| 摘要 |
A hot top which is adjusted to be superimposed on an ingot mold having an annular recess around the opening in the top of the mold. The hot top can be in the form of a single-use structure or a metal casing having a single-use liner insert unit supported therein. The single use structure and the metal casing are adapted for placement in the recess to form a continuation of the opening in the ingot mold. The structure and the insert liner unit are formed from a heat-destructible refractory material. A heat-destructible gasket formed from a compressible plastic material is secured to the bottom of the structure or the bottom of the panels to form a seal at the juncture of the hot top with the top of the ingot mold.
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