(1) The use temperature is high, generally up to 100 ° C, after adding temperature-resistant auxiliary materials, the use temperature can reach 120 ° C.
(2) The foaming agent in polyurethane will continuously replace with the air in the environment due to the diffusion, so that the thermal conductivity increases with time. In order to overcome this disadvantage, a gas impermeable material such as a profiled steel sheet may be used as a surface layer to seal it to limit or slow the displacement.
(3) On-site spraying of polyurethane foam has high temperature, high compression performance and simple construction, and is more suitable for roof insulation than EPS board.
(4) When used for pipelines (especially underground buried pipelines) and roof insulation, reliable waterproof and moisture-proof measures should be taken. At the same time, it should be considered that the thermal conductivity will increase with time, and the sealing material should be used as the protective layer as much as possible.
(5) Due to the high temperature of use, it is mostly used for heating pipes.
(6) The temperature of the smoke is low, and a large amount of smoke and toxic gases are generated in case of fire, and it is not suitable for use as an internal insulation material.
(7) Although the water absorption rate is low, as a heat insulating material, it must not be used as a waterproof material.
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