国产一级黄片手机在线,欧美中文字幕免费在线观看,朋友们的妈妈3,国产激情三级电影在线观看

hardness PU glue to produce the dust-collecting filters

High hardness filter PU glue, is a special non-porous polyurethane elastomer. The elastic body because there is no air bubbles, the intensity is relatively large, good elasticity,permanent deformation rate is very low. Has some oil resistance and excellent fatigue resistance. Can reach maximum hardness Shore A 85.