ASTM C778,C109
Natural silica sand graded to retain 98% on a No. 100 (150µ) sieve, 75% on a No. 50 (300µ) ,30% on a No. 40 (425µ) and, 2% on a No. 30 (600µ). Specific gravity is 2.65. Supplied in 50 lbs. (22.7kg) boxes.