Quartz sand is nearly round in grain shape and has a generally smooth surface. It is preferred for use as the bottom layer in dual media filters and also for use in single-layer filtration.
Coarse quartz gravel, i.e. grain sizes > 2 mm, is available for use as support gravel.
SiO2 | approx. 97.0 % |
Al2O3 | approx. 1.1 % |
Fe2O3 | approx. 0.3 % |
Loss on Ignition | approx. 0.2 % |
Specific density | approx. 2.65 g/cm³ |
Bulk density | approx. 1400 ā 1600 kg/m³ |
Hardness | approx. 7 Mohs |
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