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Oxides and peroxides

Uranium oxide (UO2)

Also known as Uranous oxide, Brown oxide, Black uranium oxide

CAS 1344-57-6Formula O2UMolar mass 270.03 g/molEC 215-700-3
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Serious health hazard, Hazardous to the environment 3 suppliers listed
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Uranium oxide (UO2) chemical structure, O2U, CAS 1344-57-6
2D chemical structure

Key facts

What buyers check first

All properties
Physical form
Crystals
Melting point
2,847 °C
Density
Relative density (water = 1): 11.0
Solubility
Solubility in water: none
HS code
284410
Category
Oxides and peroxides
Illustrative photo, drums, an IBC tote and sacks in a chemical warehouse in a warehouse
Typical packagingIllustrative packaging image, not the actual product

What is Uranium oxide (UO2)?

Plain description, key identifiers and synonyms

Uranium oxide (UO2) is a chemical substance with the molecular formula O2U and a molar mass of 270.03 g/mol. Its CAS registry number is 1344-57-6. The IUPAC name is bis(oxygen(2-)), uranium(4+).

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
bis(oxygen(2-)), uranium(4+)
CAS number
1344-57-6 CAS number cross-checked
EC number
215-700-3
Molecular formula
O2U
UNII
L70487KUZO
InChIKey
OOAWCECZEHPMBX-UHFFFAOYSA-N
InChI
InChI=1S/2O.U/q2*-2;+4
SMILES (canonical and isomeric)
[O-2].[O-2].[U+4]

Synonyms

  • Uranous oxide
  • Brown oxide
  • Black uranium oxide
  • dioxouranium
  • Uranium dioxide
  • Uranium(IV) oxide
  • Uranium(4+) dioxide

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

Physical form
Crystalsexp.
Melting point
2,847 °Cexp.
Density
Relative density (water = 1): 11.0exp.
Solubility
Solubility in water: noneexp.

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
270.03 g/molcalc.
Exact mass
270.0406 Dacalc.
LogP (octanol/water)
-0.24calc.
Topological polar surface area
57 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
3calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
Components
3calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H300 + H330Fatal if swallowed. Fatal if inhaled.
  • H300Fatal if swallowed.
  • H330Fatal if inhaled.
  • H373May cause damage to organs through prolonged or repeated exposure.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
  • H411Toxic to aquatic life with long lasting effects.
Precautionary statements (17)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P316Get emergency medical help immediately.
  • P319Get medical help if you feel unwell.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • 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

Uranium oxide (UO2) suppliers

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

All 3 suppliers

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

3 suppliers in 3 countries

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Uranium oxide (UO2) price

Indicative price range per kg from live supplier offers

No published prices right now

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Uses and applications

What the substance is used for, by industry and function

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

Regulatory status

Inventories, regulations and trade controls that list this substance

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 Uranium oxide (UO2) is traded under.

HS 2844.10Indicative HS code

Natural uranium and its compounds, alloys, dispersions (including cermets), ceramic…

World exports in 2024
$7.66B
+47.4% vs 2023, imports $7.29B
2019 to 2024
Top exporters
  1. Canada42.9%
  2. Kazakhstan * partner reported27.8%
  3. United States12.6%
Top importers
  1. China31.8%
  2. United States21.6%
  3. Netherlands17.7%

* Partner reported figures, a lower bound.

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

The HS code shown for Uranium oxide (UO2) is indicative (it is known at chapter level only). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Uranium oxide (UO2), based on the data on this page

What is Uranium oxide (UO2)?

Uranium oxide (UO2) is a chemical substance with the molecular formula O2U and a molar mass of 270.03 g/mol. Its CAS registry number is 1344-57-6. The IUPAC name is bis(oxygen(2-)), uranium(4+).

What is the CAS number of Uranium oxide (UO2)?

The CAS registry number of Uranium oxide (UO2) is 1344-57-6.

What is the molecular formula and weight of Uranium oxide (UO2)?

The molecular formula of Uranium oxide (UO2) is O2U and its molar mass is 270.03 g/mol.

Is Uranium oxide (UO2) hazardous?

Uranium oxide (UO2) carries the GHS signal word "Danger". Main hazards: fatal if swallowed. fatal if inhaled, fatal if swallowed, fatal if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Uranium oxide (UO2)?

Uranium oxide (UO2) is usually classified under HS code 284410 (Natural uranium and its compounds, alloys, dispersions (including cermets), ceramic…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Uranium oxide (UO2)?

CompoundList lists 3 suppliers of Uranium oxide (UO2) in India, Nigeria and United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

Where can I buy Uranium oxide (UO2) in India?

1 supplier in India list Uranium oxide (UO2) on CompoundList. Filter the suppliers list by country and send a request to compare prices, grades and delivery times.

What is the price of Uranium oxide (UO2)?

Suppliers quote Uranium oxide (UO2) 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 Uranium oxide (UO2)

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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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