... ,Dustproof 3Under high wear and pressure 4.OME welcom silicon O ring Features:1) AS-568, PG standard and non-standard Silicone ... O-rings 2) Various colors available, such as black, green, yellow, ... , viton(FKM), neoprene, HNBR, NBR+PVC, NBR, natural rubber, SBR, IR, IIR(butyl rubber), CR (neoprene), EPDM, SBR, AU, ACM, CO; wide ...