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Product Name: Sodium Tungstate Dihydrate
Chemical Formula: Na2WO4·2H2O
Synonyms: Disodium tungstate dihydrate, Tungstic acid, disodium salt, dihydrate
CAS Number: 10213-10-2
Recommended Use: Laboratory reagent, chemical synthesis, catalyst, pigment manufacture
Manufacturer: Refer to supplier documentation for manufacturer address and emergency contact
GHS Classification: Acute toxicity (oral) Category 4, Eye irritation Category 2A
Signal Word: Warning
Hazard Statements: Harmful if swallowed. Causes serious eye irritation.
Pictograms: Exclamation mark
Precautionary Statements: Wash exposed areas thoroughly after handling. Avoid breathing dust. Wear eye protection and gloves. Do not eat, drink, or smoke during use. Rinse mouth if ingested.
Routes of Exposure: Inhalation, ingestion, eye, and skin contact
Symptoms: Irritation of eyes, mucous membranes, gastrointestinal discomfort after swallowing, headache, nausea
Chemical Name: Sodium Tungstate Dihydrate
Common Name: Sodium tungstate dihydrate
Concentration: ≥99% (solid form)
CAS Number: 10213-10-2
Impurities: Typically contains only trace amounts of insoluble materials; no major hazardous impurities
Inhalation: Move exposed person to fresh air. Seek medical attention if symptoms persist. Provide artificial respiration if breathing is difficult.
Skin Contact: Remove contaminated clothing. Rinse affected area with soap and water for 15 minutes. If irritation develops or persists, consult a doctor.
Eye Contact: Flush eyes with plenty of water for at least 15 minutes, lifting eyelids occasionally. Remove contact lenses if present and easy to do. Seek medical help in case of persistent irritation.
Ingestion: Rinse mouth. Give water to drink only if conscious. Do not induce vomiting. Get medical attention if feeling unwell or in case of large ingestion.
Most Important Symptoms: Eye irritation, gastrointestinal distress, nausea, headache
Immediate Medical Attention: Not usually required unless large quantities ingested or symptoms are severe.
Suitable Extinguishing Media: Use water spray, dry chemical, foam, or carbon dioxide for surrounding fire. Product itself does not burn.
Unusual Fire Hazards: Not combustible. May release toxic fumes of sodium oxide and tungsten oxides at high temperatures.
Protective Equipment: Wear self-contained breathing apparatus and protective clothing.
Specific Hazards: Containers may rupture if heated. Thermal decomposition can generate irritant vapors.
Special Procedures: Avoid inhalation of combustion products. Evacuate personnel to safe area if necessary.
Personal Precautions: Wear proper protective gear (gloves, goggles, dust mask). Ensure adequate ventilation. Avoid dust generation and inhalation.
Environmental Precautions: Prevent further spillage if safe to do so. Do not allow release into drains or waterways.
Methods for Clean-Up: Scoop or vacuum spilled solid, place into secure container for proper disposal. Minimize dust. Wash spill area with water after cleanup. Dispose of wash water according to regulatory requirements.
Handling Practices: Avoid contact with skin and eyes. Do not breathe dust. Use only with adequate ventilation. Wash hands thoroughly after handling.
Storage Conditions: Store in tightly closed containers in a cool, dry, and well-ventilated area. Protect from moisture, incompatible substances (strong acids, reducing agents). Keep away from food and beverages.
Technical Measures: Use local exhaust or general room ventilation. Ground all equipment containing material.
Safe Transfer Methods: Use non-sparking tools. Avoid procedures that generate dust.
Exposure Limits: No specific occupational exposure limits for sodium tungstate dihydrate; ACGIH TLV for soluble tungsten compounds (as W): 1 mg/m³ TWA (inhalable fraction).
Engineering Controls: Ventilation required in areas where dust surfaces. Use closed processes when possible.
Eye Protection: Safety goggles or face shield.
Skin Protection: Chemical-resistant gloves and lab coat.
Respiratory Protection: Use NIOSH-approved particulate respirator for dusty operations.
Hygiene Measures: No eating, drinking, or smoking around product. Wash hands after use.
Appearance: White crystalline powder
Odor: Odorless
Odor Threshold: Not applicable
pH: 8–9 (5% solution in water)
Melting Point / Freezing Point: Decomposes above 100°C (loss of hydration); no distinct melting point
Boiling Point: Not applicable (decomposes before boiling)
Solubility: Soluble in water (112g/L at 20°C)
Vapor Pressure: Not applicable
Density: Approx. 3.3 g/cm³ (anhydrous form)
Partition Coefficient (n-octanol/water): Not established
Evaporation Rate: Not applicable
Other Properties: Non-flammable, non-volatile
Chemical Stability: Stable under recommended storage conditions. Loses hydration on heating.
Reactivity: Unreactive under normal handling. Reacts with strong acids to form tungstic acid; may generate toxic fumes if heated strongly.
Conditions to Avoid: High temperatures, contact with strong acids, excessive moisture.
Incompatible Materials: Strong acids, strong reducing agents, alkali metals.
Hazardous Decomposition Products: Tungsten oxides, sodium oxides.
Acute Toxicity: Oral LD50 (rat): 4000 mg/kg (as tungsten compound)
Skin Corrosion/Irritation: May cause mild irritation after prolonged contact.
Serious Eye Damage/Irritation: Causes eye irritation.
Respiratory or Skin Sensitization: No data indicating sensitization.
Chronic Effects: Prolonged exposure may cause kidney or liver damage in sensitive individuals.
Carcinogenicity: Not classified as a carcinogen by IARC, NTP, or OSHA.
Mutagenicity/Teratogenicity: No evidence from available literature.
Other Information: Tungsten compounds generally exhibit low toxicity; may bioaccumulate in aquatic organisms.
Aquatic Toxicity: Data limited; moderate toxicity to aquatic organisms based on analogous compounds.
Persistence and Degradability: Inorganic compound, not readily biodegradable.
Bioaccumulation Potential: Possible bioaccumulation in aquatic food chains; little evidence of biomagnification.
Mobility: Mobile in water, soluble, expected to leach through soil.
Other Adverse Effects: Avoid release to environment as a precaution, especially into water bodies.
Waste Treatment Methods: Collect and dispose of material at an authorized chemical waste facility, following local, state, and national regulations.
Product Disposal: Do not discharge to sewer. Incineration or landfill permissible if compliant with applicable regulations.
Contaminated Packaging: Empty containers should be rinsed and managed as chemical waste.
Precautions: Prevent product from entering watercourses during disposal operations.
UN Number: Not regulated (no special DOT, ADR, IMDG, or IATA classification)
Proper Shipping Name: Not classified as hazardous for transport
Packing Group: Not applicable
Hazard Labels: None required
Special Precautions: Protect container from physical damage. Avoid release of dust during transport.
TSCA Inventory: Listed
DSL/NDSL (Canada): Listed
REACH (EU): Registered (as relevant substance, check supplier for status)
SARA 313: Not listed
OSHA Hazards: Irritant
WHMIS Classification: D2B (Toxic material causing other toxic effects)
Other Regulations: Product can trigger workplace exposure monitoring under national chemical safety laws if handled in large quantities; hazard communication required.
