1. IDENTIFICATION
Product Name: Thorium Dioxide
Synonyms: Thorium oxide, thoria
CAS Number: 1314-20-1
Molecular Formula: ThO₂
Recommended Use: Laboratory chemical; industrial manufacturing
Supplier:
IBI Labs
3495 N. Dixie Hwy., Unit 8
Boca Raton, FL 33431, USA
Phone: 561-826-0061
Emergency Contact:
INFOTRAC (24 hr)
USA/Canada: 1-800-535-5053
International: 1-352-323-3500
2. HAZARD(S) IDENTIFICATION
GHS Classification
Acute Toxicity (Oral, Dermal, Inhalation) – Category 3
Carcinogenicity – Category 1B
Specific Target Organ Toxicity (Repeated Exposure) – Category 2
Signal Word
Danger
Hazard Statements
Toxic if swallowed, in contact with skin, or if inhaled
May cause cancer
May cause damage to organs through prolonged or repeated exposure
Pictograms
Precautionary Statements
Prevention:
Obtain special instructions before use
Do not handle until safety precautions are understood
Avoid breathing dust
Use only in well-ventilated areas
Wear protective gloves, clothing, and respiratory protection
Response:
IF SWALLOWED: Call poison center immediately
IF ON SKIN: Wash with soap and water
IF INHALED: Move to fresh air
IF exposed: Get medical attention
Storage:
Store locked up in a well-ventilated place
Disposal:
Dispose in accordance with local, state, and federal regulations
Other Hazards:
Radioactive material
3. COMPOSITION / INFORMATION ON INGREDIENTS
| Component | CAS Number | Concentration |
| Thorium Dioxide | 1314-20-1 | ≥ 99% |
4. FIRST-AID MEASURES
General: Seek medical attention. Show SDS to physician.
Inhalation: Move to fresh air. Provide artificial respiration if needed.
Skin Contact: Wash thoroughly with soap and water. Remove contaminated clothing.
Eye Contact: Rinse cautiously with water for at least 15–20 minutes.
Ingestion: Rinse mouth. Do not induce vomiting. Seek immediate medical help.
5. FIRE-FIGHTING MEASURES
Suitable Extinguishing Media:
Water spray, foam, dry chemical, or CO₂
Hazards:
May produce metal oxide fumes
Protective Equipment:
Self-contained breathing apparatus (SCBA)
6. ACCIDENTAL RELEASE MEASURES
Personal Precautions:
Avoid dust formation
Use respiratory protection
Ensure adequate ventilation
Environmental Precautions:
Prevent release to environment
Do not allow into drains
Cleanup:
Avoid dust generation
Collect using appropriate containers
7. HANDLING AND STORAGE
Handling:
Avoid inhalation and contact
Use appropriate ventilation
Storage:
Keep tightly closed
Store in dry, well-ventilated area
Store locked up
8. EXPOSURE CONTROLS / PERSONAL PROTECTION
Exposure Limits:
No established OSHA PEL
Engineering Controls:
Local exhaust ventilation recommended
PPE:
Eye protection: Safety glasses or face shield
Skin: Chemical-resistant gloves
Respiratory: NIOSH-approved respirator (N100/P3 or supplied air)
Clothing: Protective garments suitable for radioactive materials
9. PHYSICAL AND CHEMICAL PROPERTIES
Appearance: White powder
Molecular Weight: 264.04 g/mol
Density: 9.86 g/cm³
Melting Point: ~3050°C
Boiling Point: ~4400°C
Solubility: Insoluble in water
Stability: Stable under recommended conditions
10. STABILITY AND REACTIVITY
Stable under normal conditions
Avoid dust formation
No known hazardous decomposition under proper use
11. TOXICOLOGICAL INFORMATION
Carcinogenicity: Known human carcinogen (NTP)
Acute Toxicity: Toxic via ingestion, inhalation, and skin contact
Target Organs: May affect organs with repeated exposure
Additional Hazard: Radioactive exposure risk
12. ECOLOGICAL INFORMATION
No data available
Avoid environmental release
13. DISPOSAL CONSIDERATIONS
Dispose as radioactive hazardous waste
Follow all federal (EPA, NRC), state, and local regulations
Use licensed disposal services
14. TRANSPORT INFORMATION
Classification depends on radioactive material regulations
Must comply with DOT, IATA, and IMDG requirements
Proper shipping classification determined case-by-case
15. REGULATORY INFORMATION
SARA 311/312: Acute and chronic health hazard
SARA 313: Thorium dioxide listed
California Prop 65: Cancer warning
State Right-to-Know: Listed in MA, PA, NJ
Other Information
HMIS Rating:
Health: 2*
Flammability: 0
Physical Hazard: 0
NFPA Rating:
Health: 2
Fire: 0
Reactivity: 0
16. OTHER INFORMATION
Copyright © 2015 International Bio-Analytical Industries, Inc.
Permission is granted to make unlimited paper copies for internal use only.
International Bio-Analytical Industries, Inc. requires that recipients of its materials comply with 29 CFR 1910.1200(h), which mandates that employers provide employees with effective information and training regarding hazardous chemicals present in the workplace.
The information contained in this Safety Data Sheet is believed to be accurate as of the date of revision and is provided in good faith. However, this information is intended to serve as a guide only, and recipients are encouraged to exercise independent judgment regarding its accuracy, completeness, and suitability for their specific applications. International Bio-Analytical Industries, Inc., shall not be held liable for any direct or indirect damage resulting from the use of this information.
International Bio-Analytical Industries, Inc. makes no warranties, express or implied, including, but not limited to, warranties of merchantability or 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 sole responsibility of the user.
Revision Date: 03/23/2026
