene-butadiene rubber. In 1941, annual production of synthetic rubber in the U.S. was only 231 tonnes which increased to 840,000 tonnes in 1945. In the space race and nuclear arms race, Caltech researchers experimented with using synthetic rubbers for solid fuel for rockets. Ultimately, all large military rockets and missiles would use synthetic rubber based solid fuels, and they would also play a significant part in the civilian space effort.

[edit] Toxicity
Due to their insolubility in water and relative chemical inertness, pure plastics generally have low toxicity in their finished state, and will pass through the digestive system with no ill effect (other than mechanical damage or obstruction). However, plastics often contain a variety of toxic additives. For example, plasticizers like adipates and phthalates are often added to brittle plastics like polyvinyl chloride (PVC) to make them pliable enough for use in food packaging, toys and teethers, tubing, shower curtains and other items. Traces of these chemicals can leach out of the plastic when it comes into contact with food. Out of these concerns, the European Union has banned the use of DEHP (di-2-ethylhexyl phthalate), the most widely used plasticizer in PVC. Some compounds leaching from polystyrene food containers have been found to interfere with hormone functions and are suspected human carcinogens.[20]

Moreover, while the finished plastic may be non-toxic, the monomers used in its manufacture may be toxic; and small amounts of those chemicals may remain trapped in the product. The World Health Organization's International Agency for Research on Cancer (IARC) has recognized the chemical used to make PVC, vinyl chloride, as a known human carcinogen.[20] Some polymers may also decompose into the monomers or other toxic substances when heated. The primary building block of polycarbonates, bisphenol A (BPA), is an estrogen-like endocrine disruptor that may leach into food.[20] Research in Environmental Health Perspectives finds that BPA leached from the lining of tin cans, dental sealants and polycarbonate bottles can increase body weight of lab animals' offspring.[21] A more recent animal study suggests that even lowlevel exposure to BPA results in insulin resistance, which can lead to inflammation and heart disease.[22] As of January 2010, the LA Times newspaper reports that the United States FDA is spending $30 million to investigate suspicious indications of BPA being linked to cancer.[23] Bis(2-ethylhexyl) adipate, present in plastic wrap based on PVC, is also of concern, as are the volatile organic compounds present in new car smell. The European Union has a permanent ban on the use of phthalates in toys. In 2009, the United States government banned certain types of phthalates commonly used in plastic.[24]

[edit] Environmental issues
Further information: Marine debris Plastics are durable and degrade very slowly; the molecular bonds that make plastic so durable make it equally resistant to natural processes of degradation. Since the 1950s, one billion tons of plastic have been discarded and may persist for hundreds or even thousands of years.[25] In some cases, burning plastic can release toxic fumes. Burning the plastic polyvinyl chloride (PVC) may create dioxin.[26] Also, the manufacturing of plastics often creates large quantities of chemical pollutants. Prior to the ban on the use of CFCs in extrusion of polystyrene (and general use, except in lifecritical fire suppression systems; see Montreal Protocol), the production of polystyrene contributed to the depletion of the ozone layer; however, non-CFCs are currently used in the extrusion process. By 1995, plastic recycling programs were common in the United States and elsewhere. Thermoplastics can be remelted and reused, and thermoset plastics can be ground up and used as filler, though the purity of the material tends to degrade with each reuse cycle. There are methods by which plastics can be broken back down to a feedstock state. Plastic can be converted as a fuel. Plastic is made from crude, so it can be broken down to liquid hydrocarbon. One kilogram of waste plastic produces a liter of hydrocarbon. Plastic wastes are used in cement plants as a fuel.[27][28][29] To assist recycling of disposable items, the Plastic Bottle Institute of the Society of the Plastics Industry devised a now-familiar scheme to mark plastic bottles by plastic type. A plastic container using this scheme is marked with a triangle of three "chasing arrows", which encloses a number giving the plastic type:

Plastics type marks: the resin identification code
1. PET (PETE), polyethylene terephthalate 2. HDPE, high-density polyethylene 3. PVC, polyvinyl chloride 4. LDPE, low-density polyethylene, 5. PP, polypropylene 6. PS, polystyrene 7. Other types of plastics (see list, below)

Unfortunately, recycling of plastics has proven to be a difficult process. The biggest problem is that it is difficult to automate the sorting of plastic wastes, making it labor intensive. Typically, workers sort the plastic by looking at the resin identification code, although common containers like soda bottles can be sorted from memory. Typically, the caps for PETE bottles are made from a different kind of plastic which is not recyclable, which presents additional problems to the automated sorting process. Other recyclable materials such as metals are easier to process mechanically. However, new processes of mechanical sorting are being developed to increase capacity and efficiency of plastic recycling. While containers are usually made from a single type and color of plastic, making them relatively easy to be sorted, a consumer product like a cellular phone may have many small parts consisting of over a dozen different types and colors of plastics. In such cases, the resources it would take to separate the plastics far exceed their value and the item is discarded. However, developments are taking place in the field of active disassembly, which may result in more consumer product components being re-used or recycled. Recycling certain types of plastics can be unprofitable, as well. For example, polystyrene is rarely recycled because it is usually not cost effective. These unrecycled wastes are typically disposed of in landfills, incinerated or used to produce electricity at waste-to-energy plants.

[edit] Biodegradable (compostable) plastics
Main article: Biodegradable plastic Research has been done on biodegradable plastics that break down with exposure to sunlight (e.g., ultra-violet radiation), water or dampness, bacteria, enzymes, wind abrasion and some instances rodent pest or insect attack are also included as forms of biodegradation or environmental degradation. It is clear some of these modes of degradation will only work if the plastic is exposed at the surface, while other modes will only be effective if certain conditions exist in landfill or composting systems. Starch powder has been mixed with plastic as a filler to allow it to degrade more easily, but it still does not lead to complete breakdown of the plastic. Some researchers have actually genetically engineered bacteria that synthesize a completely biodegradable plastic, but this material, such as Biopol, is expensive at present.[30] The German chemical company BASF makes Ecoflex, a fully biodegradable polyester for food packaging applications.

[edit] Bioplastics
Main article: Bioplastic Some plastics can be obtained from biomass, including:
• •

from pea starch film with trigger biodegradation properties for agricultural applications (TRIGGER).[31] from biopetroleum.[32]

[edit] Oxo-biodegradable
Main article: Oxo Biodegradable Oxo-biodegradable (OBD) plastic is polyolefin plastic to which has been added very small (catalytic) amounts of metal salts. As long as the plastic has access to oxygen (as in a littered state), these additives catalyze the natural degradation process to speed it up so that the OBD plastic will degrade when subject to environmental conditions. Once degraded to a small enough particle they can interact with biological processes to produce to water, carbon dioxide and biomass. The process is shortened from hundreds of years to months for degradation and thereafter biodegradation depends on the micro-organisms in the environment. Typically this process is not fast enough to meet ASTM D6400 standards for definition as compostable plastics.

[edit] Price, environment, and the future
The biggest threat to the conventional plastics industry is most likely to be environmental concerns, including the release of toxic pollutants, greenhouse gas, litter, biodegradable and nonbiodegradable landfill impact as a result of the production and disposal of petroleum and petroleum-based plastics. Of particular concern has been the recent accumulation of enormous quantities of plastic trash in ocean gyres. For decades one of the great appeals of plastics has been their low price. Yet in recent years the cost of plastics has been rising dramatically. A major cause is the sharply rising cost of petroleum, the raw material that is chemically altered to form commercial plastics. With some observers suggesting that future oil reserves are uncertain, the price of petroleum may increase further. Therefore, alternatives are being sought. Oil shale and tar oil are alternatives for plastic production but are expensive. Scientists are seeking cheaper and better alternatives to petroleum-based plastics, and many candidates are in laboratories all over the world. One promising alternative may be fructose.[33]

[edit] Common plastics and uses

A chair made with a polypropylene seat
• • • • • • • • • • • • •

Polyester (PES) - Fibers, textiles. Polyethylene terephthalate (PET) - Carbonated drinks bottles, peanut butter jars, plastic film, microwavable packaging. Polyethylene (PE) - Wide range of inexpensive uses including supermarket bags, plastic bottles. High-density polyethylene - Detergent bottles and milk jugs. Polyvinyl chloride (PVC) - Plumbing pipes and guttering, shower curtains, window frames, flooring. Polyvinylidene chloride (PVDC) (Saran) - Food packaging. Low-density polyethylene (LDPE) - Outdoor furniture, siding, floor tiles, shower curtains, clamshell packaging. Polypropylene (PP) - Bottle caps, drinking straws, yogurt containers, appliances, car fenders (bumpers), plastic pressure pipe systems. Polystyrene (PS) - Packaging foam/"peanuts", food containers, plastic tableware, disposable cups, plates, cutlery, CD and cassette boxes. High impact polystyrene (HIPS) -: Refrigerator liners, food packaging, vending cups. Polyamides (PA) (Nylons) - Fibers, toothbrush bristles, fishing line, under-the-hood car engine moldings. Acrylonitrile butadiene styrene (ABS) - Electronic equipment cases (e.g., computer monitors, printers, keyboards), drainage pipe. Polycarbonate (PC) - Compact discs, eyeglasses, riot shields, security windows, traffic lights, lenses.



Polycarbonate/Acrylonitrile Butadiene Styrene (PC/ABS) - A blend of PC and ABS that creates a stronger plastic. Used in car interior and exterior parts, and mobile phone bodies. Polyurethanes (PU) - Cushioning foams, thermal insulation foams, surface coatings, printing rollers (Currently 6th or 7th most commonly used plastic material, for instance the most commonly used plastic found in cars).



[edit] Special purpose plastics


Melamine formaldehyde (MF) - One of the aminoplasts, and used as a multi-colorable alternative to phenolics, for instance in moldings (e.g., break-resistance alternatives to ceramic cups, plates and bowls for children) and the decorated top surface layer of the paper laminates (e.g., Formica). Plastarch material - Biodegradable and heat resistant, thermoplastic composed of modified corn starch. Phenolics (PF) or (phenol formaldehydes) - High modulus, relatively heat resistant, and excellent fire resistant polymer. Used for insulating parts in electrical fixtures, paper laminated products (e.g., Formica), thermally insulation foams. It is a thermosetting plastic, with the familiar trade name Bakelite, that can be molded by heat and pressure when mixed with a filler-like wood flour or can be cast in its unfilled liquid form or cast as foam (e.g., Oasis). Problems include the probability of moldings naturally being dark colors (red, green, brown), and as thermoset it is difficult to recycle. Polyetheretherketone (PEEK) - Strong, chemical- and heat-resistant thermoplastic, biocompatibility allows for use in medical implant applications, aerospace moldings. One of the most expensive commercial polymers. Polyetherimide (PEI) (Ultem) - A high temperature, chemically stable polymer that does not crystallize. Polylactic acid (PLA) - A biodegradable, thermoplastic found converted into a variety of aliphatic polyesters derived from lactic acid which in turn can be made by fermentation of various agricultural products such as corn starch, once made from dairy products. Polymethyl methacrylate (PMMA) - Contact lenses, glazing (best known in this form by its various trade names around the world; e.g., Perspex, Oroglas, Plexiglas), aglets, fluorescent light diffusers, rear light covers for vehicles. It forms the basis of artistic and commercial acrylic paints when suspended in water with the use of other agents. Polytetrafluoroethylene (PTFE) - Heat-resistant, low-friction coatings, used in things like non-stick surfaces for frying pans, plumber's tape and water slides. It is more commonly known as Teflon. Urea-formaldehyde (UF) - One of the aminoplasts and used as a multi-colorable alternative to phenolics. Used as a wood adhesive (for plywood, chipboard, hardboard) and electrical switch housings.

• •



• •







Types of Plastic
› Home › Types of Plastic

There exist about 50 different types of plastics. Broadly plastics can be classified into two types namely Thermosetting and Thermoplastic. The Thermosetting Plastics are those that cannot be soften again, after being exposed to heat and pressure. On the action of heat and pressure, the molecular chain of thermosetting plastics become cross-linked, due to what it forbids the slippage when pressure& heat are reapplied.

The thermoplastic are those that can be soften again and again & remade by the action of heat and pressure. On the action of heat and pressure, the molecular chain of thermoplastics undergoes change and the polymers slide past

each other, that results in the property of plasticity. Some of the different thermoplastic and thermosetting plastics are mentioned below.



Vinyl Plastics :- Vinyl plastics belong to the thermoplastic group. Vinyl plastics are the sub-polymers of vinyl derivatives. These are used in laminated safety glasses, flexible tubing, molded products etc.



Polyurethane Plastics :- Polyurethane plastics belong to the group that can be thermosetting or thermoplastic. Polyurethane is the only plastic which can be made in both rigid and flexible foams. The flexible polyurethane foam is used in mattresses, carpets, furniture etc. The rigid polyurethane foam is used in chair shells, mirror frames and many more. Due to the property of high elasticity, some polyurethane plastics are used in decorative and protective coatings. The high elasticity makes these polyurethane plastics resistant to a chemical attack.





Polyacrylics Plastics :- Polyacrylics belong to the group of thermoplastics. Polyacrylics are transparent and decorative. Polyacrylics plastics can be shaped in any form like the windshields for airplane.

Apart from these, plastics have been also divided into seven different types by the plastic industry. These seven types of plastics are :-

1. Polyethylene Terephthalate (PETE) :- PETE is one the most recycled plastic. It finds usage in various bottles
like that of soda and cooking oil, etc.

2. High Density Polyethylene (HDPE) :- HDPE is generally used in detergent bottles and in milk jugs.

3. Polyvinyl Chloride (PVC) :- PVC is commonly used in plastic pipes, furniture, water bottles, liquid detergent
jars etc.

4. Low Density Polyethylene (LDPE) :- LDPE finds its usage in dry cleaning bags, food storage containers etc.

5. Polypropylene (PP) :- PP is commonly used in bottle caps and drinking straws.

6. Polystyrene (PS) :- PS is used in cups, plastic tableware etc.

7.

Other :- This category of plastics include those plastics which are different from the six aforesaid types of plastic. These plastics are usually used in food containers and in Tupperware.

Types of plastics

[German version]

Plastics are natural/synthetic materials. They are produced by chemically modifying natural substances or are synthesized from inorganic and organic raw materials. On the basis of their physical characteristics, plastics are usually divided into thermosets, elastomers and thermoplastics. These groups differ primarily with regard to molecular structure, which is what determines their differing thermal behavior. The following Table lists the characteristics of the various types of plastics.

Type of plastic

Molecular structure

Characteristics and applications

Thermosets

Thermosets are hard and have a very tight-meshed, branched molecular structure. Curing proceeds during shaping, after which it is no longer possible to shape the material by heating. Further shaping may then only be performed by machining. Thermosets are used, for example, to make light switches. While elastomers also have a crosslinked structure, they have a looser mesh than thermosets, giving rise to a degree of elasticity. Once shaped, elastomers also cannot be reshaped by heating. Elastomers are used, for example, to produce automobile tires. Thermoplastics have a linear or branched molecular structure which determines their strength and thermal behavior; they are flexible at ordinary temperatures. At approx. 120 - 180°C, thermoplastics become a pasty/liquid mass. The service temperature range for thermoplastics is considerably lower than that for thermosets. The thermoplastics polyethylene (PE), polyvinyl chloride (PVC) and polystyrene (PS) are used, for example, in packaging applications.

Elastomers

Thermoplastics

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ABS : a terpolymer made from three monomers, acrylonitrile, butadiene and styrene. Acrylonitrile and styrene provide chemical Would you like to be resistance, butadiene adds impact resistance and makes the plastic notified when a new article suitable for furniture, computer housings etc.

is added to the Industrial- Acrylic: a hard thermoplastic made from acrylic acid or a derivative Mechanical category? of acrylic acid. Best known as a glass substitute, typically under the trade names Perspex, Lucite and Plexiglas. Email Address: Amino plastics: Plastics made from ammonia based compounds, namely urea formaldehyde and melamine formaldehyde. Your Name: Bakelite : really a trade name but frequently used as a generic name for phenol formaldehyde (phenolic). Cellophane : A Du Pont trade name for film made from regenerated wood pulp (cellulose).
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Cellulose : The fibrous matter in all plant cells, with a long chain molecular structure. The most common sources used for making plastics are cotton fibres and wood pulp Cellulose acetate: A tough thermplastic made from cellulose in the form of cotton linters, treated with acetic acid and acetic anhydride. Used for many domestic mouldings such as spectacle frames, toothbrush handles, and as transparent packaging film. Cellulose acetate butyrate: A thermoplastic made from cellulose treated with acetic and butyric acids. Transparent, opaque or coloured, with excellent moulding qualities, used where more moisture resistance and dimensional stability than cellulose acetate is required. Copolymer: A plastic made by polymerizing two monomers, eg styrene and acrylonitrile . Elastomer: A synthetic plastic with the flexible properties of rubber. Epoxy resin: A very tough thermosetting resin used as a coating, or reinforced to make mouldings or laminates. Ester : A compound produced by the reaction between an acid and an

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alcohol. GRP : Glass reinforced polyester, ie polyester resin strengthened by glass fibres, making the resin, which has no strength of its own, into a very tensile material. Widely used to build boats, furniture and cars. HIPS : High impact polystyrene LLDPE : Linear low density polyethylene, a new type of low density polythene. Melalmine : Melamine formaldehyde, a thermoset produced by reacting (triaminotriazine) with formaldehyde. A tough glossy plastic usually strengthened with a filler of wood pulp. Monomer: A simple low molecular weight compound. Polymerization links monomers together to form high molecular weight polymers. Nylon: Not one material but a group of very tough and flexible materials called polyamides. Thermoplastic and usually found as fibres or used solid, as gears, zips and more recently as dyed jewellery. Phenolic: abbreviated version of phenol - formaldehyde. Phenolic is usually reinforced with a filler, but cast phenolic has no filler and can be translucent. It can be easily coloured and is used decoratively for jewellery, radio cabinets and all kinds of ornaments. Polycarbonate : A very tough thermoplastic, usually found as a substitute for glass, eg: vandal proof telephone kiosks,bullet proof shields, baby bottles and picnicware. Polyesters : Complex ester compounds which are thermosetting and can be polymerized at room temperature, eg GRP. Polymer : Another word for a plastic material: one which has been made from chains of molecules of one or more monomers. Polymers (plastics) are organic substances, made from hundreds or thousands of molecules linked together in a repeating chain pattern (also known as macromolecules). Polymerization : The chemical process of linking monomers to form new compounds called polymers. For example,ethylene is polymerized into polyethylene, (polythene for short). Polypropylene : A thermoplastic polymerized from propene, very close to polythene in molecular structure, but harder, stronger and less flexible. Polystyrene : A brittle.water white thermoplastic polymerized from styrene - (phenylethylene). The brittleness is overcome by adding some butadiene, which results in toughened polystyrene also known as high impact polystyrene (HIPS), a copolymer of butadiene and styrene. Expanded polystyrene is the rigid white foam used for packaging.

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How to Recycle Different Types of Plastic
Adding Up the Numbers When You Recycle Plastic Products and Containers
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Plastic RecyclingBuy and sell all types Toll grinding availablewww.royalplastics.net Download Google ChromeSearching is fast and easy with Google's web browser.www.Google.com/Chrome Dear EarthTalk: What is the deal with plastics recycling these days? Can you explain what the different numbers molded onto the bottom of plastic containers stand for? – Tom Croarkin, Fairfield, CT The confusion over what we can and cannot recycle continues to confound consumers. Plastics are especially troublesome, as different types of plastic require different processing to be reformulated

and re-used as raw material. Some municipalities accept all types of plastic for recycling, while others only accept jugs, containers and bottles with certain numbers stamped on their bottoms. Recycling by the Numbers The symbol code we’re familiar with—a single digit ranging from 1 to 7 and surrounded by a triangle of arrows—was designed by The Society of the Plastics Industry (SPI) in 1988 to allow consumers and recyclers to differentiate types of plastics while providing a uniform coding system for manufacturers. The numbers, which 39 U.S. states now require to be molded or imprinted on all eight-ounce to fivegallon containers that can accept the half-inch minimum-size symbol, identify the type of plastic. According to the American Plastics Council, an industry trade group, the symbols also help recyclers do their jobs more effectively. Easy Plastics to Recycle The easiest and most common plastics to recycle are made of polyethylene terephthalate (PETE) and are assigned the number 1. Examples include soda and water bottles, medicine containers, and many other common consumer product containers. Once it has been processed by a recycling facility, PETE can become fiberfill for winter coats, sleeping bags and life jackets. It can also be used to make bean bags, rope, car bumpers, tennis ball felt, combs, cassette tapes, sails for boats, furniture and, of course, other plastic bottles. Number 2 is reserved for high-density polyethylene plastics. These include heavier containers that hold laundry detergents and bleaches as well as milk, shampoo and motor oil. Plastic labeled with the number 2 is often recycled into toys, piping, plastic lumber and rope. Like plastic designated number 1, it is widely accepted at recycling centers. Plastics Less Commonly Recycled Polyvinyl chloride, commonly used in plastic pipes, shower curtains, medical tubing, vinyl dashboards, and even some baby bottle nipples, gets number 3. Like numbers 4 (wrapping films, grocery and sandwich bags, and other containers made of low-density polyethylene) and 5 (polypropylene containers used in Tupperware, among other products), few municipal recycling centers will accept it due to its very low rate of recyclability. Another Useful Plastic to Recycle Number 6 goes on polystyrene (Styrofoam) items such as coffee cups, disposable cutlery, meat trays, packing “peanuts” and insulation. It is widely accepted because it can be reprocessed into many items, including cassette tapes and rigid foam insulation. Hardest Plastics to Recycle Last, but far from least, are items crafted from various combinations of the aforementioned plastics or from unique plastic formulations not commonly used. Usually imprinted with a number 7 or nothing at all, these plastics are the most difficult to recycle and, as such, are seldom collected or recycled. More ambitious consumers can feel free to return such items to the product manufacturers to avoid contributing to the local waste stream, and instead put the burden on the makers to recycle or dispose of the items properly.

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A Look at the Many Types of Plastics
Plastic has become increasingly important in our every day lives. With so many different types of plastics, products meeting a broad range of consumer needs are available. For the most part, plastics are organic high polymers, which means they are made of large chainlike molecules that contain carbon. These polymers are changed into a plastic state either as they transition from a small-molecule chemical to a solid, or shortly after. Basically, large chainlike molecules are created by hooking together short-chain molecules. The precise process used to created this change, however, results in different types of plastics. Thermoplastics Versus Thermosets Plastic materials are divided into two basic groups: thermoplatics and thermosets. Thermoplastic materials are made of long molecules with side chains or with groups that are not attached to the other molecules. As a result, thermoplastics can be repeatedly melted and solidified through heating and cooling without a chemical change taking place. This means scraps created when processing thermoplastics can be reused. Thermoplastics are generally supplied to manufacturers in pellet form in order to be melted down and used. Thermosets, however, cannot be reprocessed because they form crosslinked structures during processing. Scrap created when thermoset plastics are processed, therefore, must be discarded or used as a filler in other products. Thermoset plastics are supplied to manufacturers in liquid form or a solid molding powder that has been partially polymerized. They can be formed into their desired shape with or without pressure and heat or chemicals can be used to polymerize them. Oddly enough, the line is not clearly drawn between thermoplastics and thermosets. In fact, some types of plastic are made as a combination of the two.
Types of Plastics Plastics starting with the letter: A | C, D and E | F, M and N | P | S, T and U

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Plastic recycling
From Wikipedia, the free encyclopedia

Jump to: navigation, search Plastic recycling is the process of recovering scrap or waste plastics and reprocessing the material into useful products, sometimes completely different in form from their original state. For instance, this could mean melting down soft drink bottles and then casting them as plastic chairs and tables. Typically a plastic is not recycled into the same type of plastic, and products made from recycled plastics are often not recyclable.[citation needed]

Contents
[hide]
• •

1 Challenges 2 Processes
○ ○ ○ ○

2.1 Monomer recycling 2.2 Thermal depolymerization 2.3 Heat compression 2.4 Other processes 3.1 PET 3.2 PVC 3.3 HDPE 3.4 Other plastics



3 Applications
○ ○ ○ ○

• • •

4 Financial justification 5 Recycling rates 6 Consumer education
○ ○

6.1 United States 6.2 United Kingdom

• • • •

7 Plastic identification code 8 See also 9 References 10 External links

[edit] Challenges
When compared to other materials like glass and metal materials, plastic polymers require greater processing to be recycled.[citation needed] Plastics have a low entropy of mixing, which is due to the high molecular weight of their large polymer chains. A macromolecule interacts with its environment along its entire length, so its enthalpy of mixing is large compared to that of an organic molecule with a similar structure. Heating alone is not enough to dissolve such a large molecule; because of this, plastics must often be of nearly identical composition in order to mix efficiently. When different types of plastics are melted together they tend to phase-separate, like oil and water, and set in these layers. The phase boundaries cause structural weakness in the resulting material, meaning that polymer blends are only useful in limited applications. Another barrier to recycling is the widespread use of dyes, fillers, and other additives in plastics. The polymer is generally too viscous to economically remove fillers, and would be damaged by many of the processes that could cheaply remove the added dyes. Additives are less widely used in beverage containers and plastic bags, allowing them to be recycled more frequently. The use of biodegradable plastics is increasing. If some of these get mixed in the other plastics for recycling, the reclaimed plastic is not recyclable because the variance in properties and melt temperatures.[1]

[edit] Processes
Before recycling, plastics are sorted according to their resin identification code, a method of categorization of polymer types, which was developed by the Society of the Plastics Industry in 1988. Polyethylene terephthalate, commonly referred to as PET, for instance, has a resin code of 1. They are also often separated by colour. The plastic recyclables are then shredded. These shredded fragments then undergo processes to eliminate impurities like paper labels. This material is melted and often extruded into the form of pellets which are then used to manufacture other products.

[edit] Monomer recycling
Many recycling challenges can be resolved by using a more elaborate monomer recycling process, in which a condensation polymer essentially undergoes the inverse of the polymerization reaction used to manufacture it. This yields the same mix of chemicals that formed the original polymer, which can be purified and used to synthesize new polymer chains of the same type. Du Pont opened a pilot plant of this type in Cape Fear, North Carolina, USA, to recycle PET by a process of methanolysis, but it closed the plant due to economic pressures.[2]

[edit] Thermal depolymerization
Main article: Depolymerization Main article: Thermal depolymerization Another process involves the conversion of assorted polymers into petroleum by a much less precise thermal depolymerization process. Such a process would be able to accept almost any polymer or mix of polymers, including thermoset materials such as vulcanized rubber tires and the biopolymers in feathers and other agricultural waste. Like natural petroleum, the chemicals produced can be made into fuels as well as polymers. A pilot plant of this type exists in

Carthage, Missouri, USA, using turkey waste as input material. Gasification is a similar process, but is not technically recycling since polymers are not likely to become the result.

[edit] Heat compression
Yet another process that is gaining ground with startup companies (especially in Australia, United States and Japan) is heat compression.[citation needed] The heat compression process takes all unsorted, cleaned plastic in all forms, from soft plastic bags to hard industrial waste, and mixes the load in tumblers (large rotating drums resembling giant clothes dryers). The most obvious benefit to this method is the fact that all plastic is recyclable, not just matching forms. However, criticism rises from the energy costs of rotating the drums, and heating the post-melt pipes.

[edit] Other processes
A process has also been developed in which many kinds of plastic can be used as a carbon source in the recycling of scrap steel.[3]

[edit] Applications
[edit] PET
Main article: PET bottle recycling Post-consumer polyethylenes are sorted into different color fractions, cleaned, and prepared for processing[4]. This sorted post-consumer PET waste is crushed, chopped into flakes, pressed into bales, and offered for sale[5]. One use for this recycled PET that has recently started to become popular is to create fabrics to be used in the clothing industry[6]. The fabrics are created by spinning the PET flakes into thread and yarn[5]. This is done just as easily as creating polyester from brand new PET[7]. The recycled PET thread or yarn can be used either alone or together with other fibers to create a very wide variety of fabrics. Traditionally these fabrics were used to create strong, durable, rough, products, such as jackets, coat, shoes, bags, hats, and accessories. However, these fabrics are usually too rough on the skin and could cause irritation. Therefore, they usually are not used on any clothing that may irritate the skin, or where comfort is required[8]. But in today's new ecofriendly world there has been more of a demand for “green” products. As a result, many clothing companies have started looking for ways to take advantage of this new market and new innovations in the use of recycled PET fabric are beginning to develop. These innovations included different ways to process the fabric[5], to use the fabric, or blend the fabric with other materials[9]. Some of the fabrics that are leading the industry in these innovations include Billabong's Eco-Supreme Suede[9], Livity's Rip-Tide III[10], Wellman Inc's Eco-fi(formerly known as EcoSpun)[4], and Reware's Rewoven[7]. Some additional companies that take pride in using recycled PET in their products are Crazy Shirts[11] and Playback[6].

[edit] PVC
PVC- or Vinyl Recycling has historically been difficult to perfect on the industrial scale.[citation needed] But within the last decade several viable methods for recycling or upcycling PVC plastic have been developed.[citation needed]

[edit] HDPE
The most-often recycled plastic[citation needed], HDPE or number 2, is downcycled into plastic lumber, tables, roadside curbs, benches, truck cargo liners, trash receptacles, stationery (e.g. rulers) and other durable plastic products and is usually in demand.

[edit] Other plastics
The white plastic foam peanuts used as packing material are often accepted by shipping stores for reuse.[12] Successful trials in Israel have shown that plastic films recovered from mixed municipal waste streams can be recycled into useful household products such as buckets.[13] Similarly, agricultural plastics such as mulch film, drip tape and silage bags are being diverted from the waste stream and successfully recycled [14] into much larger products for industrial applications such as plastic composite railroad ties.[15] Historically, these agricultural plastics have primarily been either landfilled or burned on-site in the fields of individual farms.[16] CNN reports that Dr. S. Madhu of the Kerala Highway Research Institute, India has formulated a road surface that includes recycled plastic.[citation needed] Aggregate, bitumen (asphalt) with plastic that has been shredded and melted at a temperature below 220 degrees C (428 °F) to avoid pollution. This road surface is claimed to be very durable and monsoon rain resistant. The plastic is sorted by hand, which is economical in India. The test road used 60 kg of plastic for an approx. 500m long, 8m wide, two-lane road.

[edit] Financial justification
In 2008, the price of PET dropped from $370/ton in the US to $20 in November.[17]. PET prices had returned to their long term averages by May of 2009.[18]

[edit] Recycling rates
This section does not cite any references or sources.
Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (July 2009)

Plastic recycling rates lag far behind those of other items, such as newspaper (about 80%) and corrugated fiberboard (about 70%).[19] All plastic bottles were recycled at a rate of 24% in 2005.
[20][clarification needed]

The quantity of post-consumer plastics recycled has increased every year since at least 1990. In 2006 the amount of plastic bottles recycled reached a record high of 2.2 trillion pounds. The amount of PET bottles recycled in 2006 increased more than 102 million pounds compared to 2005. HDPE bottle recycling increased in 2005 to 928 million pounds.

[edit] Consumer education
[edit] United States
Low national plastic recycling rates have been due to the complexity of sorting and processing, unfavorable economics, and consumer confusion about which plastics can actually be recycled. [21] Part of the confusion has been due to the recycling symbol that is usually on all plastic items[citation needed]. This symbol is called a resin identification code. It is stamped or printed on the bottom of containers and surrounded by a triangle of arrows. (See the table in Plastic.) The intent of these arrows was to make it easier to identify plastics for recycling. The recycling symbol doesn’t necessarily mean that the item will be accepted by residential recycling programs.[22]

[edit] United Kingdom

In the UK, the amount of post-consumer plastic being recycled is relatively low[23], due in part to a lack of recycling facilities. The Plastics 2020 Challenge was founded in 2009 by the plastics industry with the aim of engaging the British public in a nationwide debate about the use, reuse and disposal of plastics, hosts a series of online debates on its website framed around the waste hierarchy.

[edit] Plastic identification code
Main article: Resin identification code Seven groups of plastic polymers,[24] each with specific properties, are used worldwide for packaging applications (see table below). Each group of plastic polymer can be identified by its Plastic Identification code (PIC) - usually a number or a letter abbreviation. For instance, LowDensity Polyethylene can be identified by the number 4 and/or the letters "LDPE". The PIC appears inside a three-chasing arrow recycling symbol. The symbol is used to indicate whether the plastic can be recycled into new products. The PIC was introduced by the Society of the Plastics Industry, Inc. which provides a uniform system for the identification of different polymer types and helps recycling companies to separate different plastics for reprocessing. Manufacturers of plastic products are required to use PIC labels in some countries/regions [25] and can voluntarily mark their products with the PIC where there are no requirements. Consumers can identify the plastic types based on the codes usually found at the base or at the side of the plastic products, including food/chemical packaging and containers. The PIC is usually not present on packaging films, as it is not practical to collect and recycle most of this type of waste. Plastic Identification Code Type of plastic polymer Properties Common Packaging Applications

Polyethylene terephthalate (PET, PETE)

Clarity, strength, Soft drink, water and salad dressing toughness, barrier to bottles; peanut butter and jam jars gas and moisture.

High-density polyethylene (HDPE)

Stiffness, strength, Water pipes, Hula-Hoop (children's toughness, resistance game) rings, Milk, juice and water to moisture, bottles; the occasional shampoo / permeability to gas. toiletry bottle Blister packaging for non-food items; cling films for non-food use. Not used for food packaging as the plasticisers needed to make natively rigid PVC flexible are usually toxic. Nonpackaging uses are electrical cable insulation; rigid piping; vinyl records.

Polyvinyl chloride (PVC)

Versatility, ease of blending, strength, toughness.

Low-density polyethylene (LDPE)

Ease of processing, strength, toughness, Frozen food bags; squeezable bottles, flexibility, ease of e.g. honey, mustard; cling films; flexible sealing, barrier to container lids. moisture. Strength, toughness, resistance to heat, chemicals, grease and oil, versatile, barrier to moisture. Reusable microwaveable ware; kitchenware; yogurt containers; margarine tubs; microwaveable disposable take-away containers; disposable cups; plates. Egg cartons; packing peanuts; disposable cups, plates, trays and cutlery; disposable take-away containers;

Polypropylene (PP)

Versatility, clarity, Polystyrene (PS) easily formed

Dependent on Other (often polymers or polycarbonate or combination of ABS) polymers

Beverage bottles; baby milk bottles. Non-packaging uses for polycarbonate: compact discs; "unbreakable" glazing; electronic apparatus housings.

[edit] See also
• • • • • • •

272 Types Of Plastics And Plastic Compounds With Their Chemical Codes Reuse of water bottles Bisphenol_A#Identification_in_plastics, an article on "BPA", esp. relevant to types 3 & 7 plastics. Plastics 2020 Challenge Baler Microplastics Post-consumer resin sterilization

[edit] References
1. ^ [1][dead link] 2. ^ "DUPONT ENDS RECYCLING EXPERIMENT. | Chemicals > Chemicals Overview from".
AllBusiness.com. http://www.allbusiness.com/chemicals/chemicals-overview/9060603-1.html. Retrieved 2010-08-21.

3. ^ Steel CNN. Retrieved 9.11.06. 4. ^ a b "EcoSpun (Eco-fi) Clothing - Eartheasy.com Solutions for Sustainable Living". Eartheasy.com.
http://www.eartheasy.com/wear_ecospun.htm. Retrieved 2010-08-21.

5. ^ a b c Idea TV GmbH. "Recycled plastic - the fashion fabric of the future". Innovations-report.com.
http://www.innovations-report.com/html/reports/environment_sciences/report-7183.html. Retrieved 201008-21.

6. ^ a b 10:24 AM PT, November 13, 2009 (2009-11-13). "Trashy Chic: Recycled clothing from Playback Brand X". Thisisbrandx.com. http://www.thisisbrandx.com/2009/11/trashy-chic-recycled-clothing-fromplayback.html. Retrieved 2010-08-21.

7. ^ a b "Reware's REWOVEN Technology Info: The Eco Narrative - Recycled PET". Rewarestore.com.
http://www.rewarestore.com/tech_recycled_pet.html. Retrieved 2010-08-21.

8. ^ "Billabong ECO Supreme Suede Boardshorts: Sustainable is Good Eco Products".
Sustainableisgood.com. 2008-04-09. http://www.sustainableisgood.com/products/2008/04/billabong.html. Retrieved 2010-08-21.

9. ^ a b [2][dead link] 10. ^ "Rip-Tide "Eco Tech" Fabric Made From Hemp, Recycled PET". TreeHugger.
http://www.treehugger.com/files/2008/03/rip-tide-livity.php. Retrieved 2010-08-21.

11. ^ September 3, 2009 (2009-09-03). "Eco Friendly Recycled Board Shorts". Gogreenstreet.com.
http://www.gogreenstreet.com/eco-friendly-recycled-plastic-bottle-board-shorts/. Retrieved 2010-08-21.

12. ^ "Let Peanuts Live! Mail Boxes Etc. Recycles as Part ofNational Effort; Recycle Loose-fill, Foam
`Peanuts' AtParticipating Mail Boxes Etc. Locations. | North America > United States from". AllBusiness.com. http://www.allbusiness.com/consumer-products/office-supplies-equipment/69161301.html. Retrieved 2010-08-21.

13. ^ Plastic trial procedure Oaktech Environmental website. Retrieved 9.11.06. 14. ^ Agricultural plastics recycling process Agricultural plastics recycling website. Retrieved 07.11.08. 15. ^ Plastic Composite Railroad Tie Facts Plastic Composite Railroad Ties website. Retrieved 01.21.08. 16. ^ Recycling Used Agricultural Plastics James W. Garthe, Paula D. Kowal, PennState University,
Agricultural and Biological Engineering

17. ^ Page, Candace, Waste district raises recycling fees, Burlington Free Press, November 12, 2008 18. ^ Financial Times, May 15, 2009 (article by Max Hogg) 19. ^ The Self-Sufficiency Handbook: A Complete Guide to Greener Living by Alan Bridgewater pg. 62-Skyhorse Publishing Inc., 2007 ISBN 1602391637, 9781602391635

20. ^ http://www.headwatersrecycle.com/why.html 21. ^ Watson, Tom (June 2, 2007). "Where can we put all those plastics?". Seattle Times.
http://seattletimes.nwsource.com/html/homegarden/2003730398_ecoconsumer02.html. Retrieved 2007-0602.

22. ^ Where can we put all those plastics? By Tom Watson June 2, 2007 Seattle Times
http://seattletimes.nwsource.com/html/homegarden/2003730398_ecoconsumer02.html

23. ^ Plastics wasteonline.org.uk. Retrieved 10.18.07. 24. ^ "Safe Use Of Plastic Food Packaging And Containers".
http://www.ava.gov.sg/FoodSector/FoodSafetyEducation/Food+Facts/SafeUsePlasticContainers/index.htm.

25. ^ "19". Holt Chemistry (Florida edition). Holt, Rinehart, and Winston. 2006. p. 702. ISBN 0-03-039114-8.
"More than hlf the states in the United States have enacted laws that require plastic products to be labeled with numerical codes that identify the type of plastic used in them."

[edit] External links


West, Larry. "Recyclable Plastic: Why are So Few Food Containers Made of Recyclable Plastic?". About.com.

http://environment.about.com/od/reducingwaste/a/corn_plastic.htm. Retrieved 2009-0504.
• • • •

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i v e s i n c l . P H C ' s H e a l t h Teratogen · Carcinogen · Endocrine disruptor · Diabetes · Obesity i s s u e s M i s c PVC · Plastic recycling · Plastic bottle · Vinyl chloride · Dioxins · Polystyrene · e Styrofoam · PTFE (Teflon) · California Proposition 65 · List of environmental health l hazards · Persistent organic pollutant · European REACH regulation · Japan Toxic l Substances Law · Toxic Substances Control Act a n e a Retrieved from "http://en.wikipedia.org/wiki/Plastic_recycling" Categories: Plastic recycling Hidden categories: All articles with dead external links | Articles with dead external links from August 2010 | All articles with unsourced statements | Articles with unsourced statements from December 2010 | Articles with unsourced statements from August 2008 | Articles with unsourced statements from August 2010 | Articles with unsourced statements from July 2008 | Articles

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Plastic bottle
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A PET bottle A plastic bottle is a bottle constructed of plastic, with a neck that is narrower than its body and an opening at the top. The mouth of the bottle is normally sealed with a plastic bottle cap.[1] Plastic bottles are typically used to store liquids such as water, soft drinks, motor oil, cooking oil, medicine, shampoo, milk, and ink. The size ranges from very small sample bottles to large carboys. This article provides a description of common plastic container resin materials, their qualities, usages, and limitations.

Contents
[hide]
• • • • • • •

1 History 2 Construction 3 Health and environmental issues 4 Labeling 5 See also 6 References 7 External links

[edit] History
Leonardo Da Vinci invented the first form of natural plastic during the Renaissance period.[2] The plastic Da Vinci created was made from both animal and vegetable glues combined with organic fibers.[2] When this combination dried Da Vinci was left with a product that would be described today as a plastic-like substance.[2] In 1862, Alexander Parkes was responsible for introducing the first manmade plastic at the Great International Exhibition in London.[2] This manmade plastic was nicknamed Parkesine. Due to an extremely expensive production cost of raw materials as well as the combustibility of the finished product, the product became obsolete.[2] Plastic bottles were first used commercially in 1947,[3] but remained relatively expensive until the early 1960s when high-density polyethylene was introduced.[4] They quickly became popular with both manufacturers and customers due to their lightweight nature and relatively low production costs compared with glass bottles.[5] The food industry has almost completely replaced glass in many cases with plastic bottles, but wine and beer are still commonly sold in glass bottles.

[edit] Construction

A plastic bottle cap

Plastic bottles before processing Plastic bottles are formed using a variety of techniques. The choice of material varies depending upon application. High Density Polyethylene: HDPE is the most widely used resin for plastic bottles. This material is economical, impact resistant, and provides a good moisture barrier. HDPE is compatible with a wide range of products including acids and caustics but is not compatible with

solvents. It is supplied in FDA approved food grade. HDPE is naturally translucent and flexible. The addition of color will make HDPE opaque although not glossy. HDPE lends itself readily to silk screen decoration. While HDPE provides good protection at below freezing temperatures, it cannot be used with products filled at over 160 °F (71 °C) or products requiring a hermetic (vacuum) seal. Low Density Polyethylene: LDPE is similar to HDPE in composition. It is less rigid and generally less chemically resistant than HDPE, but is more translucent. LDPE is used primarily for squeeze applications. LDPE is significantly more expensive than HDPE. Polyethylene Terephthalate: Polyethylene Terephthalate (PET, PETE or polyester) is commonly used for carbonated beverage and water bottles. PET provides very good alcohol and essential oil barrier properties, generally good chemical resistance (although acetones and ketones will attack PET) and a high degree of impact resistance and tensile strength. The orienting process serves to improve gas and moisture barrier properties and impact strength. This material does not provide resistance to high temperature applications—max. temp. 160 °F (71 °C). Polyvinyl Chloride: PVC is naturally clear, has extremely good resistance to oils, and has very low oxygen transmission. It provides an excellent barrier to most gases and its drop impact resistance is also very good. This material is chemically resistant, but it is vulnerable to solvents. PVC is an excellent choice for salad oil, mineral oil, and vinegar. It is also commonly used for shampoos and cosmetic products. PVC exhibits poor resistance to high temperatures and will distort at 160 °F (71 °C), making it incompatible with hot filled products Polypropylene: Polypropylene(PP) is used primarily for jars and closures and provides a rigid package with excellent moisture barrier. One major advantage of polypropylene is its stability at high temperatures, up to 200 °F. Polypropylene is autoclavable and offers the potential for steam sterilization. The compatibility of PP with high filling temperatures is responsible for its use with hot fill products such as pancake syrup. PP has excellent chemical resistance, but provides poor impact resistance in cold temperatures Polystyrene (PS): Styrene offers excellent clarity and stiffness at an economical cost. It is commonly used with dry products including vitamins, petroleum jellies, and spices. Styrene does not provide good barrier properties, and exhibits poor impact resistance. Fluorine Treated HDPE: Bottles are exposed to fluorine gas in a secondary operation, are similar in appearance to HDPE and have exceptional barrier properties to hydrocarbons and aromatic solvents. Fluorine treated bottles are excellent for use with insecticides, pesticides, herbicides, photographic chemicals, agricultural chemicals, household and industrial cleaners, electronic chemicals, medical cleaners and solvents, citrus products, d-limone, flavors, fragrances, essential oils, surfactants, polishes, additives, graffiti cleaning products, preemergents, stone and tile care products, waxes, paint thinner, gasoline, biodiesel, xylene, acetone, kerosene and more. For non-bottle applications, fluorination of plastic can provide compliance with state and federal regulations. An example would be fluorination plastic fuel tanks used for lawn and garden equipment, automobiles, etc. Post Consumer Resin (PCR): PCR is a blend of reclaimed natural HDPE (primarily from milk and water containers) and virgin resin. The recycled material is cleaned, ground and recompounded into uniform pellets along with prime virgin material especially designed to build up environmental stress crack resistance. PCR has no odor but exhibits a slight yellow tint in its

natural state. This tint can be hidden by the addition of color. PCR is easily processed and inexpensive. However, it cannot come into direct contact with food or pharmaceutical products. PCR can be produced in a variety of recycled content percentages up to 100%. K-Resin SBC: K-resin is ideally suited to a wide variety of packaging applications by virtue of its sparkling clarity, high gloss, and impact resistance. K-Resin, a styrene derivative, is easily processed on polyethylene equipment. It is suitable for packaging many products but is specifically incompatible with fats and unsaturated oils or solvents. This material is frequently used for display and point-of-purchase packaging.

[edit] Health and environmental issues
There is ongoing concern as to the use of plastics in consumer food packaging solutions. The environmental impact of the disposal of these products, as well as concerns regarding consumer safety, are hotly debated. See the Toxicity and Environmental issues-sections of the Plastics article.

[edit] Labeling

Resin identification code for PET Plastic bottles are marked at their base with the Resin identification code to indicate the material used:
• • • • • •

1 - PET (Polyethylene Terephthalate) 2 - HDPE (High Density Polyethylene) 3 - PVC (Polyvinyl Chloride) 4 - LDPE (Low Density Polyethylene) 5 - PP (Polypropylene) 6 - PS (Polystyrene) 7 - Other Bottle Society of the Plastics Industry


• •

[edit] See also

• • •

Recycling of PET bottles Packaging Plastics

[edit] References
1. ^ "Bottle". http://encarta.msn.com/encyclopedia_761588476/Bottle.html. Retrieved 2008-04-23. 2. ^ a b c d e "History of Plastic". http://www.sks-bottle.com/Plastic_Bottle_History.html. Retrieved 2008-10-01. 3. ^ "The Plastic Bottle". Archived from the original on 2008-04-18. http://web.archive.org/web/20080418104322/http://www.flow-eze.com/plastic_packaging.html. Retrieved 2008-04-23. 4. ^ "The History of soft drink Timeline". http://inventors.about.com/library/weekly/aa091699.htm. Retrieved 2008-04-23. 5. ^ "The history of plastic". http://www.americanchemistry.com/s_plastics/doc.asp? CID=1102&DID=4665. Retrieved 2008-04-23.

[edit] External links
Wikimedia Commons has media related to: Plastic bottles
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Plastic Bottle Materials and their Properties A guide to UPC label use on plastic bottles including printing PET Plastic Recycling Plastic Bottle Safety Frequently Asked Questions [show]v · d · ePackaging

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M a t e r i a l Adhesive · Aluminium foil · Bubble Wrap · Cellophane · Closure (container) · Corrugated s fiberboard · Cushioning · Glass · Corrugated plastic · Coated paper · Foam peanut · Hota melt adhesive · Label · Linear low-density polyethylene · Liquid packaging board · Lown density polyethylene · Metallised film · Modified atmosphere · Molded pulp · Nonwoven d fabric · Oxygen absorber · Paper · Pallet · Packaging gas · Paperboard · PET film (biaxially oriented) · Plastic wrap · Polyester · Polypropylene · Pressure sensitive tape · Screw cap · C o Shrink wrap · Slip sheet · Security seal · Security printing · Strapping · Stretch wrap · m Tinplate · Velostat p o n e n t s P r o c e s s e s

Aseptic processing · Authentication · Automatic identification and data capture · Blow molding · Calendering · Containerization · Die cutting (web) · Electronic article surveillance · Extrusion · Extrusion coating · Graphic Design · HACCP · Induction sealing · Injection molding · Molding (process) · Papermaking · Plastics extrusion · Plastic welding · Printing · Quality assurance · Radio-frequency identification · Track and trace · Vacuum forming · Ultrasonic welding · Verification and validation ·

M Barcode printer · Barcode reader · Bottling line · Cartoning machine · Check weigher · a

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E n v i r o n m e n Biodegradation · Glass recycling · Plastic recycling · Environmental engineering · t Industrial ecology · Life cycle assessment · Litter · Paper recycling · Reuse · Recycling · , Source reduction · Sustainable packaging · Waste management P o s t u s e [show]v · d · eHealth issues of plastics and Polyhalogenated compounds (PHC)'s P DIBP · DBP · BBP (BBzP) · DIHP · DEHP (DOP) · DIDP · DINP l a s t i c i z e r s : P

h t h a l a t e s M i s c e l l a n e o u s p l a s t i c i z e r s M o n o Bisphenol A (BPA, in Polycarbonates) · Vinyl chloride (in PVC) m e r s M PBDEs · PCBs · Organotins · PFCs i

Organophosphates · Adipates (DEHA · DOA)

s c e l l a n e o u s a d d i t i v e s i n c l . P H C ' s H e a l t h Teratogen · Carcinogen · Endocrine disruptor · Diabetes · Obesity i s s u e s

M i s c PVC · Plastic recycling · Plastic bottle · Vinyl chloride · Dioxins · Polystyrene · e Styrofoam · PTFE (Teflon) · California Proposition 65 · List of environmental health l hazards · Persistent organic pollutant · European REACH regulation · Japan Toxic l Substances Law · Toxic Substances Control Act a n e a Retrieved from "http://en.wikipedia.org/wiki/Plastic_bottle" Categories: Bottles | Materials | Plastics applications
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