Technical Parameter: CaCO3%: More than 96 PH: 8.0-10.0 105C volatitle, %: Less than 1.0 Settling value, ml/g: More than 2.2 Fe, %: Less than 0.1 Mn, %: Less than 0.01 Screenings: 125um%: Less than 0.015 Whiteness(R457): More than 94 Moisture content%: Less than 0.6 Average grain size, um: 1.5-3.5 Insoluble substance in hydrochloric acid, %: Less than 0.3 Usage: Fillers of paint, print ink, plastic, adhesives, pharmacy, fodder, paper-making, PVC, PP, PE, ABS, building material.