NBR o ring 1:Material: NBR rubber 2: For example, air blower, water pump, instrument, measuring of ... : 1. Main materialNitrile rubber(NBR), also can use Natural rubber,Styrene-butadiene rubber,Butyl rubber,PU,EPDM,Neoprene, Silicone rubber, Fluorocarbon, Chlorohydrine rubber and Methacrylate rubber, etc.2. CertificationISO ...