ChemicalBook >  Product Catalog >  Inorganic chemistry >  Oxides and peroxides >  Metal oxide >  Chromium(III) oxide

Chromium(III) oxide

Basic information Safety Related Supplier

Chromium(III) oxide Basic information

Product Name:
Chromium(III) oxide
CAS:
1308-38-9
MF:
Cr2O3
MW:
151.99
EINECS:
215-160-9
Mol File:
1308-38-9.mol
More
Less

Chromium(III) oxide Chemical Properties

Melting point:
2435 °C
Boiling point:
4000 °C
Density 
5.21
refractive index 
2.551
Flash point:
3000°C
form 
powder
color 
Pale to dark green
Specific Gravity
5.22
Water Solubility 
Insoluble
Merck 
14,2234
Stability:
Stable.
CAS DataBase Reference
1308-38-9(CAS DataBase Reference)
NIST Chemistry Reference
Chromium(iii) oxide(1308-38-9)
EPA Substance Registry System
Chromium(III) oxide (1308-38-9)
More
Less

Safety Information

Safety Statements 
24/25
WGK Germany 
-
RTECS 
GB6475000
TSCA 
Yes
HS Code 
28199090
Hazardous Substances Data
1308-38-9(Hazardous Substances Data)

MSDS

More
Less

Chromium(III) oxide Usage And Synthesis

Description

Chromium oxide green, also known as chromium sesquioxide or chromia, 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.
Chrome 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.

Chemical Properties

green crystalline powder

Chemical Properties

Chromium oxide is a bright green, odorless powder

Uses

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.

Uses

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.

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.

Definition

chromium sesquioxide: A green crystallinewater-insoluble salt, Cr2O3; r.d. 5.21;m.p. 2435°C; b.p. 4000°C. It is obtainedby heating chromium in astream of oxygen or by heating ammoniumdichromate. The industrialpreparation is by reduction ofsodium dichromate with carbon.Chromium(III) oxide is amphoteric,dissolving in acids to give chromium(III) ions and in concentratedsolutions of alkalis to give chromites.It is used as a green pigment in glass,porcelain, and oil paint.

Hazard

Toxic by ingestion and inhalation.

Safety Profile

Confirmed carcinogen with experimental tumorigenic data. Mutation data reported. Probably a severe

Potential Exposure

Chromium(III) oxide is used as a paint pigment, a fixative for certain textile dyes; in the manufacture of chromium; and a catalyst.

Shipping

UN3086 Toxic solids, oxidizing, n.o.s., Hazard Class: 6.1; Labels: 6.1-Poisonous materials, 5.1-Oxidizer. Technical Name Required. Spill Handling: Evacuate persons not wearing protective equipment from the danger area of spill or leak until cleanup is complete. Remove all ignition sources. Collect powdered material in the most convenient and safe manner and deposit in sealed containers. Ventilate area after clean-up is complete. It may be necessary to contain and dispose of this chemical as a hazardous waste. If material or contaminated runoff enters waterways, notify downstream users of potentially contaminated waters. Contact your local or federal environmental protection agency for specific recommendations. If employees are required to clean-up spills, they must be properly trained and equipped. OSHA 1910.120(q) may be applicable.

Incompatibilities

A strong oxidizer. Contact with reducing agents; organics, and combustibles may be violent

More
Less

Chromium(III) oxideSupplierMore

Sinopharm Chemical Reagent Co,Ltd. Gold
Tel:
86-21-63210123
Email:
sj_scrc@sinopharm.com
J & K SCIENTIFIC LTD.
Tel:
010-82848833- ;010-82848833-
Email:
jkinfo@jkchemical.com;market6@jkchemical.com
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel:
21-61259100-
Email:
sh@meryer.com
INTATRADE GmbH
Tel:
+49 3493/605464
Email:
sales@intatrade.de
Alfa Aesar
Tel:
400-610-6006; 021-67582000
Email:
saleschina@alfa-asia.com
Basic information Safety Related Supplier