Material Safety Data Sheet: Potassium Stannate

Identification

Product Name: Potassium Stannate
Chemical Formula: K₂SnO₃
CAS Number: 12027-70-2
Synonyms: Dipotassium trioxostannate, Stannate(IV) potassium
Recommended Use: Electroplating, chemical manufacturing, laboratory reagent, textile processing, surface treatment
Supplier Details: Chemical manufacturers usually provide specific contact information, including emergency telephone numbers, factory address, and relevant safety officer email.

Hazard Identification

GHS Classification: Skin irritant (Category 2), Eye irritant (Category 2A), Specific target organ toxicity (single exposure, Category 3)
Signal Word: Warning
Hazard Statements: Causes skin and eye irritation (H315, H319). May cause respiratory irritation (H335).
Precautionary Statements: Avoid breathing dust or mist. Wash skin thoroughly after handling. Wear protective gloves and eye protection. Use in well-ventilated areas.
Potential Health Effects: Dust can severely irritate eyes, skin, respiratory tract. Prolonged contact may result in dermatitis, coughing, or other allergic reactions.

Composition / Information on Ingredients

Substance: Potassium Stannate
CAS Number: 12027-70-2
Concentration: Typically above 98% pure in technical or laboratory quantities
Impurities: Trace metals, potassium compounds, moisture (<2%) depending on storage and manufacturing conditions

First Aid Measures

Inhalation: Move affected person to fresh air. Provide oxygen or artificial respiration if breathing is difficult. Seek medical attention if symptoms persist.
Skin Contact: Remove contaminated clothing. Wash thoroughly with soap and water. Seek medical help if irritation continues.
Eye Contact: Rinse cautiously with water for several minutes, lifting eyelids occasionally. Remove contact lenses if present. Continue rinsing and get prompt medical advice.
Ingestion: Rinse mouth with water. Drink water to dilute. Do not induce vomiting. Seek professional medical assistance immediately.

Fire-Fighting Measures

Suitable Extinguishing Media: Use water spray, foam, dry chemical, or carbon dioxide. Cooling exposed containers with water can help prevent pressure buildup.
Special Protective Equipment: Firefighters should wear self-contained breathing apparatus and full protective gear.
Specific Hazards: Product decomposes at high temperatures, releasing toxic fumes such as potassium oxides and tin oxides. Dust particles in the air can create explosive mixtures.
Advice for Firefighters: Move containers from fire area if it can be done safely. Prevent runoff from sulfur-rich firefighting water into sewers.

Accidental Release Measures

Personal Precautions: Evacuate unprotected personnel from spill area. Use PPE—gloves, safety goggles, dust masks/respirators. Avoid generating dust.
Environmental Precautions: Prevent entry into drains, soil, waterways. Isolate spilled powder to avoid contamination.
Methods for Clean-up: Sweep up without creating dust, then shovel into sealed, labeled containers for proper disposal. Use water spray to minimize airborne dust. Wash spill area with water afterwards.

Handling and Storage

Handling: Work in a well-ventilated space or fume hood. Avoid inhaling dust. Handle containers carefully to prevent breakage and spillage. Do not eat, drink, or smoke during use.
Storage: Store in cool, dry, well-ventilated area. Keep away from acids, moisture, and incompatible chemicals. Use shatter-proof, airtight containers. Securely label storage containers and restrict unauthorized access.

Exposure Controls and Personal Protection

Exposure Limits: No specific OSHA, ACGIH, or NIOSH exposure limits assigned. General dust exposure limits may apply (e.g., OSHA PEL for Particulates Not Otherwise Regulated: 15 mg/m³ total dust, 5 mg/m³ respirable fraction).
Engineering Controls: Provide local exhaust ventilation. Enclose handling processes. Use dust collection systems or HEPA filters.
Personal Protective Equipment: Wear chemical-resistant gloves (nitrile or butyl), face shield or safety goggles, protective clothing, dust mask or approved respirator if dust is likely.
Hygiene Measures: Wash hands, arms, and face after handling. Remove contaminated clothing and wash before reuse.

Physical and Chemical Properties

Appearance: White to off-white crystalline powder
Odor: Odorless
pH: Alkaline, usually 12-13 (1% solution in water)
Melting Point: Decomposes above 500°C
Boiling Point: Not applicable (decomposes before boiling)
Solubility: Soluble in water, insoluble in organic solvents
Vapor Pressure: Not available
Density: Approximately 3.93 g/cm³
Flash Point: Not flammable
Other Data: Strongly hygroscopic. Forms caustic solution in water. Reacts with acids to produce toxic stannic compounds.

Stability and Reactivity

Stability: Stable under normal storage and handling conditions. Tends to absorb moisture from air.
Reactivity: Reacts strongly with acids, releasing stannic oxide and potassium salts.
Incompatible Materials: Acids, strong oxidizing agents, ammonium salts, and moisture.
Hazardous Decomposition Products: Releases potassium oxides, tin oxides, stannite fumes on heating or contact with acids.
Conditions to Avoid: Exposure to moisture, excessive heat, and incompatible substances.

Toxicological Information

Routes of Exposure: Inhalation, skin and eye contact, ingestion.
Acute Effects: Irritates respiratory tract, eyes, and skin with potential redness, burning or rash.
Chronic Effects: Potential for sensitization, skin dermatitis, long-term respiratory issues, kidney or liver strain after repeated exposures.
LD50 Values: Not precisely established for potassium stannate, but related tin compounds show oral LD50 (rat) >2000 mg/kg.
Carcinogenicity: No classification as carcinogenic from IARC, NTP, or OSHA.
Other Toxicological Data: No significant mutagenicity, teratogenicity, or reproductive toxicity reported in available studies.

Ecological Information

Ecotoxicity: Harmful to aquatic life, especially when released in large quantities. Tin and potassium compounds in water disrupt aquatic organisms.
Persistence and Degradability: Not readily biodegradable. Remains in environment as insoluble compounds.
Bioaccumulation Potential: Tin can accumulate in sediment and in some aquatic organisms over time, though potassium disperses quickly.
Mobility in Soil: Dissolves in water, can migrate into groundwater if not contained.
Other Adverse Effects: High concentrations may alter water chemistry and soil nutrient balance.

Disposal Considerations

Waste Disposal Methods: Collect and place material in tightly sealed containers. Dispose of at approved hazardous waste facility, following local, regional, and national laws.
Empty Containers: Triple-rinse with water before discard. Containers may retain residue—do not reuse for other chemicals.
Contaminated Packaging: Handle as hazardous waste, arrange for specialized disposal.
Other Recommendations: Do not release into drains, soil, or natural waterways.

Transport Information

UN Number: Not classified as a hazardous material for ground, sea, or air transport, unless mixed with other dangerous goods.
Proper Shipping Name: Potassium Stannate
Transport Hazard Class: Not regulated as dangerous goods according to international, national shipping directives.
Packing Group: Not classified
Special Precautions: Store securely during transit to prevent container breakage or accidental release. Keep away from foodstuffs and incompatible substances.

Regulatory Information

Label Requirements: GHS hazard pictograms, relevant hazard statements and precautionary phrases
TSCA Status: Listed
EU Regulation: REACH registered, not included in candidate list of Substances of Very High Concern (SVHC)
SARA Title III: Not regulated for emergency planning or reporting under sections 302, 311, 312, 313
Canada WHMIS: Classified as hazardous, with requirements for hazard communication, safe handling
Other Regulations: Local occupational, environmental, and public health rules may apply for large-scale handling or disposal.