rubber o rings(mechanical seal,seat ring ) 1.R,RX.BX 2.ISO9001 ... ,316,ocr13,CS,CI,347... rubber o rings:1) Materials: different kinds of rubber and plastic, such as SILICON, NBR, SBR, NR,PU, PTFE ... , gasket rubber, O-rings4) Processing methods: compression, injection, transfer, inserting molding, extrusion and blowing Packing: According to customers' requirements silicone rubber O Rings