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Polystyrene Polystyrene is a versatile plastic used to make a wide variety of consumer products. As a hard, solid plastic, it is often used in products that require clarity, such as food packaging and laboratory ware. When combined with various colorants, additives or other plastics, polystyrene is used to make appliances, electronics, automobile parts, toys, gardening pots and equipment and more. Polystyrene also is made into a foam material, called expanded polystyrene (EPS) or extruded polystyrene (XPS), which is valued for its insulating and cushioning properties. Foam polystyrene can be more than 95 percent air and is widely used to make home and appliance insulation, lightweight protective packaging, surfboards, foodservice and food packaging, automobile parts, roadway and roadbank stabilization systems and more. Polystyrene is made by stringing together, or polymerizing, styrene, a building-block chemical used in the manufacture of many products. Styrene also occurs naturally in

Polyethylene : Types, Uses, Properties, Application & Structure info Polyethylene  or  polythene  (abbreviated  PE ;  IUPAC  name  polyethene  or  poly(methylene) ) is the most common  plastic  in use today. It is a  linear ,  man-made ,  addition ,  homo -polymer, primarily used for  packaging  ( plastic bags ,  plastic films ,  geomembranes , containers including  bottles , etc.). As of 2017, over 100 million  tonnes  of polyethylene resins are being produced annually, accounting for 34% of the total plastics market. [5] [6] Many kinds of polyethylene are known, with most having the  chemical formula  (C 2 H 4 ) n . PE is usually a mixture of similar  polymers  of  ethylene , with various values of  n . It can be  low density  or  high density : low density polyethylene is extrudedusing high pressure (1000-5000 atm) and high temperature (520 Kelvin), while high density polyethylene is extruded using low pressure (6-7 atm) and low temperature (333-343 Kelvin). Polyethylene is usua