Factory made rigid polyurethane foam (PUR) products. In the case of rigid polyurethane foams, thermal conductivity can be determined using standard method (BS EN 13165:2008 Thermal insulation products for buildings. The K-factor is affected by the conductivity of blowing gas and thus relevant. Materials having K-factor below 0.06 W/(mK) are considered insulating materials. The lower the K factor, the better the insulation. The insulation materials have a K-factor of less than one. The unit of measurement for thermal conductivity (λ) is W/(m. Thermal conductivity represents the heat flow in watts (W) through a 1 m 2 surface and 1 m thick flat layer of a material when the temperature difference between the two surfaces in the direction of heat flow amounts to 1 Kelvin (K). The K-factor of insulation represents the material's thermal conductivity or ability to conduct heat. George Wypych, in Databook of Blowing and Auxiliary Agents, 2016 FOAM K-FACTOR
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