a class of synthetic materials made from a polymer of urethane; used in foam form as lightweight insulation and packing, but also produced as fibres, coatings, and in a flexible form for diaphragms and seals.
a class of synthetic materials made from a polymer of urethane; used in foam form as lightweight insulation and packing, but also produced as fibres, coatings, and in a flexible form for diaphragms and seals.