Material Safety Data Sheet for Stannous Methanesulfonate

Identification

Product Name: Stannous Methanesulfonate
Chemical Formula: Sn(CH₃SO₃)₂
CAS Number: 53408-94-9
Synonyms: Tin(II) Methanesulfonate, Stannous MSA
Intended Use: Electroplating, surface treatment, electronics manufacturing
Supplier: Notified by manufacturer or distributor
Contact Information: Refer to label or supplier documentation for emergency numbers and address

Hazard Identification

GHS Classification: Skin irritation (Category 2); Eye irritation (Category 2A); Acute aquatic hazard (Category 3)
Pictograms: Exclamation mark, Environment
Signal Word: Warning
Hazard Statements: Causes skin irritation. Causes serious eye irritation. Harmful to aquatic life.
Precautionary Statements: Avoid contact with skin and eyes. Avoid release to the environment. Wear suitable protective clothing, gloves, and eye protection.
Potential Health Effects: Contact with skin or eyes leads to redness, pain, possible burns. Inhalation may cause irritation of respiratory tract. Ingestion could result in nausea, vomiting, or abdominal pain.

Composition / Information on Ingredients

Chemical Name: Stannous Methanesulfonate
Common Name: Tin(II) Methanesulfonate
CAS Number: 53408-94-9
Concentration: Typically above 95%
Impurities or Stabilizing Additives: Water, trace metals (variable by supplier), residual methanesulfonic acid

First Aid Measures

Inhalation: Move affected individual to fresh air. Provide artificial respiration if breathing stops. Seek medical attention for persistent symptoms.
Skin Contact: Remove contaminated clothing. Flush skin thoroughly with running water for at least 15 minutes. Seek medical advice for irritation or burns.
Eye Contact: Rinse with slow, gentle stream of lukewarm water for several minutes. Remove contact lenses if present. Immediate medical attention recommended.
Ingestion: Rinse mouth with water. Do not induce vomiting. Do not give anything by mouth to an unconscious person. Seek prompt medical care.
Most Important Symptoms: Redness, irritation, discomfort, possible visual impairment with eye contact, possible allergies.
Special Notes for Physicians: Treat symptomatically. Monitor for respiratory distress and chemical-induced burns.

Fire-Fighting Measures

Suitable Extinguishing Methods: Use CO₂, dry chemical, or alcohol-resistant foam. Water spray to cool surfaces.
Specific Hazards: Can produce toxic fumes under fire conditions, including tin oxides and sulfur oxides.
Protective Equipment: Firefighters wear self-contained breathing apparatus and full protective gear.
Advice for Firefighters: Evacuate area. Stay upwind. Avoid dust inhalation or contact with decomposition products.
Unusual Fire Hazards: Containers exposed to heat may rupture due to pressure buildup.

Accidental Release Measures

Personal Precautions: Ensure adequate ventilation. Avoid skin and eye contact. Evacuate unnecessary personnel.
Protective Gear: Use chemical-resistant gloves, goggles, and suitable protective clothing.
Environmental Precautions: Prevent run-off into sewers, waterways, or soil. Notify authorities if significant release occurs.
Spill Clean-Up: Absorb spill with inert material (sand, earth, or proprietary absorbent). Collect in containers for disposal. Flush area with water once cleaned.
Methods for Containment: Dike spill for recovery or disposal. Wash spill area after pick-up.

Handling and Storage

Handling Notes: Keep container tightly closed. Use only with adequate ventilation. Wear appropriate personal protective equipment. Do not eat, drink, or smoke in work areas. Avoid formation of aerosols.
Storage Notes: Store in original, labeled containers. Keep in cool, dry, well-ventilated environment. Store away from strong oxidizers, acids, alkalis, and incompatible materials. Protect from moisture.
Specific Practices: Use secondary containment. Regularly inspect storage areas for leaks or corrosion.

Exposure Controls and Personal Protection

Occupational Exposure Limits: No OSHA or ACGIH limits for stannous methanesulfonate specifically; observe tin compounds dust/mist standards (2 mg/m³ as tin, TWA).
Engineering Controls: Maintain local exhaust ventilation. Use fume hoods for large quantities.
Respiratory Protection: NIOSH/MSHA-approved respirator as required for airborne exposure.
Skin Protection: Wear impervious gloves (nitrile or neoprene). Lab coats or overalls recommended.
Eye Protection: Use chemical safety goggles or face shield.
Hygiene Measures: Wash hands and face after handling. Remove contaminated clothing and wash before reuse.
Environmental Controls: Avoid release to the environment. Use enclosed systems or wet methods to reduce dust/aerosol emissions.

Physical and Chemical Properties

Appearance: Colorless to pale yellow liquid (commercial solutions); white powder (pure solid)
Odor: Faint, similar to sulfur or acid
Odor Threshold: Not available
pH: Slightly acidic in solution
Melting Point/Freezing Point: Decomposes before melting
Boiling Point: Not established (decomposes)
Flash Point: Not flammable
Evaporation Rate: Not established
Flammability: Not flammable under normal conditions
Vapor Pressure: Negligible
Vapor Density: Not applicable
Solubility: Completely soluble in water
Partition Coefficient (n-octanol/water): Not measured
Auto-ignition Temperature: Not applicable
Decomposition Temperature: Above 120°C (release of toxic fumes)
Viscosity: Resembles water in diluted liquid form
Other Information: Tends to hydrolyze in moist air

Stability and Reactivity

Chemical Stability: Stable under recommended storage and handling conditions.
Possibility of Hazardous Reactions: Forms toxic gases (tin oxides, SO_x) on decomposition. Reacts with bases to produce heat.
Conditions to Avoid: Heating above decomposition temperature, contact with incompatible chemicals, exposure to moisture.
Incompatible Materials: Strong oxidizers, strong bases, reducing agents, acids (except methanesulfonic acid)
Hazardous Decomposition Products: Tin oxides, methane sulfonic acid, sulfur dioxide, possibly hydrogen sulfide
Polymerization: Not known to occur

Toxicological Information

Acute Toxicity: Limited data available; ingestion of tin compounds results in low acute toxicity, but gastrointestinal irritation common.
Skin Corrosion/Irritation: Causes significant skin irritation. Long contact may lead to burns.
Serious Eye Damage/Irritation: Severe irritation, risk of eye injury.
Respiratory or Skin Sensitization: No confirmation in literature, but irritant for sensitive individuals.
Chronic Effects: Prolonged exposure may affect liver, kidneys, or central nervous system, based on studies with related tin compounds.
Carcinogenicity: No evidence for carcinogenicity from this substance.
Reproductive Toxicity: Not established for stannous methanesulfonate specifically.
Mutagenicity: Not established.
Route-specific Effects: Absorption through intact skin unlikely, but can occur with broken skin. Eye and inhalation exposure present largest risk in plating lines.

Ecological Information

Ecotoxicity: Harmful to aquatic organisms in high concentrations; exact LC50 or EC50 not available for this compound but expected based on related tin compounds.
Persistence and Degradability: Not rapidly biodegradable. Tin persists in environment as inorganic salts.
Bioaccumulation Potential: Tin shows some bioaccumulative tendencies; little data for methanesulfonate salt specifically.
Mobility in Soil: High solubility in water favors migration through soil and groundwater.
Other Adverse Effects: Excessive contamination in aquatic environments may impact fish and invertebrates.
Prevention: Limit release into drains, ditches, or natural waterways.

Disposal Considerations

Waste Treatment Methods: Collect for disposal according to local, regional, or national regulations.
Waste from Residues: Larger volumes may qualify as hazardous waste; neutralize and dilute only as permitted.
Contaminated Packaging: Rinse containers thoroughly before disposal or recycling; follow specific jurisdictional rules.
Special Precautions: Never discharge to surface water or municipal sewers.
Recycling: Some tin may be recoverable by specialized processors; check local facilities.
EPA Hazardous Waste Number: Not specifically listed, but treat based on content of regulated metals.

Transport Information

UN Number: Not listed as dangerous for transport (check with national regulations)
Transport Hazard Class: Not regulated for ground, air, or sea under most jurisdictions, provided dilute solutions.
Packing Group: N/A
Proper Shipping Name: Stannous Methanesulfonate solution (if classified, adjust based on concentration and volume)
Environmental Hazards: Not considered marine pollutant in diluted form (consult local shipping requirements)
Special Precautions: Avoid packaging that may corrode; provide labels with spill and emergency response instructions.

Regulatory Information

Labeling Requirements: GHS label with hazard pictograms, signal word, hazard and precautionary statements.
TSCA: Listed or complies with provisions.
SARA Title III: Contains tin; reportable quantity as per regulation for certain volumes.
REACH: Registered or pre-registered in EU by authorized manufacturers.
California Proposition 65: Not currently listed.
Other International Standards: Consult local chemical inventories for restrictions or requirements.
Worker Protection: Refer to OSHA, NIOSH, or EU guidance on occupational exposure.