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Oxides and peroxides

Uranium trioxide

Also known as Uranium oxide, Urane, Uranium oxide (UO3)

CAS 11113-93-2Formula O3UMolar mass 286.03 g/molEC 215-701-9
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Serious health hazard, Hazardous to the environment 2 suppliers listed
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Uranium trioxide chemical structure, O3U, CAS 11113-93-2
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
11113-93-2
Formula
O3U
Molar mass
286.03 g/mol
Density
7.3 @25 °C
HS code
284410
Category
Oxides and peroxides

What is Uranium trioxide?

Plain description, key identifiers and synonyms

Uranium trioxide is an oxide of uranium.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
trioxouranium
CAS number
11113-93-2Other or deprecated CAS: 1344-58-7
EC number
215-701-9
Molecular formula
O3U
UNII
Q47SFG7DIQ
InChIKey
JCMLRUNDSXARRW-UHFFFAOYSA-N
InChI
InChI=1S/3O.U
SMILES (canonical and isomeric)
O=[U](=O)=O

Synonyms

  • Uranium oxide
  • Urane
  • Uranium oxide (UO3)
  • Uranic oxide
  • uranium oxides
  • Orange oxide
  • Uranyl oxide
  • Red uranium oxide
  • Dihydrate uranium
  • uranium oxide (U-O3)
  • C.I. 77917
  • JAERI U 2
  • Uranium(VI) oxide
  • trioxouranium
  • Tris(oxido)uranium
  • Uranium(VI) oxide, red

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

Density
7.3 @25 °Cexp.

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
286.03 g/molcalc.
Exact mass
286.0355 Dacalc.
LogP (octanol/water)
-0.36calc.
Topological polar surface area
51.21 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
0calc.
Heavy atoms
4calc.
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
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.
  • 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 trioxide suppliers

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All 2 suppliers

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Where suppliers are based

2 suppliers in 1 country

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Uranium trioxide 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

Industries and functions

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 trioxide 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 trioxide 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 trioxide, based on the data on this page

What is Uranium trioxide?

Uranium trioxide is an oxide of uranium.

What is the CAS number of Uranium trioxide?

The CAS registry number of Uranium trioxide is 11113-93-2. Other or deprecated CAS numbers: 1344-58-7.

What is the molecular formula and weight of Uranium trioxide?

The molecular formula of Uranium trioxide is O3U and its molar mass is 286.03 g/mol.

What is Uranium trioxide used for?

Known uses and roles of Uranium trioxide include pigments in paints and coatings.

Is Uranium trioxide hazardous?

Uranium trioxide 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 trioxide?

Uranium trioxide 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 trioxide?

CompoundList lists 2 suppliers of Uranium trioxide in United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Uranium trioxide?

Suppliers quote Uranium trioxide 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 trioxide

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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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