Si2O greater than 95%, Al2O3 less than 3%, Fe2O3 less than 0.25%, Na2O+K2O less than 1.65%, loss on ignition less than 0.45%, mud content less than 0.3%, sintering point greater than 1450°C, acid consumption less than 5ml, angular factor less than 1.2, dry sand moisture content less than 0.3%.

Sand processed by foundry sand manufacturers through multiple water washing, mud removal, intensive scrubbing, and grading for surface treatment. It features round grains, clean surface, no cracks, high SiO2 content, low dust and mud content, good permeability, high refractoriness, low acid consumption value, and low ash content. It is used in coated sand, resin sand, cold box sand, cast iron, non-ferrous metal casting, mold (core) sand for molding.