rubber o-ring: Material:NBR,silicone,,fluorin,PTFE. Working temperature: -35-+250degree Working pressure: <32Mpa rubber o-ringOur company mainly manufacture rubber o-ring,rubber hose,rubber seal, rubber conveyor belt and other rubber products and so on.Hardness:70Shore. Including AS568, BS1516, C92, P.G. and R standard etc. Description: Material: NBR, silicon rubber, fluorin rubber, PTFE. Working ...