A wide variety of products go into the crucible system for induction melting.

Crucibles can be isostatically pressed, for uniform density, or cast in capacities up to 3000kg.  Backing the crucible is a monolithic rammed lining, a slip plane and possibly an outer sleeve or a quick-change crucible-basket assembly; atomising or metering nozzles may be required for bottom pouring

The casting manufacturing system also allows for special shapes to be made, such as ladles, tundishes, launders, pouring spouts.


Assay Ceramics

FIRE ASSAY CRUCIBLES are used to prepare the lead button, including the precious metal sample, for cupellation. These crucibles combine a high mechanical strength and erosion resistance with an ability to withstand severe thermal shocks from the assay furnace. The inclusion of fused silica in the mix enhances the TSR.

SCORIFIERS perform the same function, removing the gangue, but without using a furnace.

During cupellation the lead is oxidized to litharge (PbO), most of which is absorbed by the CUPEL, leaving at the finish a bead of gold, silver, and most of the platinum and associated precious metals that may be present. The cupels supplied are made from magnesite with a controlled pore structure for rapid absorption of litharge leaving an easily-removed bead

For convenience, BULLION BLOCKS are available with between 4 and 14 cups per block, in the same magnesite material as the cupels.