Chemical Property of Chromium oxide
Chemical Property:
- Appearance/Colour:green crystalline powder
- Melting Point:2435 °C, 2708 K, 4415 °F
- Refractive Index:2.551
- Boiling Point:4000 °C, 4273 K, 7232 °F
- Flash Point:3000 °C
- PSA：0.00000
- Density:5.22 g/cm3
- LogP:-0.35640
- Storage Temp.:Room Temperature
- Solubility.:Insoluble in all solvents
- Water Solubility.:Insoluble
- Purity/Quality:
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99% *data from raw suppliers
Chromium(III) oxide
*data from reagent suppliers
Safty Information:
- Pictogram(s):
- Hazard Codes:
- Safety Statements:
24/25
- MSDS Files:
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SDS file from LookChem
Total 1 MSDS from other Authors
Useful:
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Description
Chromium(III) oxide is among the ten most abundant compounds in the Earth's crust. It is one of four oxides of chromium, chemical formula Cr2O3. It is commonly called "chrome green" when used as a pigment; however it was referred to as “viridian” when it was first discovered.
Chromium(III) oxide is a very refractory ceramic colorant (even a 50% mix with a high borax frit will not even begin to melt it in a crucible). Chrome oxide is the only stable oxide of the metal chromium. It is a bright to dark green crystalline powder insoluble in alkalis and acids. It is manufactured from the mineral Chromite mined in southern Africa, Asia, Turkey and Cuba. As with other powerful coloring agents, chrome must be milled fine enough to eliminate specking in glass or glaze.
Chromium is a "fast" colorant, meaning can produce strong green colors under all furnace conditions, slow or fast, reducing or oxidizing. It is also a flat colorant (due to its refractory nature), it usually produces an army helmet opaque green. It is powerful, typically only 2% will produce a dark color. It cannot be used to make a metallic glaze.
Chrome oxide is usually employed in raw glazes whereas potassium dichromate is used in fritted glazes.
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Physical properties
Green hexagonal crystal system; corundum type structure; density 5.22 g/cm3; melts at 2,330°C; vaporizes above 3,000°C; insoluble in water and alcohol.
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Uses
Chromium oxide (Cr2O3) is a dull green synthetic inorganic pigment,
which can be used in all types of paint systems where high chemical
resistance and outstanding light-fastness are required. In abrasives, refractory materials, electric semiconductors; as pigment, particularly in coloring glass; in alloys; printing fabrics and banknotes; as catalyst for organic and inorganic reactions. Chromium(III) oxide is used as pigment for coloring green on glass and fabrics. Other important applications are in metallurgy; as a component of refractory bricks, abrasives and ceramics; and as a catalyst in hydrogenation, hydrogenolysis and many other organic conversion reactions. It also is used to prepare other chromium salts.
