In terms of performance, polyurethane sandwich panels have many highlights. Its fire resistance level is excellent. The ordinary type can reach B1 level (flame-retardant level) specified in GB8624. It is not easy to spread fire and has low smoke density when burning. After adding high-efficiency flame retardants, it can be close to Class A standards, suitable for places with strict fire protection requirements. The thermal insulation performance is excellent, with a thermal conductivity as low as 0.022 – 0.027W/(m・K), which is far better than glass magnesium, rock wool and other materials. It is one of the materials with the lowest thermal conductivity in the current building insulation field, especially in line with the insulation needs of low-temperature environments such as cold storage. Moisture resistance is also outstanding. The water absorption rate of the core material of the closed-cell structure is ≤1%. In high-humidity environments, such as cold storage and basements, it is not easy to absorb water and deform, and can maintain structural stability for a long time. In terms of mechanical strength, the board has a bending strength of ≥15MPa and a compressive strength of ≥0.25MPa, but it is light in texture, weighing about 8-12kg per square meter, and is suitable for large-span roof or wall structures, achieving a perfect balance between lightness and high strength. ​