... ,SBR,IIR,HNBR,ACM,FLS,AFLAS ,PU ,etc2. Application:cars,Bath,Gate,Hydropneumatic,Electronics,Powertools,Fire ,extinguishers ,Refrigeration Compressor in air ... . Y-Ring.U-Ring., Oil Seal,PU oil seals , rubber flat washers, rubber Circles, Gaskets, engine parts and accessories,compression mold , etc ... ,but o-ring's mold fee is free. KTW standard rubber seal