20/40 Mesh Fracturing Proppant (Low,Middle,High Density) 1.Size:20/40,30/50,40/70 Mesh 2.High Fracture Conductivity 3.Oil,Gas 20/40 Mesh Fracturing ... material, through a unique grinding, granulation and sintered at high temperature, high temperature, high pressure, high strength, conductivity and strong, and corrosion ...