Abstract
The effect of ZnO on sheet‐iron cover‐enamel properties was studied by evaluation of the propcrties of a typical sheet‐iron cover enamel in which ZnO was used as single‐ and double‐partial replacements for the various ingredients. The fluxing action of ZnO was found to bc pronounced and i i was markedly effective in decreasing frit solubility in the mill liquor. Improvement in gloss resulted from its use without any adverse effect on enamel extensibility and resistance to thermal shock.

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