Thorium Hydroxide SDS


Product Identifier

Name: Thorium Hydroxide

Synonyms: Thorium Tetrahydroxide

Formula: Th(OH)4



IBI Labs

3495 N. Dixie Hwy. Unit # 8

Boca Raton, FL 33431

Tel: 561-826-0061 Fax: 561-892-8450

Emergency Telephone Numbers


USA & Canada contact number: 1-800-535-5053

International contact number: 1-352-323-3500


  • Molecular Formula: H4O4Th
  • Molecular Weight: 300.068
  • Properties: Prepared by the addition of alkali to a solution of Th++++ salt, yielding a gelatinous precipitate which is subsequently dehydrate; absorbs CO2 to form ThOCO3 [KIR83]
  • Melting Point, °C: Decomposes
  • Reactions: Minus water >470 °C to form ThO2 [KIR83]


CAS RN: [13825-36-0]

NIH PubChem CID: 3014786

EC (EINECS/ELINCS): 237-522-5

UN (DOT): 2910

Beilstein/Gmelin: 101085 (G)



  • Keep in a cool, dry, dark location, in a tightly sealed container or cylinder.
  • Keep away from incompatible materials, ignition sources, and untrained individuals.
  • Secure and label area.
  • Protect containers/cylinders from physical damage.


  • All chemicals should be considered hazardous.
  • Avoid direct physical contact.
  • Use appropriate approved safety equipment.
  • Untrained individuals should not handle this chemical or its container.
  • Handling should occur in a chemical fume hood.

Protection: Wear appropriate protective gloves, clothing, and goggles.

Respirators: Wear positive pressure self-contained breathing apparatus (SCBA).

Small spills and leaks:

  • Do not touch damaged packages or spilled material.
  • Cover liquid spill with sand, earth, or other noncombustible absorbent material.
  • Cover the powder spill with a plastic sheet or tarp to minimize spreading.
  • Contact the radiation safety officer.


The presence of radioactive material will not affect the fire control procedures and technique selection.

  • Small fires: Dry chemical, carbon dioxide, water spray, or regular foam.
  • Large fires: Water spray, fog (flooding amounts).

Fire potential: May burn but does not ignite readily.


Exposure Effects

Ingestion, skin, and eyes: See inhalation.


  • There is minimal risk if the packaging remains intact.
  • Package damage can result in a measurable release of radiation, but the risk is still low.

First Aid

General advice: In the case of an accident or if you feel unwell, seek medical advice immediately.


  • Apply artificial respiration if the patient is not breathing.
  • Administer oxygen if breathing is difficult.
  • See Ingestion.

Skin and eyes:

  • Immediately flush with running water for at least 20 minutes.
  • See Ingestion.


  • Medical problems take priority over radiological concerns.
  • Use first aid treatment according to the nature of the injury.
  • Do not delay the care and transport of a seriously injured person.


Engineering measures: Ensure adequate ventilation.

Personal Protective Equipment

At any detectable concentration: Any self-contained breathing apparatus with a full facepiece operated in a pressure-demand or other positive-pressure mode.

Any supplied-air respirator with a full facepiece operated in a pressure-demand or other positive-pressure mode or other positive-pressure mode with an auxiliary self-contained breathing apparatus operated in pressure-demand or other positive-pressure mode.

Escape – any air-purifying, full-facepiece respirator with a high-efficiency particulate filler.

Any appropriate escape-type, self-contained breathing apparatus.

Respiratory protection: Breathing apparatus only if aerosol or dust is formed.

Hand protection: PVC or other plastic material gloves

Skin and body protection: Usual safety precautions while handling the product will provide adequate protection against this potential effect.

Eye protection: Safety glasses with side-shields

Hygiene measures: Handle following good industrial hygiene and safety practices.

Clothing: Employees handling radioactive substances should wear disposable overgarments, including head and foot coverings. These garments are also recommended even if the employee uses a “glove box” containment system. Certain clothing fibers may be useful in dosimetry so clothing should be kept.

Gloves: The selection of appropriate gloves depends on the material, while the quality standards may vary among manufacturers.

Firefighting and Other Immediately Dangerous to Life or Health Conditions

Use any self-contained breathing apparatus with a full facepiece respirator and a high-efficiency particulate filter.

Use any supplied air respirator with a full facepiece operated in a pressure-demand or other positive-pressure mode or other positive-pressure modes with an auxiliary self-contained breathing apparatus operated in pressure-demand or other positive-pressure modes.


Waste from residues/unused products: Waste disposal must follow appropriate Federal, State, and local regulations. If unaltered, this product may be disposed of by treatment at a permitted facility or as advised by your local hazardous waste regulatory authority. Residue from fires extinguished with this material may be dangerous.

Contaminated packaging: Do not reuse empty containers and dispose of them as unused products.

Recommendations: Should not be disposed of with household garbage.


UN Number: 2910

Response Guide: 161

Hazard Class: 7

Packing Group:

The classification of substances with multiple hazards must be determined following the criteria presented in the regulations mentioned above. Due to the various quantities and combinations of materials being shipped at one time, the information above must be determined based on the characteristics of the specific shipment.


IBI Labs requires that those who receive their materials comply with 29 CFR 1910.1200(h), which mandates that employers provide employees with effective information and training about hazardous chemicals in their workplace.

The contents of this document are believed to be accurate as of the date of revision and are provided in good faith. However, it is recommended that recipients use this information as supplementary and exercise caution and judgment regarding its accuracy and suitability. Please note that IBI Labs cannot be held responsible for any damage, direct or indirect, that occurs because of using the information provided in this Safety Data Sheet.

IBI Labs makes no warranties, expressed or implied, including warranties of merchantability and fitness for a particular purpose. This information is provided without warranty, and any use of the product that does not conform to this Safety Data Sheet, or that is used in combination with any other product or process, is the user’s responsibility.

Revision Date: 07/10/2024


    Contact Form

      Your Name (required)

      Your Email (required)

      Please confirm your email (required)

      Your Job/Discipline

      Employer/Work Location


      Phone (required)


      Your Message