... 4.Used in rubber ,plastic, pigment,fire proof mate 1. Appearance: white powder2. Specification: magnesium carbonate for desiccant a. MgO content 41 ... ≥ 52.054-58 3.Application: Used in the manufacture of magnesium, magnesium oxide, fireproof, paint, ink, pottery, glass,toothpaste, rubber, pigment, dately ...