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Chromium(III) oxide

Product Name:
Chromium(III) oxide
CAS No.
1308-38-9
Chemical Name:
Chromium(III) oxide
CBNumber:
CB8394705
Molecular Formula:
Cr2O3
Formula Weight:
151.99
MOL File:
1308-38-9.mol
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Chromium(III) oxide Property

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)
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Safety

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

Sigma-Aldrich Gold
Product number:
203068
Product name :
Chromium(III) oxide
Purity:
powder, 99.9% trace metals basis
Packaging:
5g
Price:
$65.1
Updated:
2019/12/02
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Buy
Sigma-Aldrich Gold
Product number:
203068
Product name :
Chromium(III) oxide
Purity:
powder, 99.9% trace metals basis
Packaging:
25g
Price:
$138
Updated:
2019/12/02
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Buy
Alfa Aesar Gold
Product number:
010688
Product name :
Chromium(III) oxide, Puratronic?, 99.97% (metals basis)
Packaging:
5g
Price:
$41.5
Updated:
2019/12/02
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Buy
Alfa Aesar Gold
Product number:
010688
Product name :
Chromium(III) oxide, Puratronic?, 99.97% (metals basis)
Packaging:
25g
Price:
$44.9
Updated:
2019/12/02
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Buy
Strem Chemicals Gold
Product number:
93-2437
Product name :
Chromium(III) oxide, 98%
Packaging:
250g
Price:
$23
Updated:
2019/12/02
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Buy
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Chromium(III) oxide Chemical Properties,Usage,Production

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
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.

Chemical Properties

Chromium oxide is a bright green, odorless powder. Chromium(III) oxide pigments are thermally stable and insoluble in water.
Chromium oxide pigments, also called chromium oxide green pigments, consist of chromium(III) oxide [1308-38-9], Cr2O3,Mr 151.99. Chromium oxide green is one of the few single-component pigments with green coloration. Chrome green is a blend of chrome yellow and iron blue pigments; phthalochrome green is a blend of chrome yellow and blue phthalocyanine pigments.
Alkali dichromates are used as starting materials for the production of chromium(III) oxide pigments. They are not classified as hazardous materials and are not subject to international transport regulations. As long as they are kept dry their utility as a pigment is practically unlimited.

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.

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.

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(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.

Preparation

Chromium(III) oxide can be obtained by thermal decomposition of ammonium dichromate. Above ca. 200 °C, a highly voluminous product is formed with elimination of nitrogen. The pigment is obtained after addition of alkali salts (e.g., sodium sulfate) and subsequent calcination.
In the industrial process, a mixture of ammonium sulfate or chloride and sodium dichromate is calcined:
Na2Cr2O7.2 H2O + (NH4)2SO4 →Cr2O3 + Na2SO4 + 6 H2O + N2

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

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Chromium(III) oxide Suppliers

Global(314)Suppliers
Sinopharm Chemical Reagent Co,Ltd.
Tel:
86-21-63210123
Fax:
86-21-63290778 86-21-63218885
Email:
sj_scrc@sinopharm.com
Country:
China
ProdList:
9848
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79
J & K SCIENTIFIC LTD.
Tel:
010-82848833- ;010-82848833-
Fax:
86-10-82849933
Email:
jkinfo@jkchemical.com;market6@jkchemical.com
Country:
China
ProdList:
96815
Advantage:
76
Meryer (Shanghai) Chemical Technology Co., Ltd.
Tel:
21-61259100-
Fax:
86-21-61259102
Email:
sh@meryer.com
Country:
China
ProdList:
40268
Advantage:
62
INTATRADE GmbH
Tel:
+49 3493/605464
Fax:
+49 3493/605470
Email:
sales@intatrade.de
Country:
Germany
ProdList:
3579
Advantage:
66
Alfa Aesar
Tel:
400-610-6006; 021-67582000
Fax:
021-67582001/03/05
Email:
saleschina@alfa-asia.com
Country:
China
ProdList:
30163
Advantage:
84
BeiJing Hwrk Chemicals Limted
Tel:
010-57411839-
Fax:
021-55236763
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bjsales@hwrkchemical.com
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18708
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Energy Chemical
Tel:
021-58432009
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021-58436166-800
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sales8178@energy-chemical.com
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China
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44026
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Beijing Ouhe Technology Co., Ltd
Tel:
010-82967028-
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+86-10-82967029
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2355560935@qq.com
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JinYan Chemicals(ShangHai) Co.,Ltd.
Tel:
13817811078,021-50426030
Fax:
86-021-50426522,50426273
Email:
sales@jingyan-chemical.com
Country:
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60

1308-38-9, Chromium(III) oxideRelated Search:

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