... ,no harmful for health. Pingxiang Petrochemical Filteration material of ceramic sand are made of refined pottery clays added with certain modifiers ... ,porous,red&brown Diameter,mm0.5-30Apparent Density,g/cm31.2-1.6Bulk density,g/cm30.6-1.2Total porosity,% 60 ... -80Specific surface area,cm2/g5000-10000Abrasion,%≤2Uneven coefficientK80=1.2-1.5Even coefficientK80=1.0-1.3Solubility in acid,%≤2Solubility ...