... Proppant is divided into 52Mpa, 69Mpa, 86Mpa,and 103Mpa three series, according to bulk density, ... mesh, 12-20 mesh, 16-20 mesh, 16-30 mesh, 20-40 mesh between 30-50 mesh, 40-60 mesh, 40-70 mesh and ... so on. Ceramic Proppant is the key material in low-permeability fracturing of oil and ... order to crack the rock of oil and gas, and propping the fractures not to be closed ...