1) " Plastic" -- As it applies to Plastic Lens The term "plastics" covers a range of synthetic or semi-synthetic organic condensation or polymerization products that can be molded or extruded into objects or films or fibers. Their name isderived from the fact that in their semi-liquid state they are malleable, or have the property of plasticity. Plastics vary immensely in heat tolerance,hardness, and resiliency. Combined with this adaptability, the general uniformity of composition and lightness of plasticsensures their use in almost all industrial applications today."Plastic" may also refer to any material charicterized by deformation or failure under shear stress - see Plasticity(physics) and ductile. Contents 1 Natural polymers 2 Cellulose based plastics: celluloid andrayon 3 Bakelite (phenolic) 4 Polystyrene and PVC 5 Nylon 6 Synthetic rubber 7 Plastics explosion: acrylic, polyethylene,etc 8 The environment 9 Price and the future 10 Common plastics and their typical uses 11 Special purpose plastics 12 See also 13 Quote 14 External links Natural polymers Plastics are polymers : long-chain of carbon - or silicon -based molecules. These chains are made up ofrepeating fundamental molecular elements, or "monomers". People have been using artificial organic polymers for centuries in the form of waxes and shellacs. A plant polymer named" cellulose " provides the structural strength for natural fibers and ropes, and by theearly 19th century natural rubber, tapped from rubber trees, was in widespread use. Eventually, inventors learned to improve the properties of natural polymers. Natural rubber was sensitive to temperature,becoming sticky and smelly in hot weather and brittle in cold weather. In 1834, two inventors, Friedrich Ludersdorf ofGermany and NathanielHayward of the US, independently discovered that adding sulfur to raw rubber helped prevent the material fro...
2) " Lens" -- As it applies to Plastic Lens A lens is: a part of the eye an optical device that may be used in a camera or in a telescope ; see lens(optics).the genus of the lentil a science-fictional alien device in E. E. Smith 's Lensman series, which gives its bearer telepathic and other abilities. There are also places called Lens: Lens, Pas-de-Calais, France Lens, Belgium Lens, Valais, Switzerland as well as Racing Club de Lens, a football club from the French city listed above. ...
Additional Information for Plastic Lens
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