... highly regarded as an excellent substitute for chromite sand and zircon sand in the produce and use, environmentally friendly ... casting material for precision casting, coated sand and self hardening sand etc.Specification OriginChina (mainland)Grain shapeRound ... -2.05g/cm 3SizeAFS20, 25, 30, 35, 40, 50, 60, 75, 80, 100, 125, 140, or ... ≤10≤525-35AFS:40≤50-2020-4020-4010-30≤10≤235-45AFS:50≤3≤1525-4025-4510 ...