Perlite-Based Heat Insulation Materials

Perlite heat insulation materials may be made cement-bonded (without firing) and fired clay-bonded. The service temperature of good perlite-based heat insulation materials may be up to 1,200 °C and is determined by the binder. 

The possible defects are only dimensional tolerances and cavities. 

2 Refractories and Carbon Cathode Materials for Aluminium Reduction Cells 

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The range of heat insulation materials is rather broad. Heat insulation materials that can withstand relatively high mechanical loads - this list includes lightweight fireclay bricks, vermiculite slabs, perlite bricks, calcium silicate boards, and diatomaceous bricks - are used for the heat insulation of the bottom. The pressure on the walls is lower, so it is possible to use fiber-based boards (in addition to the above-mentioned materials). Sometimes lightweight castables with fillers, such as lightweight fireclay, vermiculite, and fiber, are also used for heat insulation. 

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