... -density high-strength proppant 2. medium-density high-strength proppant 3. low-density high-strength proppant `````````````````````````````````````````````````````````````````````````````````Ceramic Proppant is divided into 52Mpa ... ,and 103Mpa three series, according to bulk density,Ceramic Proppant is divided into: low-density, medium density, ... 70 mesh and so on pop oil fracture ceramic proppant