Thorium Dioxide SDS

Thorium Dioxide

Safety Data Sheet

Revision Date 09/30/2021


Product identifiers

Product Name: Thorium Dioxide

Product Number: T1055-T1056

CAS-No.: 1314-20-1


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

Relevant identified uses of the substance or mixture and uses advised against

Identified Uses: Laboratory chemicals, Manufacture of substances.


Classification of the substance or mixture:

GHS Classification in accordance with 29 CFR 1910 (OSHA HCS)

Acute toxicity, Oral (Category 3), H301

Acute toxicity, Inhalation (Category 3), H331

Acute toxicity, Dermal (Category 3), H311

Carcinogenicity (Category 1B), H350

Specific target organ toxicity – repeated exposure (Category 2), H373

For the full text of the H-Statements mentioned in this Section, see Section 16.

GHS Label elements, including precautionary statements:


Signal word Danger

Hazard statement(s):

H301 + H311 + H331 Toxic if swallowed, in contact with skin, or if inhaled.

H350 May cause cancer.

H373 May cause damage to organs through prolonged, or repeated exposure.

Precautionary statement(s):

P201 Obtain special instructions before use.

P202 Do not handle until all safety precautions have been read and understood.

P260 Do not breathe dust/ fume/ gas/ mist/ vapors/ spray.

P264 Wash skin thoroughly after handling.

P270 Do not eat, drink, or smoke when using this product.

P271 Use only outdoors, or in a well-ventilated area.

P280 Wear protective gloves/protective clothing.

P301 + P310 IF SWALLOWED: Immediately call a POISON CENTER, or doctor/physician.

P302 + P352 IF ON SKIN: Wash with plenty of soap and water.

P304 + P340 IF INHALED: Remove victim to fresh air and keep at rest in a position comfortable for breathing.

P308 + P313 IF exposed or concerned: Get medical advice/attention.

P322 Specific measures (see supplemental first aid instructions on this label).

P330 Rinse mouth.

P361 Remove/Take off immediately all contaminated clothing.

P363 Wash contaminated clothing before reuse.

P403 + P233 Store in a well-ventilated place. Keep container tightly closed.

P405 Store locked up.

P501 Dispose of contents/container to an approved waste disposal plant.

Hazards not otherwise classified (HNOC) or not covered by GHS:




Formula: O2Th

Molecular Weight: 264.04 g/mol

CAS-No.: 1314-20-1

EC-No.: 215-225-1

Component Classification Concentration

Thorium dioxide

Acute Tox. 3; Carc. 1B; STOT

RE 2; H301 + H311 + H331,

H350, H373

For the full text of the H-Statements mentioned in this Section, see Section 16.


Description of first aid measures

General advice:

  • Consult a physician.
  • Show this safety data sheet to the doctor in attendance.
  • Move out of dangerous area.

If inhaled:

  • If breathing, move person into fresh air.
  • If not breathing, give artificial respiration.
  • Consult a physician.

In case of skin contact:

  • Wash off with soap and plenty of water.
  • Take victim immediately to hospital.
  • Consult a physician.

In case of eye contact:

  • Flush eyes with water for at least 20 minutes.
  • Consult a physician.

If swallowed:

  • Never give anything by mouth to an unconscious person.
  • Rinse mouth with water.
  • Consult a physician.

Most important symptoms and effects, both acute and delayed

The most important known symptoms and effects are described in the labelling (see section 2.2), and/or in section 11.

Indication of any immediate medical attention and special treatment needed: No Data Available.


Extinguishing media: Suitable extinguishing media: Use water spray, alcohol-resistant foam, dry chemical, or carbon dioxide.

Special hazards arising from the substance or mixture: Metal oxides.

Advice for firefighters: Wear self-contained breathing apparatus for firefighting if necessary.


Personal precautions, protective equipment, and emergency procedures:

  • Wear respiratory protection.
  • Avoid dust formation, breathing vapors, breathing dust, mist, or gas.
  • Ensure adequate ventilation.
  • Evacuate personnel to safe areas. 
  • For personal protection see section 8.

Environmental precautions:

  • Prevent further leakage or spillage if safe to do so.
  • Do not let product enter drains.

Methods and materials for containment and cleaning up:

  • Pick up and arrange disposal without creating dust.
  • Sweep up and shovel.
  • Keep in suitable, closed containers for disposal.


Precautions for safe handling:

  • Avoid contact with skin and eyes and formation of dust and aerosols.
  • Provide appropriate exhaust ventilation at places where dust is formed. 

Conditions for safe storage, including any incompatibilities:

  • Keep container tightly closed in a dry and well-ventilated place.
  • Keep in a dry place.

Specific end uses: Apart from the uses mentioned in section 1.2, no other specific uses are stipulated.


Control parameters:  Contains no substances with occupational exposure limit values.

Exposure controls:

  • Avoid contact with skin, eyes and clothing.
  • Wash hands before breaks, and immediately after handling the product.

Personal protective equipment

Eye and face protection: Face shield and safety glasses Use equipment for eye protection tested and approved under appropriate government standards such as NIOSH (US) or EN 166(EU).

Skin protection:

  • Handle with gloves.
  • Gloves must be inspected prior to use.
  • Use proper glove removal technique (without touching glove’s outer surface) to avoid skin contact with this product.
  • Dispose of contaminated gloves after use in accordance with applicable laws and good laboratory practices.
  • Wash and dry hands.

Body Protection: Complete suit protecting against chemicals, the type of protective equipment must be selected according to the concentration and amount of the dangerous substance at the specific workplace.

Respiratory protection:

  • Where risk assessment shows air-purifying respirators are appropriate use a full-face particle respirator type N100 (US) or type P3 (EN 143) respirator cartridges as a backup to engineering controls.
  • If the respirator is the sole means of protection, use a full-face supplied air respirator.
  • Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU).

Control of environmental exposure:

  • Prevent further leakage or spillage if safe to do so.
  • Do not let product enter drains.


Information on basic physical and chemical properties

a) Appearance Form: powder Color: white

b) Odor: No Data Available.

c) Odor Threshold: No Data Available.

d) pH: No Data Available.

e) Melting point/freezing point: No Data Available.

f) Initial boiling point and boiling range: No Data Available.

g) Flash point: No Data Available.

h) Evaporation rate: No Data Available.

i) Flammability (solid, gas): No Data Available.

j) Upper/lower flammability or explosive limits: No Data Available.

k) Vapor pressure: No Data Available.

l) Vapor density: No Data Available.

m) Relative density: No Data Available.

n) Water solubility: No Data Available.

o) Partition coefficient: noctanol/water: No Data Available.

p) Auto-ignition temperature: No Data Available.

q) Decomposition temperature: No Data Available.

r) Viscosity: No Data Available.

s) Explosive properties: No Data Available.

t) Oxidizing properties: No Data Available.

Other safety information: No Data Available.


Reactivity: No Data Available.

Chemical stability: Stable under recommended storage conditions.

Possibility of hazardous reactions: No Data Available.

Conditions to avoid: No Data Available.

Incompatible materials: No Data Available.

Hazardous decomposition products

Other decomposition products: No Data Available.

In the event of fire: See section 5.


Information on toxicological effects

Acute toxicity: No Data Available.

Skin corrosion/irritation: No Data Available.

Serious eye damage/eye irritation: No Data Available.

Respiratory or skin sensitization: No Data Available.

Germ cell mutagenicity


Possible human carcinogen.

IARC: No component of this product present at levels greater than or equal to 0.1% is identified as probable, possible, or confirmed human carcinogen by IARC.

ACGIH: No component of this product present at levels greater than or equal to 0.1% is identified as a carcinogen or potential carcinogen by ACGIH.

NTP: Known to be human carcinogen (Thorium dioxide).

OSHA: No component of this product present at levels greater than or equal to 0.1% is identified as a carcinogen or potential carcinogen by OSHA.

Reproductive toxicity

No Data Available.

Specific target organ toxicity – single exposure: No Data Available.

Specific target organ toxicity – repeated exposure: May cause damage to organs through prolonged or repeated exposure.

Aspiration hazard

No Data Available.

Additional Information

RTECS: No Data Available.

To the best of our knowledge, the chemical, physical, and toxicological properties have not been thoroughly investigated.

Stomach: Irregularities based on Human Evidence.


Toxicity: No Data Available.

Persistence and degradability: No Data Available.

Bioaccumulative potential: No Data Available.

Mobility in soil: No Data Available.

Results of PBT and vPvB assessment: PBT/vPvB assessment not available as chemical safety assessment not required/not conducted.

Other adverse effects: No Data Available.


Waste treatment methods

Product: Contact a licensed professional waste disposal service to dispose of this material. After use, follow local procedures for radioactive waste. Consult local, state, and federal regulations on the disposal of radioactive waste. Observe all federal, state, and local environmental regulations.

Contaminated packaging: Dispose of as unused product.


The U.S. Department of Transportation (D.O.T.) Code of Federal Regulations (49 CFR Parts 100-185), the International Air Transportation Association (IATA), International Civil Aviation Organization (ICAO) and International Maritime Organization (IMDG) are all factored into the classification and transport of material.

Proper Shipping Name:

Hazard Class:

UN/ID Number:                                                                  To be determined on a case-by-case basis.

Special Information:

Packing Group:

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


SARA 302 Components

SARA 302: No chemicals in this material are subject to the reporting requirements of SARA Title III, Section 302.

SARA 313 Components

The following components are subject to reporting levels established by SARA Title III, Section 313:

Thorium dioxide

CAS-No. 1314-20-1

Revision Date 1993-04-24

SARA 311/312 Hazards

Acute Health Hazard, Chronic Health Hazard.

Massachusetts Right to Know Components

Thorium dioxide

CAS-No. 1314-20-1

Revision Date 1993-04-24

Pennsylvania Right to Know Components

Thorium dioxide

CAS-No. 1314-20-1

Revision Date 1993-04-24

New Jersey Right to Know Components

Thorium dioxide

CAS-No. 1314-20-1

Revision Date 1993-04-24

California Prop. 65 Components

WARNING! This product contains a chemical known to the State of California to cause cancer.

Thorium dioxide

CAS-No. 1314-20-1

Revision Date 2007-09-28


Full text of H-Statements referred to under sections 2 and 3.

Acute Tox. Acute toxicity.

Carc. Carcinogenicity.

H301 Toxic if swallowed.

H301 + H311 +H331.

Toxic if swallowed, in contact with skin, or if inhaled.

H311 Toxic in contact with skin.

H331 Toxic if inhaled.

H350 May cause cancer.

HMIS Rating

Health hazard: 2.

Chronic Health Hazard: *.

Flammability: 0.

Physical Hazard 0.

NFPA Rating

Health hazard: 2.

Fire Hazard: 0.

Reactivity Hazard: 0.

Further information

Copyright 2014 IBI Labs. License granted to make unlimited paper copies for internal use only.

The above information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. The information in this document is based on the present state of our knowledge and is applicable to the product with regard to appropriate safety precautions. It does not represent any guarantee of the properties of the product. IBI Labs and its Affiliates shall not be held liable for any damage resulting from handling or from contact with the above product.

Revision Date: 09/30/2021


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