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Plastics
High molecular weight polymers or copolymers. The wide range in physical properties of polymeric materials allows for utilization as elastomers, fibers, adhesives, rigid castings, composites, and laminates. ASTM D883 defines a plastic as a material that contains as an essential ingredient, one or more organic polymeric substances of large molecular weight, is solid in its finished state, and, at some stage in its manufacture into finished articles, can be shaped by flow. Plastics, or more appropriately polymers, are composed primarily of carbon, hydrogen, oxygen, silicon, chlorine, fluorine, and nitrogen, in various combinations and permutations.

Plastics are grouped into two categories:
1. Thermoplastics: can be melted, cooled and remelted without destroying the physical or mechanical characteristics of the polymer. This property permits components to be molded or extruded. Thermoplastic polymers include: Chlorinated Vinyls, Fluorinated plastics, Ketone, Nitrile, Nylon, Polyamide-imide, Polyolefin, Polycarbonate, and Acrylonitrile butadiene styrene (ABS). (also see: Chlorinated Vinyls, Fluorinated Plastics, Polyolefin)

2. Thermosets: begin as a liquid or powder that through chemical reaction with a second reactant or through catalyzed polymerization result in anew product with characteristics different from either starting material. Thermoset resins include: Epoxy, Phenolic, Polyurethane, Silicone, Urea and Melamine, Polyester, Vinyl ester, Furan, Bisphenol A fumarate.