1.made from natural crystal stone 2.high content of SiO2 3.low impurity Quartz sand / silica powder is mainly applied to the industries of glass, water treatment filtration, exact foundry, refractory, ceramic, casting, printing, dyeing, quartz melting, petroleum, chemical, abrasive, etc.we can supply different sizes quartz grain,welcome to contact us for the further details. High-pure crystal ...