5. Thermal insulation materials, technical characteristics ...
2021-2-9u2002·u2002Thermal resistance (R-value) The thermal resistance (R-value) is the reciprocal of l (1/l) and is used for calculating the thermal resistance of any material or composite material. The R-value can be defined in simple terms as the resistance that any specific material offers to the heat flow. A good insulation material will have a high R-value.
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