... professional manufacture 2.ISO9001:2008 3.size:3,6,10,13,19,25,38,50mm 3,6,10,13,19,25, ... Chemical composition Al2O3+SiO2Al2O3SiO2Fe2O3MgOK2O+Na2O+CaOOther> 92%23-26%68-73%<1%<2.5%<4%<0.5% ... ) 1.35-1.4Specific gravity (g/cm3)2.3-2.4Free volume (%)40Operation temp.(max) (°C)1100Moh ... ’s hardness (scale)>6.5Acid resistance (%)>99.6Alkali resistance (%)>85 Size available & ...