Ceramic Shell

The sprue system and wax positive are coated with an initial liquid coat, containing very fine powder, and sodium silicate.

 

The liquid combined with grades of molochite granules, starting with fine through to coarser grades are built up over several layers over the wax sculpture, and is finally backed up with a fibre glass matting to ensure an extremely hard and strong ceramic shell around the wax.

 

The inside cavity of the hollow wax is filled with a plaster-based mixture called Core.

 

The wax is then melted out of the ceramic shell using heat directly applied to the shell using a propane burner. This now hollow ceramic shell, with the detailed impression within that the wax has produced, is now ready to receive the molten bronze.