According to BIS specification (IS: 8419 - 1977), quartz grains are used to filter water. The grain size curve must match the particle diameter by 10%. The formula for the uniformity coefficient ratio is D60/D10
The material shall be of one of two forms, crystalline or amorphous, by BIS requirements (IS: 67 - 1979). The material must be in dry powder form and have a minimum SiO2 content of 98%. SiO2 should not include more lead than 0.03%.
The physical specifications of silica sand specifies that silica sand shall be fairly free from contamination like clay material, pebbles, and other extraneous matter. The sand should not contain more than 4% moisture.
The oil and gas sectors use natural silica with a high SiO2 content as well as coarse-grained silica sand with spherical particles. This silica sand is utilized by oil and gas companies as "frac sand," which is pushed into the oil-bearing strata and down oil wells to increase permeability and oil flow.
Quartz and silica sand are additionally utilized as reinforcing fillers to enhance the physical qualities of rubber. The ideal silica mineral typically has a SiO2 content of + 98% and fewer than 0.1% metallic contaminants.
Silica sand and quartz are used in the manufacture of silicon carbide grains. The sand should for this purpose contain more than 99% SiO2, less than 0.1% each of Fe2O3 and Al2O3, and no lime, magnesia,or phosphorous.
In the electrode industry, silica sand or quartz powder is employed as one of the ingredients of a welding flux mixture. The silica minerals used for this purpose should have a composition of 97.5 to 99.5% SiO2, 0.05% (maximum) Fe2O3, and 0.03% (maximum) S, with a mesh size of +100 to 200.