Rock wool thermal conductivity (25 ℃) ≤ 0.036W / mk, thermal conductivity, with good thermal insulation properties. 100mm thick rock wool is equivalent to 4.7 meters thick reinforced concrete insulation achieved. Ordinary rock wool does not have a damp-proof effect, after the rain will reduce the insulation function, plus the water-repellent hydrophobic type rock wool does not reduce the insulation function.But hydrophobic does not mean that water
Thermal conductivity: thermal conductivity is a physical indicator of the thermal conductivity of substances, referred to as lambda value. Refers to the unit of time, in the case of unit temperature, the thickness of the object through the unit of heat transfer. The unit is W / (m · k), and in the former system, Kcal / (m · h · ° C) = 4.18 * 1000/3600 (W / (m · k)) = 1.161 W / (m · k) .
Thermal conductivity and the material itself and the temperature, but not with the shape, size, thickness of the material.
The smaller the thermal conductivity, the better the thermal insulation performance, the better the energy saving effect.
Thermal insulation materials thermal performance is determined by the thermal conductivity. Small thermal conductivity, thermal insulation performance. The thermal conductivity of a material is related to its own composition, apparent density, internal structure, and the average temperature of the heat transfer and the moisture content of the material. In general, the lower the apparent density, the smaller the thermal conductivity. However, for loose fibrous materials, the apparent thermal conductivity decreases with decreasing apparent density when the apparent density is less than the optimum limit.
Under the same conditions of material apparent density, average temperature and water content, the larger the number of pores in unit volume of porous material is, the smaller the thermal conductivity is. The thermal conductivity of loose particles decreases with the increase of particles in unit volume The thermal conductivity of loose fiber material decreases with decreasing fiber cross section.
Rock wool board thermal conductivity (25 ℃) ≤ 0.039W / mk, the national standard GB / T25975 requirements ≤ 0.040W / mk.
Rock wool strip / belt (is the fiber perpendicular to the wall) Thermal conductivity ≤ 0.044 W / mk. National standard GB / T25975 requirements ≤ 0.048W / mk
Heat transfer coefficient, also known as thermal conductivity, referred to as U value, refers to the unit temperature difference, the heat transmitted through the thickness of the object. The unit is W / (m2 · k). The heat transfer coefficient is not only related to the material itself but also to its thickness U = λ / product thickness (m).
Thermal resistance for the thermal conductivity λ value of the reciprocal, referred to as R value. R = 1 / U = Thickness of product (m) / λ unit is (m2 · k) / W. The thermal resistance of multilayer thermal insulation material is calculated by adding the thermal resistance of each layer.
insulation performance:
Rock wool thermal conductivity is small (25 ℃) ≤ 0.036W / mk, with good thermal insulation properties. 100mm thick rock wool is equivalent to 4.7 meters thick reinforced concrete insulation achieved.