https://www.sanpingmachinery.com/products/brt-back-up-ring/
PTFE backup ring seal series materials are: PTFE-polytetrafluoroethylene material and copper powder polytetrafluoroethylene.
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https://www.sanpingmachinery.com/products/brt-back-up-ring/
PTFE backup ring seal series materials are: PTFE-polytetrafluoroethylene material and copper powder polytetrafluoroethylene.