... than 2% of semitransparent and/or whitish crystals SIZES (US mesh - stock items): 60/80, 80/100, 100/120, 120/140 ... , 325/400, 400/500SIZES (microns - stock items): 2-4, 4-8, 8-12, 10-14, 14-20, 15-25, 20-30, 22 ... -2800 times Mechanical Compression Strength (120/140 Mesh): 8-10 NewtonsMechanical Abrasion Resistance (120/140 Mesh): 84-90%Density: 1.63 - 1.70 ...