Chromium(III) oxide
Synonym(s):Chromia
- CAS NO.:1308-38-9
- Empirical Formula: Cr2O3
- Molecular Weight: 151.99
- MDL number: MFCD00010949
- EINECS: 215-160-9
- SAFETY DATA SHEET (SDS)
- Update Date: 2024-05-18 08:51:57
What is Chromium(III) oxide?
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.
The Uses of Chromium(III) oxide
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.
What are the applications of Application
Chromium(III) oxide is Suitable for vacuum deposition
Properties of Chromium(III) oxide
Melting point: | 2435 °C |
Boiling point: | 4000 °C |
Density | 5.21 |
Flash point: | 3000°C |
storage temp. | Room Temperature |
solubility | Insoluble in all solvents |
form | powder |
color | Pale to dark green |
Water Solubility | Insoluble |
Safety information for Chromium(III) oxide
Signal word | Danger |
Pictogram(s) |
Exclamation Mark Irritant GHS07 |
GHS Hazard Statements |
H302:Acute toxicity,oral H317:Sensitisation, Skin H332:Acute toxicity,inhalation |
Precautionary Statement Codes |
P261:Avoid breathing dust/fume/gas/mist/vapours/spray. P321:Specific treatment (see … on this label). P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. |
Computed Descriptors for Chromium(III) oxide
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