the slide ring are PTFE+bronze orPTFE+CARBON. the O-ring provide elasticity, complement the PTFE of friction, working temperature: -50~250°C,working pressure 0~40MP , working temperature: -50~250°C.some used in military machinery, some used in aviation.
piston seal
It is used for sealing of piston in reciprocating high pressure oil cylinder, can seal two-way, It is compoised of filled low-friction PTFE ring and O-ring, the O-ring material are NBR or viton.
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