少妇WWWB搡BBB搡BBB,色吊丝av中文字幕,久久亚洲精品11p,无套内射极品少妇chinese

Fusible polytetrafluoroethylene (PFA) series

It has excellent heat resistance, cold resistance, chemical stability, mechanical property, insulation, self-lubricating property, folding resistance, cracking resistance and so on. A total of 22 products of injection molding, extrusion, molding three series of nine colors.