... %min. Appearance: white powder. Heavy calcium carbonate, also called ground calcium carbonate, is produced by natural superior calcite, which ... , depending on your requirement.Heavy (Ground) Calcium Carbonate is widely used as filler and improver in plastic ... NO.207-439-9Molecular FormulaCaCO3typeheavy, groundApplicationHeavy (Ground) Calcium Carbonate is widely used as filler and improver in plastic ...