United Nuclear Scientific
16429 Upton Rd, Ste 1, East Lansing, MI. 48823
Phone: 517-339-3587

Material Safety Data Sheet

Uranium Dioxide

Section 01 Identification

Date Effective.......... January 1, 2015
(most recent revision)

Chemical Name/Synonyms.. Uranium oxide


Contacting CHEMTREC 24 Hour Emergency
Use Only #'s... Worldwide phone : 1-(703)-527-3887
Worldwide FAX : 1-(703)-741-6090
Toll-free phone : 1-(800)-424-9300 USA only

Product or Trade Name.... Uranium Dioxide, Uranium Oxide
CAS #.................... 1344-57-6 NIOSH (RTECS) No: 1010387US Chemical Formula......... UO2

Section 2 Composition

Uranium Dioxide: 99.9%

NFPA Rating: Not known

Section 3: Hazard Identification

Emergency overview:
Special Hazard Precautions:
In some states of this material, it can be extremely flammable,
may be pyrophoric. It is radioactive.

Kidney damage, arterial lesions and possible liver effects.
May irritate eyes and skin. Toxic if inhaled. Irritating to
lungs. May cause kidney damage. arterial lesions, and liver

Dermatitis. Possible carcinogen of lymphatic and blood-forming tissue.

Signal Word


Physical Health Hazards:
Harmful by inhalation, in contact with the skin and if swallowed.
Personal protection:
Wear approved protective clothing when working with this material
in order to avoid any contact with material at all. Long sleeves
and/or lab coat are recommended to protect against skin contact.
Approved chemical goggles are recommended to protect against eye
contact. Respiratory Protection: NIOSH/MSHA Approved high
efficiency particle respirator. Use rubber gloves for hand protection.
Physical state:
Solid chunks or fines associated with the chunks
Color: Dark brown to black chips, with some associated "fines"

Odor: None

Odor threshold: No data available

Potential Health Effects:
Routes of exposure Inhalation of the fine powder, skin, eye
Signs and Symptoms of Acute Exposure:
May cause kidney damage and acute necrotic arterial lesions.
May also effect liver function.

Skin: May cause irritation

Eye: May cause irritation

Inhalation: Considered toxic by inhalation due to lung
irritation from inhaled fine particles from the
"dust" that is always present. May also cause
kidney damage and acute necrotic arterial lesions.
Liver effects might be present as well.

Chronic Health Effects Summary:
Skin: May cause dermatological problems.
Conditions Aggravated by Exposure:
None known.
Signs and Symptoms of Overexposure:
Precise health hazards are not known. But chronic radiation
effects are similar to those of ionizing radiation. It is reported that carcinogenicity is related to dose and exposure time. Uranium may cause cancer of lymphatic and blood-forming tissues.

Section 4: First Aid Measures

Take proper precautions to ensure your own health and safety before
attempting to rescue and providing first aid. For specific information
refer to the Emergency Overview in Section of this MSDS.

Inhalation: No specific information is available, but one should
contact medical help at once.

Eye Contact: Wash eyes, including under lids, with copious amounts
low-pressure water, for minimum of 15 minutes, removing contact lenses if
possible. Then seek medical advice from a qualified physician.

Skin Contact: Remove contaminated clothing, then rinse skin thorough
with large amounts of soap and water to remove all traces of the substance.
If irritation persists, contact qualified medical assistance.

Ingestion: Adverse health effects due to ingestion are to be expected,
but exactly what are these health effects are not known. Wash out mouth with
water but never give liquids to an unconscious person. Call a physician at
once and seek other medical attention.

Section 5: Fire Fighting Measures


NFPA Rating: Not known

Flammability classification:

Not known.

Flash Point/Method: Not applicable

Auto-Ignition Temperature: Not known

Flammable Limits: Lower: Not applicable
Upper: Not applicable

Hazardous Combustion Products:
Not known.
Special Conditions to Avoid:
None specifically known.
Extinguishing Media:
Fires: Material is flammable and may be pyrophoric. Do not use
water, use dry chemical extinguishing agents.
Fire Fighting Instructions:
Protective Equipment/Clothing: Wear a NIOSH approved positive
pressure self-contained breathing apparatus and firefighter
turnout gear. Wear long sleeves and chemical goggles for eye
Instructions: Use flooding quantities of water until well after
fire is out. If the product now wet with water starts to migrate
to other areas or even to the outside environment, dike it at once
to prevent that from happening. Keep moist to prevent a dust
hazard from starting.
Material could be spontaneously flammable in air, remove material
form the area of the fire if without risk.

Section 6: Accidental Release Measures

Release response:
Wear NIOSH approved respirator, chemical safety goggles,
rubber boots, and heavy rubber gloves. Sweep up wet product,
place in a bag and hold for waste disposal. If product is
tending to flow away from fire or spill area, try to dike the
material to keep in one place. If a broom is used, remember
that the broom, when dried out, will contain powder of the
product and if the broom is put into continued use without proper
cleaning, then a hazardous dust cloud could be created. Ventilate
area and wash spill site after pick up is complete.
Reportable Quantities:
See Section 15: Regulatory information.

Section 7: Handling and Storage

Use full protective gear as described above. Respiratory Protection: NIOSH/MSHA Approved high efficiency particle
Keep container dry. Store away from excessive heat. Keep container closed to prevent contamination.

Section 8: Exposure Controls and Personal Protection

Engineering Controls: If user operations generate dust or fumes,
ventilate area to prevent accumulation.

Personal Protection:
Inhalation: Use appropriate respiratory protection at all times. If product is to be used as part of a vacuum deposition process, we would recommend that all vacuum pumps be vented to the outdoors, in order to avoid any possible release of uranium compounds into the laboratory environment. Respiratory Protection: NIOSH/MSHA Approved high efficiency
particle respirator.
Skin: Protective clothing such as long sleeves or a lab coat should always be worn. Eye: Always use chemical goggles, even for work with small quantities, such as the loading of a tungsten basket or boat prior to making a deposition of the material.

Section 9: Physical and Chemical Properties

Boiling Point/Range: Not applicable

pH: Not applicable

Vapor Pressure: Not applicable

Viscosity: Not applicable

Specific Gravity (Water = 1): 10.95

Water solubility: Not soluble

Octanol/Water Partition Coefficient in Kow: Specific value not known

Melting/Freezing Point: > 2868C (5194F) [from literature]

Evaporation Rate: Not applicable

Vapor Density (Air=1): Not applicable

Section 10: Stability and Reactivity

Chemical Stability: The product is stable except for its radioactive
disintegration. Half life for uranium 238, by far the most common isotope,
is over 1,000,000 years.

Conditions to Avoid: Exposure to water

Incompatibility with: Water

Hazardous Products of Deposition: Not known

Reactions with Air and Water: Does slowly react with moisture and in the
highly dried state, is pyrophoric and would react in air. However as the
product is shipped from SPI Supplies, material is not pyrophoric.

Section 11: Toxicological Information

Considered to be highly toxic to humans and animals.
Uranium Dioxide (UO2)

OSHA PEL: 0.2mg/m3 0.6 STEL(U)
ACGIH TLV: 0.2mg/m3 0.6 STEL(U)

Carcinogenicity - NTP: NO
Carcinogenicity - IARC: NO
Carcinogenicity - OSHA: NO

Skin Effects:
May be harmful, full extent of effects is not known. Acute Oral Effects:
May be harmful but the full effects of such ingestion have not been determined.
Acute Inhalation Effects:
May be harmful but the full effects of such inhalation exposure have not been

Subchronic Effects: Not known.

Chronic Effects/Carcinogenicity:
Not known.

Reproductive/Development Effects:
Not known.

The full impact of the chemical, physical, and toxicological properties of
this product have not been thoroughly studied and determined.

Section 12: Ecological Information

Exotoxicity: No information found in our selected references.

Environmental Fate: No information found in our selected references.

Bioaccumulation: No information found in our selected references.

Section 13: Disposal Considerations

Bury in an approved land fill site approved for the disposal of chemical
and hazardous wastes.

Section 14: Transport Information

Proper Shipping Name: Uranium (IV) Oxide

DOT Hazard Class: Radioactive Class 7


Packing Group: _______

Marine Pollutant: Not known

NAER Guidebook: Not known

Section 15: Regulatory Information

TSCA: All components of this product are listed on the TSCA 8(b)
inventory. If identified components of this product are listed
under the TSCA 12(b) Export Notification Rule, they will be listed

TSCA 12(b) Component Listed under TSCA Section

SARA Title 3: Section 313 Information/Emissions Reporting (40 CFR 372):

Component Reporting Threshold
Uranium oxide

SARA-Section 311/312: No components present in this product are subject
to the reporting requirements of this statute.

California Prop. 65:
Proposition 65 requires manufacturers or distributors of consumer products
into the State of California to provide a warning statement if the product
contains ingredients for which the State has found to cause cancer, birth
defects or other reproductive harm. If this product contains an ingredient
listed by the State of California to cause cancer or reproductive toxicity,
it will be listed below:
Uranium (IV) oxide

Section 16: Other Information

Disclaimer of Liability:
The information and recommendations set forth above are taken from sources
believed to be accurate as of the date hereof,
however United Nuclear Scientific Supplies, LLC. makes no warranty with respect
to the accuracy of the information or the
suitability of the recommendations, and assume no liability to any user
thereof. The information contained in this sheet does not
constitute a hazard assessment and should not be used in place of the user's
own assessment of work place risks as required by
other health and safety legislation.