Thermal conductivity of insulation materials

　　The thermal conductivity of thermal insulation materials is an important indicator to measure its thermal insulation performance, usually expressed by λ (lambda), and the unit is W/(m·K). The smaller the coefficient, the better the thermal insulation performance of the material. The following are the thermal conductivity coefficients of some common insulation materials for reference only:

　　1. Thermal conductivity of expanded perlite: 0.03 ~ 0.05 W/(m·K);

　　2. Thermal conductivity of glass wool: 0.03 ~ 0.06 W/(m·K);

　　3. Thermal conductivity of slag wool: 0.03 ~ 0.08 W/(m·K);

　　4. Thermal conductivity of polystyrene insulation board: 0.03 ~ 0.04 W/(m·K);

　　5. Thermal conductivity coefficient of polyurethane insulation board: 0.02 ~ 0.03 W/(m·K);

　　6. Thermal conductivity of polyurethane foam: 0.02 ~ 0.03 W/(m·K);

　　7. Thermal conductivity of airgel: 0.008 ~ 0.018 W/(m·K).

　　It should be noted that the thermal conductivity of materials in actual use may be affected by many factors, such as material density, porosity, temperature, etc. At the same time, when selecting insulation materials, factors such as fire resistance, environmental protection, safety, and construction convenience must also be considered, and the selection should be based on specific application conditions and specification requirements.