Top ceramic proppant 30/50 low density high pressure resistance, high conductivity, low acid solubility ... can be classified as followed:1. by bulk density:Light density, medium density and high density.2. by compression strength:52MPa (7500psi), 69MPa ... 20 mesh, 16-20 mesh, 16-30 mesh, 20-40 mesh, 30-50 mesh, 30-60 mesh, 40-60 mesh, 40- ... ChinaNo.08 hydraulic frac sand for oil and gas 30/50 low density