Check valves for automotive accelerator pumps and diaphrams, valves for exhaust recirculation. In the aircraft industry, control cable attachment clips, insert grommets for signal circuit connectors and O-rings and seals. They are not direct polymers or urethanes but are derived from the reaction of polyesters or polyethers with di- or polyisocyanates to produce complex structures containing urethane linkages. They are special purpose elastomers with properties generally between rubbers and thermoplastics. The resulting product depends on the ingredients, degree of crosslinking, and method of manufacture.
All urethanes are expensive but they are strong and offer exceptional resistance to wear and oils.
Linings, diaphragms, seals and vibration damping applicaions. Chaulking and sealant applications. Common monoepoxy used in the manufacture of resins. Manufacture of epichlorohydrin is by chlorinaton of acridine or high temperature chlorination of propylene, or directrly from allyl chloride by oxidation with peracetic acid. Both homopolymers and copolymers are saturated special rubbers curable with diamines or ammonium compounds.