Insulation bricks are special-purpose bricks, which have high insulation and refractory properties. These bricks have their applications in the metallurgy and chemical industries. International Ceramic is one of the best Insulation Bricks suppliers that you can find in India. The composition of these bricks includes the high refractory ceramics, Alumina and Silica. These bricks have a low thermal conductivity, which makes them best to be used in energy-intensive applications. Also, the high content of Alumina and Silica imparts it high refractory properties. Key Features of Insulation Bricks from International Ceramic.