ENGOBE Russian patent published in 2013 - IPC C04B41/86 

FIELD: chemistry.

SUBSTANCE: invention relates to engobe compositions which can be used in making household ceramic articles (dishes, casks, jars, racks etc). The engobe contains, wt %: clay 68.3-77.0; ground scrap sheet window glass 5.0-7.0; a colouring additive 0.5-9.0; glycerol 0.3-0.7; zircon 3.0-4.0; bone ash 11.0-13.0. Components of the mixture are mixed and glycerol is added. Moisture content of the engobe should be 35-50%. The engobe is applied onto the surface of moulded ceramic articles and fired. The engobe has heat resistance of 190-210°C.

EFFECT: high heat resistance of the engobe.

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