Iron Chromate

Alternate Names: Ferric Chromate, Chromite, Chromate of Iron

Oxide	Analysis	Formula
Cr2O3	67.85%	1.00
FeO	32.40%	0.89
Oxide Weight		224.58
Formula Weight		224.58

Notes

A dense compound of iron and chromium. It is very refractory in oxidation, even with 50% borax and zero-alumina Ferro frit 3134 it does not melt. It is used in glazes to produce gray (with feldspar), brown (with zinc), red (with tin) or black depending on the base glaze and percentage and other coloring oxides present. Often used in underglazes, engobes and clay bodies.

Highly toxic in absorption, inhalation, and ingestion.

Related Information

How do metal oxides compare in their degrees of melting?

These metal oxides have been mixed with 50% Ferro frit 3134 and fired to cone 6 oxidation. Chrome and rutile have not melted, copper and cobalt are extremely active melters, frothing and boiling. Cobalt and copper have crystallized during cooling. Manganese has formed an iridescent glass.

Links

Hazards	Iron oxide and Hematite
Hazards	Chromium Compounds Toxicology
Typecodes	Colorant Metallic based materials that impart fired color to glazes and bodies.

Data

Frit Softening Point	1800C M
Density (Specific Gravity)	4.50

By Tony Hansen
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