日韩精品久久久毛片一区二区,国产第一福利精品导航,亚洲欧美日韩国产色另类,99久久综合狠狠综合久久aⅴ,色www永久高清,欧美精品一区二区三区中文字幕 ,国产精品亚洲第一区广西莫菁,国产青青草视频,极品美女久久久久久久久久久,国产在线欧美日韩一区二区

Silicone resin microsphere (polymethylsilsesquioxane) is a spherical structure polysiloxane made by hydrolysis condensation and other processes, with the characteristics of insoluble and non-melting, and good thermal stability. It can improve good smoothness and light diffusion, and can be applied to personal care, plastics, glass fibers, leather and other fields.