... , the proportion of 2.70-3.20, a loose density of 0.3-0.5. The refractive index of Mica ... Usage of Mica Powder Mica powder can be widely used in architecture, building materials, insulation, paint, coatings, pigments, fire, plastic, ... to 1250um is the thinnest mica powder, mainly in painting and coating. SpecificationResidue %density g/cm3 Diameter Thickness Ration >Sand content %< ...