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High Quality Chemical and Mechanical High Pressure PTFE Single Lip Oil Seal. The sealing lip is made of pure PTFE, carbon fiber filled PTFE or glass fiber modified PTFE, eliminating the inherent defects of ordinary rubber materials. The outer shell is integrally stamped from 304/316L stainless steel, featuring corrosion resistance, deformation resistance and high structural strength. Built-in auxiliary static seal made of fluororubber enhances static sealing performance. There are no easily aging plastic parts overall, greatly extending service life.