Flexible polyurethane foam (FPF) is a polymer produced from the reaction of polyols and isocyanates, a chemical process pioneered in 1937. FPF is characterized by a cellular structure that allows for some degree of compression and resilience that provides a cushioning effect. Because of this property, it is a preferred material in furniture, bedding, automotive seating, athletic equipment, packaging, footwear, and carpet cushion. It also plays a valuable role in soundproofing and filtration. In all, over 1.5 billion pounds of foam are produced and used every year in the U.S. alone.

［The article is quoted from https://www.pfa.org/what-is-polyurethane-foam/ ］

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