Decoration exterior wall sandwich panel pu board

【1】 Rigid polyurethane has low thermal conductivity and good thermal performance. When the density of rigid polyurethane is 35 ~ 40kg / m3, the thermal conductivity is 0.018 ~ 0.024w / (m.k). At present, the thermal conductivity of all thermal insulation materials is the lowest. High moisture-proof and waterproof performance. 【2】 Rigid polyurethane has moisture-proof and waterproof properties. The closed cell rate of rigid polyurethane is more than 90%, which belongs to hydrophobic material. It will not increase the thermal conductivity due to moisture absorption, and the wall will not seep. 【3】 Rigid polyurethane is fireproof, flame retardant and high temperature resistant. Polyurethane is a flammable self extinguishing material after adding flame retardants. Its softening point can reach above 250 degrees Celsius. It will decompose only at higher temperatures. In addition, polyurethane will form carbon deposits on its foam surface when burning, which helps to isolate the foam below. It can effectively prevent the flame from spreading.