... sinopec and petrochina 4.Increase output of 30%-50% 5.ISO 9001:2008 20/40 30/50 HSP Intertek Refractories Co., Gongyi City, ... Companies devote themselves to scientific research, innovation, more than 50 existing types of technical personnel, has developed a high-density ... ceramic products, covering 20/40 mesh, 40/70 mesh, 30 / 50 mesh and other specifications, product quality inspection by the authority ...