Enamels Glass-melting furnaces

Most enamels melt at ca. 1250°C. Only a few difficult to melt frits require temperatures of ca. 1350°C. The raw materials are smelted, but not, as in glass manufacture, refined. Fig. 5.4-1. schematically. shows the construction of drum and flame-heated tank furnaces. 

Pot Furnace. A furnace in which glass is melted and refined in pots (q.v.), or in which a frit is melted for use in a glaze or in a vitreous enamel. 

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