Purity standard of quartz sand for glass making
The appearance of glass sand is in the form of fine and irregular particles. Glass sand is mainly used for decoration of glass surfaces, such as glasses, lampshades, vases, etc.
Silica Purity of Glass Sand
Glass sand is the main raw material for making glass. Its particle size specification can refer to the standards of the American Ceramic Society, and its composition has different specifications depending on the type of finished product. For the highest purity optical glass, the silicon dioxide content of silica sand must be greater than 99.8%, while the content of aluminum oxide and iron oxide must be less than 0.1% and 0.02% respectively.
Advanced quartz sand: Chemical composition: sio2≥99.5%; fe2o3≤0.018%; cr2o3≤0.00016%; al2o3≤0.22%. Particle size composition: 20 mesh to 120 mesh, 40 mesh to 80 mesh; 60 mesh to 120 mesh; 60 mesh to 140 mesh; 80 mesh to 150 mesh.
Ordinary quartz sand: Chemical composition: sio2≥99.3%; fe2o3≤0.030%; cr2o3≤0.00040%; al2o3≤0.40%. Particle size composition: ranging from 20-400 mesh.
Precision casting sand: Physical and chemical standards: sio2≥99.3%; Mud content: <0.05%; Refractoriness: 1750°C. Particle size composition: ranging from 20-400 mesh.
Construction sand: Physical and chemical standards: sio2≥99.3%; mud content: <0.05%. Particle size composition: ranging from 3-30 mesh.