... (FKM)&Dow elastomers,Neoprene,HNBR,Natural rubber,SBR,IR,IIR(butyl rubber),ACM ect.NSF an KTW approved ... to cut bonding washer molds by ourself.7)Nitrile rubber is more resistant to oils and acids compared ... to natural rubber but is not as strong or flexible.8 ... shock Our factory is a professional manufacturer of rubber products ,you can get much more information from ...