perlite tee is a non-asbestos, high performance and water repellent insulating material composed of expanded perlite particles bonded with inorganic binder and reinforcing fiber, designed to provide suitable insulation for heated piping systems, equipments, process vessels used in power stations, petrochemical plants, petroleum refineries, heat distributing systems and other process industries. 600*300*25-100mm ASTM C610 & C795 Manufacturer for more than 20 years! Best insulation in China