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foam rubber
Foam rubber (also known as cellular, sponge, or expanded rubber) 〔()〕 refers to rubber that has been manufactured with a foaming agent to create an air-filled matrix structure. Commercial foam rubbers are generally made of either polyurethane or natural latex. Latex foam rubber, used in mattresses, is well known for
==Manufacturing history==
Foam rubber was first produced in 1929 by Dunlop Rubber researcher chemist Eric Owen using whipped latex. In 1937 isocyanate based materials were first used for the formation of foam rubbers, after World War II styrene-butadiene rubber replaced many natural types of foam. Foam rubbers have been used commercially for a wide range of applications since around the 1940s. Currently, polyurethane-based foams make up over 90%, by weight, of the entire market for polyurethanes. The largest amount of polyurethane is used by these industries: construction, transportation, home furniture, noise and vibration reduction, and carpet. Construction uses 27% of polyurethane, and transportation uses 21%. Flexible foam is the leading material usage at 44% total volume, and rigid foam material at 28% of the United States market.〔Laurel Sheppard (Manufacturing history FAQs )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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