magnesia cupels cannot satisfactorily be made in the laboratory like bone-ash cupels-cs ceramic

Magnesia Cupels ¡ª Magnesia was introduced a few years ago, as a substitute for bone-ash and a large number of brands of so-called "patent" cupels made with a magnesia base are now on the market. The magnesia (MgO) is produced by strongly calcining crude mineral magnesite (magnesium carbonate, MgO,CO2). The cupels require to be made under high pressure and should be baked at a high temperature before use. They are then very hard and firm and of a brown colour, resembling fireclay. Owing to the high pressure required (usually hydraulic), magnesia cupels cannot satisfactorily be made in the laboratory like bone-ash cupels

magnesium oxide and bone ash cupels	magnesium oxide and bone ash cupels	Magnesium sand cupel	Ceramic Couple
Plate cupel	Fire assay cupel	magnesia boat crucible	magnesium oxide crucible

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