1.20/40 30/50 HSP 2.Ceramic Proppant 3.supplier of sinopec and petrochina 4.Increase output of 30%-50% 5.ISO 9001 ... :2008 20/40 30/50 HSP Intertek Refractories Co., Gongyi City ... and many other series of ceramic products, covering 20/40 mesh, 40/70 mesh, 30 / 50 mesh and other specifications, product quality ...