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injection molding , or structural rim. starting in the early s, water-blown microcellular flexible foams were used to mold gaskets for automotive panels and air-filter seals, replacing pvc polymers. polyurethane foams have gained popularity in the automotive realm, and are now used in high-temperature oil-filter
insulation. specialty polyols include polycarbonate polyols, polycaprolactone polyols, polybutadiene polyols, and polysulfide polyols. the materials are used in elastomer, sealant, and adhesive applications that require superior weatherability, and resistance to chemical and environmental attack. natural oil...
https://en.wikipedia.org/wiki/Polyurethane