... for pain , rubber, paper , PVC , plastic , masterbach,vvvProduct : PRECIPITATED CALCIUM CARBONATE : MD 400 CHEMICAL ANALYSIS Calcium Carbonate> 99 %SiO2=0,11 %Al2O3=0.05 %MgO ... .3 %PARTICLE DISTRIBUTION Average size:3 MicronPassing 325 mesh:100% Calcium Carbonate