Improvements in or relating to the formation of cellular bodies

Abstract

Abstract Porous materials, for use as fire, vermin and moisture proof materials or floats for nets or rafts, are prepared by heating together a powdered silicate material consisting of a natural non-vitreous mineral composed essentially of silica, alumina, and alkali metal oxides, and a gas-generating material containing powdered carbon and an oxygen-containing agent. The mineral may contain 55-77 per cent silica, 13-28 per cent alumina, and 1-18 per cent alkali metal oxides, e.g. nepheline kyanite, felspar, or spodumene, and the oxygen-containing agent may be calcium sulphate, magnesium sulphate, calcium carbonate, antimony trioxide, or arsenic trioxide. To produce a mixture sintering at 1,500-1,800 DEG C., 10-20 per cent of a flux, such as sodium oxide or peroxide, or soda ash, may be added. After firing the product is cooled and annealed.

Inventors

No inventors recorded.

Bibliographic Details