Sand is specially graded 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. Packed in 50 lbs. (22.7kg) bags. Meets ASTM C87, C109, C348, C359, C593, C778; AASHTO T71, T106, T185. Shipping wt. 50 lbs. (22.7kg)