Foam glass with low thermal expansion was prepared using low cost unexpanded perlite ore as the starting material. The structure of the perlite derived foam glass was studied by Fourier Transform Infrared (FTIR) spectroscopy. Thermal expansion and thermal conductivity were measured according to the standard ASTM test methods. Thermal expansion decreased with decreasing sodium oxide content. This was attributed to the decreasing content of nonbridging oxygens in the glass structural network. The lowest coefficient of thermal expansion (CTE) was about 4.0 ppm/degrees C at 50 degrees C for the sample with the lowest sodium oxide content and highest boron content. Perlite derived foam glass with low thermal expansion can be used for various industrial applications such as chimney liner tiles in flue gas desulphurisation (FGD) systems in power plants.
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