... China, as the main starting material, though a process consisting of batching, grinding, granulating, drying and firing. It has ... excellent conductivity, etc. We can supply fracture proppants in full range,including 20/40 LD AND MD,30/50 LD, etc ... consideration to produce products meeting customers' exact needs in term of size, density and other properties. Company Profile: Zhengzhou Duesail ...