Keramicalia

Tel: +27 (0)11 412 3261 or +27 082 808 4757
We manufacture specialised refractories and ceramics.

Magnesia Mastic

A sealant which can contact molten metal without exploding.

Based on a high temperature oil, a Bentone carrier and ceria-zirconia-alumina powder.  Ceria (25%, melting point 1692°C), zirconia (10%, melting point 2715°C) and alumina (45%, melting point 2013°C) have no mutual compounds so the powder cannot sinter and harden even at steel melting temperatures.

Supplied in mastic tubes, which must be stored with the nozzle facing downwards, otherwise the oil leaks out.

Applications;  Sliding gate seals, replaceable lance tip seals, sealing of any refractory components which need to be separated after exposure to heat.

Shelf life indefinite.

Totally inert and edible.

Development no. 122400.

Claimer;  The above data had better be correct, as Dave Onderstall stakes his reputation on it.