Material Safety Data Sheet
Ammonium Thiosulfate MSDS
Section 1: Chemical Product and Company Identification
Product Name: Ammonium Thiosulfate
Catalog Codes: 942
CAS#: 7783-18-8
RTECS: XN6465000
TSCA: TSCA 8(b) inventory: Ammonium Thiosulfate
CI#: Not available.
Synonym: Thio-sul; Diammonium Thiosulfate;
Ammonium Hyposulfite
Chemical Name: Thiosulfuric acid, diammonium salt
Chemical Formula: H8-N2.O3-S2
Contact Information:
Nile Chemicals
Masjid Bunder
Mumbai 400009 INDIA
US Sales : 91-022-66313162
Fax No : 91-022-23454828
Section 2: Composition and Information on Ingredients
Name CAS # % by Weight
Ammonium Thiosulfate{2} 7783-18-8 100
Toxicological Data on Ingredients: Not applicable.
Section 3: Hazards Identification
Potential Acute Health Effects: Slightly hazardous in case of skin contact (irritant), of eye contact (irritant), of ingestion, of
Potential Chronic Health Effects:
DEVELOPMENTAL TOXICITY: Not available. Repeated or prolonged exposure is not known to aggravate medical condition.
Section 4: First Aid Measures
Eye Contact:
Check for and remove any contact lenses. In case of contact, immediately flush eyes with plenty of water for at least 15
minutes. Cold water may be used. Get medical attention if irritation occurs.
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Skin Contact:
Wash with soap and water. Cover the irritated skin with an emollient. Get medical attention if irritation develops. Cold water
may be used.
Serious Skin Contact: Not available.
If inhaled, remove to fresh air. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical
Serious Inhalation: Not available.
Do NOT induce vomiting unless directed to do so by medical personnel. Never give anything by mouth to an unconscious
person. Loosen tight clothing such as a collar, tie, belt or waistband. Get medical attention if symptoms appear.
Serious Ingestion: Not available.
Section 5: Fire and Explosion Data
Flammability of the Product: Non-flammable.
Auto-Ignition Temperature: Not applicable.
Flash Points: Not applicable.
Flammable Limits: Not applicable.
Products of Combustion: Not available.
Fire Hazards in Presence of Various Substances: Not applicable.
Explosion Hazards in Presence of Various Substances:
Risks of explosion of the product in presence of mechanical impact: Not available. Risks of explosion of the product in
presence of static discharge: Not available.
Fire Fighting Media and Instructions: Not applicable.
Special Remarks on Fire Hazards:
Not readily combustible. When heated to decomposition (or in fires) it emits toxic fumes of ammonia, hydrogen sulfide, oxides
of nitrogen, sulfur.
Special Remarks on Explosion Hazards: Not available.
Section 6: Accidental Release Measures
Small Spill:
Use appropriate tools to put the spilled solid in a convenient waste disposal container. Finish cleaning by spreading water on
the contaminated surface and dispose of according to local and regional authority requirements.
Large Spill:
Use a shovel to put the material into a convenient waste disposal container. Finish cleaning by spreading water on the
contaminated surface and allow to evacuate through the sanitary system.
Section 7: Handling and Storage
Do not ingest. Do not breathe dust. If ingested, seek medical advice immediately and show the container or the label. Keep
away from incompatibles such as oxidizing agents, metals, acids, alkalis.
Storage: Keep container tightly closed. Keep container in a cool, well-ventilated area. Hygroscopic
p. 3
Section 8: Exposure Controls/Personal Protection
Engineering Controls:
Use process enclosures, local exhaust ventilation, or other engineering controls to keep airborne levels below recommended
exposure limits. If user operations generate dust, fume or mist, use ventilation to keep exposure to airborne contaminants
below the exposure limit.
Personal Protection: Safety glasses. Lab coat. Dust respirator. Be sure to use an approved/certified respirator or equivalent.
Personal Protection in Case of a Large Spill:
Splash goggles. Full suit. Dust respirator. Boots. Gloves. A self contained breathing apparatus should be used to avoid
inhalation of the product. Suggested protective clothing might not be sufficient; consult a specialist BEFORE handling this
Exposure Limits: Not available.
Section 9: Physical and Chemical Properties
Physical state and appearance: Solid. (Crystals solid. Crystalline powder.)
Odor: Ammoniacal.
Taste: Not available.
Molecular Weight: 148.21 g/mole
Color: White.
pH (1% soln/water): Not available.
Boiling Point: Not available.
Melting Point: Decomposition temperature: 150C (302F)
Critical Temperature: Not available.
Specific Gravity: Density: 1.679 (Water = 1)
Vapor Pressure: Not applicable.
Vapor Density: Not available.
Volatility: Not available.
Odor Threshold: Not available.
Water/Oil Dist. Coeff.: Not available.
Ionicity (in Water): Not available.
Dispersion Properties: See solubility in water, acetone.
Easily soluble in cold water, hot water. Slightly soluble in acetone. Insoluble in diethyl ether. Solubility in water: 103.3 g/100 ml
water @ 100 deg. C. Insoluble in alcohol
Section 10: Stability and Reactivity Data
Stability: The product is stable.
Instability Temperature: Not available.
Conditions of Instability: Incompatible materials, moisture
p. 4
Incompatibility with various substances: Reactive with oxidizing agents, metals, acids, alkalis.
Corrosivity: Not available.
Special Remarks on Reactivity:
Incompatible with aluminum and magnesium. Decomposes on heating. Hygroscopic; keep container tightly closed.
Special Remarks on Corrosivity: Copper-based alloys are seriously corroded by ammonium thiosulfate
Polymerization: Will not occur.
Section 11: Toxicological Information
Routes of Entry: Inhalation. Ingestion.
Toxicity to Animals: Acute oral toxicity (LD50): 1098 mg/kg [Guinea pig].
Chronic Effects on Humans: Not available.
Other Toxic Effects on Humans: Slightly hazardous in case of skin contact (irritant), of ingestion, of inhalation.
Special Remarks on Toxicity to Animals: Not available.
Special Remarks on Chronic Effects on Humans: Not available.
Special Remarks on other Toxic Effects on Humans:
Acute Potential Health Effects: Skin: May cause skin irritation. Eyes: Causes eye irritation. Inhalation: Causes respiratory
tract irritation. Ingestion: May cause gastrointestinal tract irritation with diarrhea. May affect behavior/central nervous system
(somnolence, convulsions, ataxia). respiration (emphysema), Kidneys (acute renal failure, acute tubular necrosis), blood
(hemorrhage). The toxicological properties of this substance have not been fully investigated.
Section 12: Ecological Information
Ecotoxicity: Not available.
BOD5 and COD: Not available.
Products of Biodegradation:
Possibly hazardous short term degradation products are not likely. However, long term degradation products may arise.
Toxicity of the Products of Biodegradation: The product itself and its products of degradation are not toxic.
Special Remarks on the Products of Biodegradation: Not available.
Section 13: Disposal Considerations
Waste Disposal:
Waste must be disposed of in accordance with federal, state and local environmental control regulations.
Section 14: Transport Information
DOT Classification: Not a DOT controlled material (United States).
Identification: Not applicable.
Special Provisions for Transport: Not applicable.
Section 15: Other Regulatory Information
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Federal and State Regulations:
Illinois toxic substances disclosure to employee act: Ammonium Thiosulfate Pennsylvania RTK: Ammonium Thiosulfate
Massachusetts RTK: Ammonium Thiosulfate Massachusetts spill list: Ammonium Thiosulfate New Jersey: Ammonium
Thiosulfate TSCA 8(b) inventory: Ammonium Thiosulfate
Other Regulations: EINECS: This product is on the European Inventory of Existing Commercial Chemical Substances.
Other Classifications:
WHMIS (Canada): Not controlled under WHMIS (Canada).
This product is not classified according to the EU regulations. S24/25- Avoid contact with skin and eyes. S36/37/39- Wear
suitable protective clothing, gloves and eye/face protection.
HMIS (U.S.A.):
Health Hazard: 1
Fire Hazard: 0
Reactivity: 0
Personal Protection: E
National Fire Protection Association (U.S.A.):
Health: 1
Flammability: 0
Reactivity: 0
Specific hazard:
Protective Equipment:
Gloves. Lab coat. Dust respirator. Be sure to use an approved/certified respirator or equivalent. Safety glasses.
Section 16: Other Information
The information above is believed to be accurate and represents the best information currently available to us. However, we
make no warranty of merchantability or any other warranty, express or implied, with respect to such information, and we assume
no liability resulting from its use. Users should make their own investigations to determine the suitability of the information for
their particular purposes. In no event shall Nile be liable for any claims, losses, or damages of any third party or for
lost profits or any special, indirect, incidental, consequential or exemplary damages, howsoever arising,
has been advised of the possibility of such damages.

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