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Main characteristics of polyurethane insulation board:
1. Rigid polyurethane features low thermal conductivity and good thermal performance, and when the density of rigid polyurethane is among 35-40kg/m³, the thermal conductivity is only 0.018-0.024W/(m·K), nearly half of ESP, and it has the lowest thermal conductivity among all thermal insulation material.
2. Rigid polyurethane features moisture-proof and water-proof. The closed hole rate of the rigid polyurethane remains over 90%, and it belongs to hydrophobic material, so, the thermal conductivity won’t increase with absorption of moisture and the wall won’t seek water.
3. Rigid polyurethane has the properties of fireproof, inflaming retarding and high temperature resistance. When adding fire retardant, polyurethane will become nonflammable self-extinguishing material, the softening point of it can reach above 250℃, and the decomposition can only happen in higher temperature conditions: in addition, when polyurethane burns, carbon disposition will be produced on the foam surface, this layer of carbon disposition will help to isolate the foam underneath, which can effectively prevent flame from spreading. Furthermore, polyurethane won’t produce harmful gas even under high temperatures.
4. As plates made of polyurethane has excellent insulation property, so, under the same heat preservation conditions, thickness of the buildings’ exterior-protected construction can be reduced, thus expanding the interior.
5. Polyurethane features strong non-deformability, stable finishing and safety, and also it is not easy to crack.
6. The porosity of polyurethane material is stable and it is basically closed cell structure. It not only features good thermal insulation, but freeze-thaw resistance and fine sound absorption. Under normal use and maintenance conditions, the average life span of rigid polyurethane insulation structure can reach above 30 years. It won’t be destroyed under such conditions as: under the normal use conditions within the life expectancy period of the structure and under conditions of dry, moist or electrochemical corrosion as well as influences caused by external factors of insects, fungi or algae or destruction caused by rodent.
7. It features high comprehensive cost-performance. Although the price of rigid polyurethane foam material is higher than that of other traditional thermal insulation materials, the increase will be offset by a substantial reduction in heating and cooling costs.
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