... 3.high crush resistance 4.16/30, 20/40, 30/50, 40/70 mesh 5.API & SPE Frac Sand 20 ... /40 1. Features:high fracture conductivity.high crush resistance.API ... & SPE Authentication.16/30, 20/40, 30/50, 40/70 mesh are available. 2. Advantage:Chinese government holding ... .80 min100 max5.0 max3 max5 max8 max10 max20-40 mesh0.9 min1.80 min100 max5.0 max3 max4 ...