MIXTURE FOR MAKING ENAMEL COATING Russian patent published in 2009 - IPC C03C8/14 

FIELD: chemistry.

SUBSTANCE: present invention relates to composition of mixtures for making enamel coating on cast iron and steel objects. The mixture for making enamel coating contains frit, clay and nepheline sludge, with the following ratio of components, wt %: frit- 87.0-89.0; clay - 3.0-4.0; nepheline sludge - 8.0-9.0. Nepheline sludge is characterised by the following composition, wt % SiO₂ - 28.0-29.0; Al₂O₃ - 2.5-3.0; Fe₂O₃ - 2.5-3.0; CaO - 54.0-55.5; MgO - 1.5-2.5; Na₂O - 1.0-1.3; K₂O - 0.7-1.0.

EFFECT: increased heat resistance of enamel coating.

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