... raw materials in vitamins, minerals, extracts and oils . Welcome to advise! Purity:% ≥ 98Hydrochloric acid insoluble matter% ≤ 0.20Free alkali content of qualifiedHeavy Metals ... +2 / p-2Density: 2.93Melting point: 825 °CBoiling point: for the production of cement, ceramics, lime, calcium, toothpaste, dyes, ... , catalyst, fillers, pharmaceuticals. Food grade calcium carbonate---Raw materials supply