Top ceramic proppant 40/70 low density high pressure resistance, high conductivity, low acid solubility What is ceramic proppant ... be classified as followed:1. by bulk density:Light density, medium density and high density.2. by compression strength:52MPa (7500psi ... -30 mesh, 20-40 mesh, 30-50 mesh, 30-60 mesh, 40-60 mesh, 40-70 mesh, 70-140 mesh, etc. ... .08 new frac sand for shale gas 40/70 low density