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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材料与ACM橡胶采用粘接式。为提高防尘效果，防尘唇可采用毛毡或无纺布。现在已经开发到第4代产品。