rubber O ring

Synthetic rubbers - Thermosets:

Butadiene rubber (BR)
Butyl rubber (IIR)
Chlorosulfonated polyethylene (CSM)
Epichiorohydrin rubber(ECH, ECO)
Ethylene propylene diene monomer (EPDM)
Ethylene propylene rubber (EPR)
Fluoroelastomers (FKM)
Nitrile rubber (NBR)
Perfluoroelastomer (FFKM)
Polyacrylate rubber(ACM)
Polychloroprene (CR)
Polyisoprene (IR)
Polysulfide rubber (PSR)
Silicone rubber (SiR)
Styrene butadiene rubber (SBR)
Thermoplastics:

Thermoplastic elastomer (TPE) styrenics
Thermoplastic polyolefin (TPO) LDPE, HDPE, LLDPE, ULDPE
Thermoplastic polyurethane (TPU) polyether, polyester
Thermoplastic etheresterelastomers (TEEEs) copolyesters
Thermoplastic polyamide (PEBA) Polyamides
Melt Processible Rubber (MPR)
Thermoplastic Vulcanizate (TPV)