Polyurethane insulation board is based on rigid polyurethane foam, which has the functions of heat preservation, waterproof, sound insulation, etc. Its thermal conductivity is as low as 0.018-0.024W/(m · K), with a closed cell rate of over 90%. It has both compressive strength and dimensional stability, and its fire resistance meets the B1 level standard. Through composite materials such as rock wool, it can meet the A-level fire protection requirements. This material has been used in European construction, industry and other fields since the 1960s, and has now become the mainstream insulation material selected by many countries around the world.