... O ring is one of the main products in our factory, it is made from Nitrile(NBR), HNBR ,EPDM, Silicone, ... Fluorine(FKM,FPM), Neoprene(CR),Styrene(SBR) ,CR,ACM,PU etc.Application: O ring is widely used ... gaskets,custom rubber parts.Material Nitrile(NBR), HNBR, EPDM,Silicone, Fluorocarbon, SBR, Neoprene(CR),Butyl(IIR),NR,PU etc ... free contact with us Blue color soft silicone o ring