... divided into 52Mpa, 69Mpa, 86Mpa,and 103Mpa three series, according to bulk density,Ceramic Proppant is divided into: low-density, medium ... material in low-permeability fracturing of oil and gas wells' exploration. This product is used in the construction of deep well fracturing ... oil by high closed fracturing, thereby to maintain the high conductivity of oil and gas. Ceramic sand proppant for oil and ...