The rotating specimen method has been used to measure the emittance of samples of a microporous ceramic material. Data on total and spectral normal emittance obtained over the temperature range 300 - 700 ℃ and the wavelength range 1.2 - 19.8 μm are reported. The spectral distribution of emittance is insensitive to temperature over the range covered. Good agreement was obtained between values of total emittance measured directly and those calculated by integration of the spectral measurements. Total normal emittance decreases steadily with increase of temperature. The present results are compared with data produced earlier for ceramic fibre insulation material and a specimen of high-porosity rigid ceramic material.
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