Molten metal solidifies on the belts, forming a shell which becomes a liquid sump as the slab proceeds down the mold. Solidification is normally complete approximately 70% to 80% down the mold length. The critical area of the mold is the interface between the solidifying metal and moving, water-cooled belts.

The key components of the mold interface include the permanent ceramic-based belt Matrix™ coating topography and morphology, as well as the consistency of thickness and quality of the overcoat applied before or during casting. The atmosphere is controlled in the mold interface with the use of a gas layer.

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