Good acid and alkali resistivity, chemical stability,heat resistivity, non-inflammability and excellent insulation. SiO2 44.30%Al2O3 31.21%Fe2O3 5.74%CaO 0.57%MgO 0.62%K2O 10.58%Na2O 1.17%LOI 4.97%It has an increasingly widespread application in domestic and overseas markets for substituing asbestos products in the building material industry, estinguishment,welding electrode, plastics, rubber, ...