1, low coefficient of thermal conductivity of rigid polyurethane thermal performance. Rigid polyurethane density 35 ~ 40kg/m3, the thermal conductivity is only 0.018 ~ 0.024w / (m.K), equivalent to about half of the EPS, all insulation materials is the lowest thermal conductivity. Rigid polyurethane moisture-proof, waterproof performance. The rigid polyurethane Obturator rate belong to the hydrophobic material, not more than 90%, due to moisture absorption to increase the thermal conductivity, the walls are also not seepage. 3, rigid polyurethane fire, flame retardant, high temperature. Polyurethane additive flame retardant, a flame retardant self-extinguishing material, its softening point up to 250 degrees Celsius or more, only to appear in the higher temperature decomposition: addition, polyurethane burning in foam formed on the surface of carbon deposition, this layer of coke will help isolate the following bubble. Can effectively prevent the spread of flame. Moreover, the polyurethane at high temperatures do not produce harmful gases. Polyurethane sheet with excellent thermal insulation properties, to achieve the same insulation requirements can reduce buildings external structure thickness, thereby increasing the indoor area. Resistance to deformation, not easy to crack, finishes, security. 6, the porosity of the structure of the polyurethane material is stable, basically a closed-cell structure, not only excellent thermal insulation properties, and freeze-thaw resistance, sound absorption or a. The average life expectancy of the structure of rigid polyurethane foam insulation, under normal use and maintenance conditions, can reach more than 30 years. Be able to do in the lifetime of the structure under normal use conditions, in the dry, wet or galvanic corrosion, as well as insects, fungi or algae growth, or, are not damaged due to the destruction of rodents and other external impacts. 7, the low overall cost-effective. Rigid polyurethane foam material unit price than other traditional insulation materials unit price, but the increase in cost will significantly reduce heating and cooling costs offset