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Oxides and peroxides

Chromia

Also known as Chromium(III) oxide, Dichromium trioxide, Chromic oxide

CAS 1308-38-9Formula Cr2O3Molar mass 151.99 g/molEC 215-160-9
GHS signal word: Danger. Pictograms: Harmful or irritant, Serious health hazard 102 suppliers listed Drug substance
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Chromia chemical structure, Cr2O3, CAS 1308-38-9
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Light to dark green, fine, hexagonal crystals
Melting point
2,435 °C
Boiling point
4,000 °C
Density
5.22 g/cm³
Solubility
In water, 3.13 ug/L at 20 °C, pH 6, 2.96 ug/L at 20 °C, pH 8
HS code
281990
Category
Oxides and peroxides
Illustrative photo, green pigment powder in a glass jar on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Chromia?

Plain description, key identifiers and synonyms

Dichromium trioxide is a chromium oxide.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
oxo(oxochromiooxy)chromium
CAS number
1308-38-9 CAS number cross-checkedOther or deprecated CAS: 196696-68-1
EC numbers
215-160-9, 606-354-8
Molecular formula
Cr2O3
UNII
X5Z09SU859
MDL number
MFCD00010949
INCI name
CI 77288
InChIKey
QDOXWKRWXJOMAK-UHFFFAOYSA-N
InChI
InChI=1S/2Cr.3O
SMILES (canonical and isomeric)
O=[Cr]O[Cr]=O

Synonyms

  • Chromium(III) oxide
  • Dichromium trioxide
  • Chromic oxide
  • Chrome oxide
  • Chrome Green
  • Green chromium oxide
  • Green cinnabar
  • Chrome ochre
  • Chromium Oxide Green
  • Anadonis Green
  • Casalis Green
  • Green rouge
  • Chrome Ocher
  • Leaf green
  • Chromium(3+) oxide
  • Levanox green ga
  • chromium (III) oxide
  • Oxide of chromium
  • Green oxide of chromium
  • Green chrome oxide
  • Chromic Acid Green
  • Green chromic oxide
  • Chrome Green F 3
  • Chromium oxide (Cr2O3)
  • Kromex U 1
Show all 39 synonyms
  • Chromium oxide greens
  • OKhP1
  • Amperit 704.0
  • Chrome Oxide Green BX
  • Chrome Oxide Green GP
  • Chromium(3+) trioxide
  • Amdry 6410
  • Chromium Oxide X1134
  • 11661 Green
  • Chromium(III) sesquioxide
  • Chromium oxide (Cr8O12)
  • Pure chromium oxide green 59
  • Chromium(III) oxide (2:3)
  • Cosmetic hydrophobic Green 9409

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Light to dark green, fine, hexagonal crystalsexp.
Melting point
2,435 °Cexp.
Boiling point
4,000 °Cexp.
Density
5.22 g/cm³exp.
Solubility
In water, 3.13 ug/L at 20 °C, pH 6, 2.96 ug/L at 20 °C, pH 8exp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
151.99 g/molcalc.
Exact mass
151.8658 Dacalc.
LogP (octanol/water)
-0.31calc.
Topological polar surface area
43.37 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
2calc.
Heavy atoms
5calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS07: Harmful or irritant
Harmful or irritant
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H302Harmful if swallowed.
  • H317May cause an allergic skin reaction.
  • H319Causes serious eye irritation.
  • H360May damage fertility or the unborn child.
Precautionary statements (18)
  • P203Obtain, read and follow all safety instructions before use.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P264 + P265Wash skin thoroughly after handling. Do not touch eyes.
  • P270Do not eat, drink or smoke when using this product.
  • P272Contaminated work clothing should not be allowed out of the workplace.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P317If swallowed: Get medical help.
  • P302 + P352If on skin: Wash with plenty of water.
  • P305 + P351 + P338If in eyes: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P318If exposed or concerned, get medical advice.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P333 + P317If skin irritation or rash occurs: Get medical help.
  • P337 + P317If eye irritation persists: Get medical help.
  • P362 + P364Take off contaminated clothing. And wash it before reuse.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Chromia suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 102 suppliers
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Where suppliers are based

102 suppliers in 24 countries

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Chromia price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

In abrasives, refractory materials, electric semiconductors, as pigment, particularly in coloring glass, in alloys, in printing fabrics and banknotes, catalyst for organic and inorganic reactions.

Used in dyeing polymers, ... colorant for latex paints.

In metallurgy in the manufacture of chromium metal and aluminum-chromium master alloys.

Plastics -> Typical concentration range in plastic materials -> 1%.

Industrial uses: Abrasives, Other, Pigment, Dye, Catalyst, Corrosion inhibitor.

Consumer uses: Other, Processing aids not otherwise specified, Catalyst, Corrosion inhibitor, Pigment.

Use classes: Plastics, Cosmetics.

Cosmetic ingredient, INCI name CI 77288(colorant)

Functional uses

  • Abrasive
  • Dye
  • Pigment
  • Surface modifier

Cosmetic functions

  • Colorant

How it is made

The industrial production of chromium(III) oxide involves the reduction of solid sodium dichromate, generally with sulfur. The finely divided components are thoroughly mixed, fed into a brick-lined furnace, and brought to dark-red heat. The reaction proceeds exothermically. After the reaction mass has cooled, it is broken up and the sodium sulfate produced is leached out with water.

Read more

The remaining solid is separated, rinsed, dried, and ground.

Prepared by reaction of sodium dichromate or chromate with sulfur.

Anhydrous chromic oxide is produced commercially by heating chromic hydroxide, by heating dry ammonium dichromate, or by heating sodium dichromate with sulfur and washing out the sodium sulfate. The hydrated material is made commercially by calcining sodium dichromate with boric acid and hydrolyzing chromic borate.

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory
  • EU Cosmetics Regulation Annex IV, allowed colourant
    Name: CI 77288, Ref no: 129, Annex ref: IV/129
  • Active ingredient in FDA approved drug labels

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Chromia is traded under.

HS 2819.90Indicative HS code

Chromium oxides and hydroxides, other

World exports in 2024
$181M
+6.6% vs 2023, imports $320M
2019 to 2024
Top exporters
  1. Kazakhstan * partner reported35.8%
  2. China24.0%
  3. Germany23.8%
Top importers
  1. Estonia29.4%
  2. United Kingdom18.3%
  3. Spain10.1%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Chromia is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Chromia, based on the data on this page

What is Chromia?

Dichromium trioxide is a chromium oxide.

What is the CAS number of Chromia?

The CAS registry number of Chromia is 1308-38-9. Other or deprecated CAS numbers: 196696-68-1.

What is the molecular formula and weight of Chromia?

The molecular formula of Chromia is Cr2O3 and its molar mass is 151.99 g/mol.

What is Chromia used for?

In abrasives, refractory materials, electric semiconductors, as pigment, particularly in coloring glass, in alloys, in printing fabrics and banknotes, catalyst for organic and inorganic reactions. Used in dyeing polymers, ... colorant for latex paints.

Is Chromia hazardous?

Chromia carries the GHS signal word "Danger". Main hazards: harmful if swallowed, may cause an allergic skin reaction, causes serious eye irritation. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Chromia?

Chromia is usually classified under HS code 281990 (Chromium oxides and hydroxides, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Chromia?

CompoundList lists 102 suppliers of Chromia in United States, China, India, United Kingdom and 20 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Chromia in India?

14 suppliers in India list Chromia on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Chromia?

Suppliers quote Chromia on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Chromia

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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