SiO2≥90—99％ Fe2O3≤0.06—0.02％,Refractory 1750 --- 1800 ° C, large particles in appearance, yellow skin capsules on the surface. Granularity range 1-320 mesh, can be produced according to user requirements. Main uses: metallurgy, ink silicon carbide, building materials, enamel, cast steel, filter material, soda ash, chemical industry, spraying and other industries.