perlite pipe ASK P220 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. Benefits and Features High Efficiency Water Repellent Asbestos Free Superior Strength Non-Corrosive Light Weight Technical DataTermUnitGB/T10303JIS A9510ASTM C610ASK P220DensityKg/m3≤250≤250≤224≤220Maximum Service TemperatureoC650650650650ThermalConductivity(93oC)W/m.k≤0.072(25)≤0.072(70)≤0.079(93)≤0.060(25)Compressive StrengthMpa≥0.40≥0.414≥0.414≥0.40Flexural StrengthMpa≥0.25≥0.25≥0.31≥0.20Linear Shrinkage%≤2.0≤2.0≤2.0≤2.0Water Repellency%≥98 ≥98≥98Chlorine ContentASTM C795ASTM C795