Quartz has high fire resistance. Fodamon engineers concluded that in the industry, quartz sand is often divided into: ordinary quartz sand, refined quartz sand, high-purity quartz sand, fused quartz sand and silica powder.

Ordinary quartz sand:
SiO2≥90-99%, Fe2O3≤0.06-0.02%, refractoriness 1750℃, some large particles in appearance, yellow skin cysts on the surface. The particle size range is 5-220 mesh, and can be produced according to user requirements. Main applications: metallurgy, silicon carbide, glass and glass products, enamel, cast steel, water filtration, soda, chemical, spray and other industries.
Refined quartz sand:
SiO2 ≥ 99-99.5%, Fe2O3 ≤ 0.02-0.015%, high quality ores are selected and processed.
The particle size range is 5-480 mesh. It can be produced according to the user’s requirements. The appearance is white or crystalline. Main uses: advanced glass, glass products, refractories, melting stone, precision casting, grinding wheel, etc.
High purity quartz sand:
SiO2≥99.5-99.9%, Fe2O3≤0.005%, is made of 1-3 grade natural crystal stones and high-quality natural stones, carefully selected and finely processed. The particle size range is 1—0.5mm, 0.5—0.1mm, 0.1—0.01mm, 0.01—0.005mm, and can be produced according to user requirements. (mm is millimeters)
Fused silica sand: Chemical composition:
SiO2 99.9-99.95%, Fe2O3 5PPM-25PPM max Li2O 1-2PPM max Al2O3 20-30PPM max K2O 20-25PPM max Na2O 10-20PPM max (PPM is one part per million)
Physical properties:
The appearance is colorless transparent block, particle or white powder.
Relative specific gravity: 2.21;
Mohs hardness: 7.0;
PH value: 6.0;
Silicon powder
Silica powder: the appearance is gray or off-white powder, and the refractoriness is >1600°C. Bulk density: 200～250 kg/m3. The chemical composition of silicon powder is shown in the following table:
Item SiO2 Al2O3 Fe2O3 MgO CaO NaO PH
Average 75～96% 1.0±0.2% 0.9±0.3% 0.7±0.1% 0.3±0.1% 1.3±0.2% neutral

The main specifications and standards of quartz sand as below