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The pure tetrafluoroethylene disc root is woven with pure polytetrafluoroethylene fiber, and is not treated with PTFE lotion and lubricating grease. Due to its solid weaving and flexibility, it can be well matched with shafts and packing boxes with excellent corrosion resistance, good self-lubricating and anti sticking properties. It is recommended for use in chemical, food, and other non polluting operating environments, as well as in all chemical media except soluble alkali metals.