1. When the high temperature resistant foam is used for external wall and roof insulation, it will generally not cause obvious damp problems. However, when one side of the EPS board is in a high temperature and high humidity environment for a long time, and the other side is in a low temperature environment and is sealed by materials with poor water vapor permeability; or when the roof waterproof layer fails, the EPS board may be severely damp, resulting in its thermal insulation performance Severely reduced. When used in cold storage, air-conditioning and other low-temperature pipe insulation, a vapor barrier must be provided on the outer surface of the EPS board.
2. It is light in weight and has certain compressive and tensile strength. It can support the protective layer of the wiped surface by its own strength, and it does not need pull-connecting parts, which can avoid the formation of thermal bridges. The EPS board has the smallest thermal conductivity in the density range of 30-50 kg/m; when the average temperature is 10℃ and the density is 20kg/m, the thermal conductivity is 0.033～0.036W/(m·K); the density is less than 15 kg /m, the thermal conductivity increases sharply as the density decreases; EPS boards with a density of 15-22 kg/m are suitable for external insulation.
3. It has a unique fine closed-cell honeycomb structure. Compared with EPS board, it has the characteristics of high density, high compression performance, low thermal conductivity, low water absorption, and low water vapor permeability coefficient. In a long-term high humidity or water immersion environment, XPS board can still maintain its excellent thermal insulation performance. Among various commonly used thermal insulation materials, it is the only one that can maintain the thermal resistance retention rate of more than 80% after two years under 70% relative humidity. Insulation materials.
Due to the low long-term water absorption rate of XPS board, it is especially suitable for inverted roof and air-conditioning duct. High temperature resistant foam also has good freeze-thaw resistance and better compressive creep resistance.