will not increase the thermal conductivity due to moisture absorption, the wall will not seepage. 3, rigid polyurethane fire, flame retardant, high temperature. Polyurethane is a flame retardant, self-extinguishing material with a flame retardancy of 250 ?? C or higher, which decomposes only at higher temperatures: Polyurethanes, on the other hand, The formation of ash, this layer of ash helps to isolate the underlying foam. Can effectively prevent the spread of fire. Also, polyurethanes do not produce harmful gases at high temperatures. 4, due to the excellent thermal insulation of polyurethane sheet, to achieve the same insulation requirements, can reduce the thickness of the building envelope, thereby increasing the indoor use area. 5, anti-deformation ability, not easy to crack, finishes stable and safe. 6, the porosity of polyurethane material structure is stable, basically closed-cell structure, not only excellent insulation properties, but also freeze-thaw resistance, sound absorption Ye Hao. Rigid polyurethane insulation structure of the average life expectancy, under normal use and maintenance conditions, can reach more than 30 years. Can be destroyed under dry conditions, dampness or galvanic corrosion under normal conditions of service life of the
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