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The German Standard Deutsche Industrie Norm (DIN) 51046 covers the measurement of thermal conductivity of refractories up to 1600°C by the hotwire method. From the publishing of the first draft in 1969 to issuing the standard in 1976, several round-robin tests and other experimental work have shown that 1. the hot-wire method is safe to use for material up to K = 2 W/m * K, and under certain precautions may be used up to K = 6 W/m * K, 2. the simplified solution of the Fourier differential equation used in the standard can be safely applied if the thermal diffusivity is smaller than a = 0.002 m2/h, 3. for material with a > 0.002 m2/h, the recommended measuring time has to be reduced. 4. several recommendations can be given about the type of furnace and measuring equipment and suggestions can be made on how to avoid errors, and 5. the hot-wire method produces consistently higher values for thermal conductivity than other methods, including the ASTM procedure.
The hot-wire method has been adopted by the Féderation Européenne des Fabricants de Produits Réfractaires (PRE) as Recommendation 32 and has been submitted to the Technical Committee TC 33 of the International Standardization Organization (ISO).
thermal conductivity, hot-wire method, refractories, insulating brick, standardization
Manager, Didier Werke AG, Didier Research Institute, Wiesbaden,