Derived from grinding natural carbonate minerals like calcite, marble, and limestone, Heavy calcium carbonate is a go-to powdered inorganic filler in multiple industries. It delivers core advantages: high chemical purity, strong inertness, chemical reaction resistance, stable thermal performance (no decomposition under 400℃), plus high whiteness, low oil absorption, low refractive index, soft texture, no crystal water, low hardness (minimal abrasion), non-toxicity, odorlessness, and great dispersibility. This makes it widely used in rubber, plastics, paints, water-based coatings, papermaking, concrete, and fireproof ceiling materials.