... , wire ,cable and so on. Mica Powder Fineness of Mica powder :800 mesh ,1500mesh ,3000 mesh .Mica mostly crystallize into monoclinic system ,crystal ... .hardness 2-3 ,specific gravity 2.70-3.20. mica powder have special acid-base resistance , chemical stability, also have ... , the most is muscovite(white mica) ,secondly is phlogopite, Use 1. the superfine mica powder is the fuctional filler of plastic ...