Huahai phenolic pre-insulated air ducts take phenolic foam ascore ,aluminum foil /Galvanized steel as face metal. Be used formaking the Air Conditioning Heat Preservation Ventilating Duct’sPerfect Material , Widely used in market , supermarket , guesthouse, hotel ,stadium , workshop , airport , hospital , food store ,pure project , and underground railway so on .Be used for makingthe Air Conditioning Heat Preservation Ventilating Duct’s PerfectMaterial , Widely used in market , supermarket , guesthouse , hotel,,stadium , workshop , airport , hospital , food store , pureproject , and railway so on . Performance index: 1)Density:60-70kg/m³ 2) Oxygen index:>42 3) Thermalconductivity:0.025w/mk 4) Compressing strength:500kpa 5) Bendingstrength:1.05mpa 6) Non-combustible :Class"O" 7) Waterabsorption:1.9% 8) Max.smoke density:2% 9) Workingtemperature:-150°C to 200 °C