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