... standard, such as *ISO3601 *AS568A *DIN3771 *BS1806 Features:1) All O-Rings are made according to international standard, such as *ISO3601 ... , viton (FKM), neoprene, HNBR, NBR+PVC, NBR, natural rubber, SBR, IR, IIR (butyl rubber), CR (neoprene), EPDM, SBR, AU, ACM, CO; wide ... physical property7) Customers' designs and specifications are acceptedPacking:500pcs/bag o-rings