We are Nhat Huy Co., Ltd, specializes in exporting Calcium carbonate in Vietnam. We are looking for long-term & stable buyer who really is interested in our product. 1. Calcium Carbonate Lumps The specification of our Calcium carbonate product as follow: CaCO3: 98.5 % Min Fe2O3: 0.015 % Max MgO: 0.02 % Max SiO2: 0.1 % Max Al2O3: 0.02 % Max Whiteness: 98% Min Brightness: 93 % Min Moisture: 0.2 % Max Oil Absorption 23.00g /100g CaCO3 PH Value: 8 ?9 Specific Gravity: 2.7g/cm3 We can supply good calcium carbonate lumps with minimum 10cm size. For further info, please feel free to contact us