1. IDENTIFICATION
Product name: Thorium Nitrate Tetrahydrate
Synonyms: Thorium(IV) nitrate tetrahydrate; Thorium nitrate
Chemical formula: Th(NO₃)₄·4H₂O
CAS number: 13470-07-0
EC number: 237-514-1
Recommended use: Laboratory chemical; research and manufacture of substances
Restrictions on use: Radioactive material. For trained personnel only.
Supplier:
International Bio-Analytical Industries, Inc.
3495 N. Dixie Hwy., Unit 8
Boca Raton, FL 33431 USA
Tel: +1 561-826-0061
Fax: +1 561-892-8450
Emergency telephone:
INFOTRAC (USA & Canada): +1-800-535-5053
INFOTRAC (International): +1-352-323-3500
2. HAZARD(S) IDENTIFICATION
Classification (OSHA HCS 2012 / GHS):
Oxidizing solid, Category 2 (H272)
Acute toxicity (oral), Category 4 (H302)
Skin irritation, Category 2 (H315)
Eye irritation, Category 2A (H319)
Specific target organ toxicity – single exposure, Category 3 (H335)
Specific target organ toxicity – repeated exposure, Category 2 (H373)
Hazardous to the aquatic environment, acute, Category 2 (H401)
Hazardous to the aquatic environment, chronic, Category 2 (H411)
Pictogram
Signal word: Danger
Hazard statements:
H272 May intensify fire; oxidizer.
H302 Harmful if swallowed.
H315 Causes skin irritation.
H319 Causes serious eye irritation.
H335 May cause respiratory irritation.
H373 May cause damage to organs through prolonged or repeated exposure.
H401 Toxic to aquatic life.
H411 Toxic to aquatic life with long-lasting effects.
Precautionary statements:
P220 Keep away from clothing and other combustible materials.
P261 Avoid breathing dust or mist.
P264 Wash thoroughly after handling.
P270 Do not eat, drink, or smoke when using this product.
P273 Avoid release to the environment.
P280 Wear protective gloves, clothing, eye, and face protection.
P301 + P312 IF SWALLOWED: Call a POISON CENTER or physician if you feel unwell.
P302 + P352 IF ON SKIN: Wash with plenty of water.
P304 + P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P305 + P351 + P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses if present.
P370 + P378 In case of fire: Use water spray to extinguish.
P391 Collect spillage.
P405 Store locked up.
P501 Dispose of contents and container in accordance with applicable regulations.
Hazards not otherwise classified: Radioactive thorium isotopes.
3. COMPOSITION/INFORMATION ON INGREDIENTS
Component: Thorium nitrate tetrahydrate
CAS No.: 13470-07-0
Concentration: ≥ 99%
Classification: Ox. Sol. 2; Acute Tox. 4; Skin Irrit. 2; Eye Irrit. 2A; STOT SE 3; STOT RE 2; Aquatic Acute 2; Aquatic Chronic 2
4. FIRST-AID MEASURES
General advice: Seek medical attention. Show this SDS to medical personnel.
Inhalation: Move to fresh air. If symptoms persist, seek medical attention.
Skin contact: Wash immediately with soap and plenty of water. Remove contaminated clothing.
Eye contact: Rinse cautiously with water for at least 15 minutes. Seek medical attention.
Ingestion: Rinse mouth. Do not induce vomiting. Seek medical attention.
Most important symptoms/effects: Respiratory irritation, gastrointestinal effects, delayed radiation-related effects.
5. FIRE-FIGHTING MEASURES
Suitable extinguishing media: Use water spray or flooding quantities of water.
Specific hazards: Strong oxidizer. Decomposition produces nitrogen oxides and thorium oxides.
Protective equipment: Firefighters must wear self-contained breathing apparatus and full protective clothing.
6. ACCIDENTAL RELEASE MEASURES
Personal precautions: Evacuate area. Avoid dust formation. Wear appropriate PPE.
Environmental precautions: Prevent release to drains, soil, and surface waters.
Cleanup methods: Collect material by wet methods or HEPA-filtered vacuum. Place in sealed containers for radioactive hazardous waste disposal.
7. HANDLING AND STORAGE
Handling: Avoid contact with combustible materials. Avoid dust generation. Use adequate ventilation.
Storage: Store locked up in a cool, dry, well-ventilated area away from combustibles.
8. EXPOSURE CONTROLS/PERSONAL PROTECTION
Exposure limits (as thorium):
OSHA PEL (TWA): 0.05 mg/m³
ACGIH TLV (TWA): 0.05 mg/m³
NIOSH REL (TWA): 0.05 mg/m³
Engineering controls: Local exhaust ventilation and radiological controls.
Personal protective equipment:
Eye protection: Safety glasses with side shields or face shield.
Skin protection: Chemical-resistant gloves (nitrile) and protective clothing.
Respiratory protection: NIOSH-approved full-face respirator with P100/N100 cartridges or supplied-air respirator when required.
Full and Splash Contact
Material: Nitrile rubber.
Minimum layer thickness: 0.11 mm.
Break-through time: 480 min.
Material tested: Dermatril® (KCL 740 / Aldrich Z677272, Size M).
If used in solution, or mixed with other substances, and under conditions that differ from EN 374, contact the supplier of the CE-approved gloves. This recommendation is advisory only and must be evaluated by an industrial hygienist and safety officer familiar with the specific situation of anticipated use by our customers. It should not be construed as offering approval for any specific use scenario.
9. PHYSICAL AND CHEMICAL PROPERTIES
Appearance: White crystalline solid
Solubility: Soluble in water
Odor: Odorless
Melting point: Decomposes ~500 °C
Oxidizing properties: Strong oxidizer
10. STABILITY AND REACTIVITY
Stability: Stable under recommended storage conditions.
Reactivity: Strong oxidizing agent.
Incompatible materials: Combustible materials, organic materials, reducing agents.
11. TOXICOLOGICAL INFORMATION
Acute toxicity: LD₅₀ (oral, mouse): ~1,760 mg/kg
Carcinogenicity: IARC: Group 2A – Probably carcinogenic to humans (thorium compounds).
Reproductive toxicity: Evidence of reproductive effects in animal studies.
STOT: May cause respiratory irritation and organ damage with repeated exposure.
12. ECOLOGICAL INFORMATION
Toxic to aquatic life with long-lasting effects. Bioaccumulation potential present.
13. DISPOSAL CONSIDERATIONS
Dispose of material as radioactive hazardous waste through a licensed disposal contractor in accordance with federal, state, and local regulations.
14. TRANSPORT INFORMATION
Transport classification depends on quantity, physical form, and regulatory jurisdiction. Material may be regulated as radioactive, oxidizing, and toxic. Determine shipping requirements prior to transport.
Proper Shipping Name:
Hazard Class:
UN/ID Number: To be determined on a case-by-case basis.
Special Information:
Packing Group:
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.
15. REGULATORY INFORMATION
OSHA Hazard Communication: Hazardous
SARA 311/312: Acute health hazard, chronic health hazard, reactivity hazard
SARA 313: Thorium nitrate compounds subject to reporting
State Right-to-Know: Listed (MA, PA, NJ)
16. OTHER INFORMATION
HMIS: Health 2*, Flammability 0, Physical Hazard 2
NFPA: Health 2, Fire 0, Reactivity 2, Special: OX
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: 02/05/2026
