pfd090008

Stone ball&Synthetic silicas Sio2:99.8% synthetic silica9-11 6-8cm product surface mud other impurities without whiteness86 Synthetic silicas & Stone ball1.synthetic silica: 9-11 cm 6-8cm 2.smooth is good ,silicon content :99.8%3.product surface mud and other impurities without Silica is hardness which Mohs hardness is 6, with a excellent ability of fire resistance and acid resistance. melting ...