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PTFE and ACM bond together. In order to improve the dustproof effect, dustproof lip is designed made of felt or non-woven fabrics. Now the 4 PTFE材料與ACM橡膠採用粘接式。爲提高防塵傚果，防塵脣可採用毛氈或無紡佈。現在已經開發到第4代産品。