Molybdenum Sulfate Material Safety Data Sheet (MSDS)

1. Identification

Product Name: Molybdenum Sulfate
Synonyms: Molybdic sulfate, Sulfuric acid, molybdenum(IV) salt
Chemical Formula: MoSO4
CAS Number: 13828-87-0
Manufacturer: Contact information for the producer or supplier is typically found on packaging or by reaching out via corporate websites for verification and traceability.
Recommended Use: Industrial chemical, laboratory reagent, catalyst applications.
Emergency Contact: Refer to local poison control, fire department, or the manufacturer’s emergency phone services.

2. Hazard Identification

Classification: Acute toxicity (oral), skin and eye irritant, potential respiratory hazard. Monitored under standards for inorganic metal salts.
Signal Word: Warning
Hazard Statements: Causes skin and serious eye irritation. Harmful if swallowed or inhaled. May aggravate existing lung conditions.
Precautionary Statements: Avoid inhalation of dust or fume. Do not eat, drink, or smoke near material. Wear suitable protective clothes.
Label Pictograms: Exclamation mark, corrosive symbol, health hazard.
Routes of Exposure: Inhalation, skin and eye contact, ingestion.

3. Composition / Information on Ingredients

Chemical Name: Molybdenum Sulfate
Molecular Weight: 192.01 g/mol
Ingredient: Molybdenum(IV) Sulfate
Concentration: 99% or higher
Trace Impurities: Water, oxides of molybdenum, sulfur compounds (below recognized thresholds).
Other Designations: EC Number 237-601-4, listed on most chemical substance inventories for industrial use.

4. First Aid Measures

Inhalation: Move to fresh air. Seek medical attention if cough, shortness of breath, or irritation persists.
Skin Contact: Rinse skin with water for at least 15 minutes. Remove contaminated clothing. If irritation develops, get medical attention.
Eye Contact: Rinse eyes with plenty of water for at least 15 minutes, lifting eyelids to flush thoroughly. Remove contact lenses if present.
Ingestion: Rinse mouth. Do not induce vomiting. Get medical attention immediately.
Most Important Symptoms: Irritation to respiratory tract, oral cavity, skin, eyes; symptoms may include redness, pain, coughing, or nausea.

5. Fire-Fighting Measures

Flammability: Not flammable. Will not support combustion.
Suitable Extinguishing Media: Use agents appropriate for the surrounding fire: water spray, foam, dry chemical, carbon dioxide.
Specific Hazards: Decomposition produces toxic fumes of sulfur oxides and molybdenum oxides.
Protective Equipment for Firefighters: Self-contained breathing apparatus and full protective clothing.
Special Precautions: Avoid runoff entering drains or waterways; contain contaminated water for disposal.

6. Accidental Release Measures

Personal Precautions: Wear protective gloves, goggles, dust mask, chemical-resistant clothing.
Environmental Precautions: Prevent product from entering watercourses, drains, or soil.
Cleanup Methods: Sweep up avoiding dust generation; place in suitable container for disposal. Wash area with plenty of water after material removal.
Notification Procedures: Report major spills to local authorities following established protocols or environmental regulations.

7. Handling and Storage

Handling: Use in a well-ventilated area with suitable engineering controls. Avoid direct skin or eye contact. Do not handle near open food or drink.
Safe Practices: Avoid inhalation of dust or mist. Practice good hygiene—wash hands after handling.
Storage: Store tightly closed in a dry, cool, well-ventilated area. Keep away from moisture, incompatible substances, and ignition sources.
Packaging Materials: Use containers made of compatible materials such as glass, high-density polyethylene, or corrosion-resistant metal.

8. Exposure Controls and Personal Protection

Exposure Limits: OSHA PEL (TWA): 5 mg/m³ (as Mo), ACGIH TLV: 0.5 mg/m³ (as soluble Mo compounds).
Engineering Controls: Local exhaust ventilation or enclosures to control airborne concentrations.
Personal Protective Equipment: Chemical splash goggles, nitrile or neoprene gloves, lab coat or apron, NIOSH-approved respirator if dust/fume levels are high.
Monitoring: Periodic air sampling, workplace health surveillance.
Hygiene Measures: Wash thoroughly after handling and before eating or drinking; remove contaminated clothing promptly.

9. Physical and Chemical Properties

Appearance: White to light yellow crystalline solid or powder
Odor: Odorless or faintly sulfurous
pH (aqueous solution): Acidic
Melting Point: Decomposes above 200°C
Solubility: Soluble in water, forming acidic, clear solution
Specific Gravity: ~2.98
Boiling Point: Decomposes on heating
Vapor Pressure: Not applicable, non-volatile solid
Other Properties: Hygroscopic; reacts slowly with atmospheric moisture.

10. Stability and Reactivity

Chemical Stability: Stable under normal temperature and handling conditions.
Incompatibility: Strong bases, reducing agents, moisture-sensitive chemicals.
Hazardous Reactions: Reacts with bases releasing molybdate salts and sulfur oxides.
Decomposition Products: Sulfur dioxide, sulfur trioxide, molybdenum oxides.
Conditions to Avoid: Excessive heat, humidity, open flame, incompatible substances.

11. Toxicological Information

Acute Toxicity: Oral LD50 (rat): >200 mg/kg (as molybdenum salts vary).
Irritation: Skin and eye irritant. Respiratory irritation on inhalation.
Chronic Effects: Prolonged exposure may cause anemia, liver and kidney damage, or lung symptoms.
Sensitization: No reliable reports of skin or respiratory sensitization.
Carcinogenicity: Not listed as known carcinogen by IARC, NTP, or OSHA.
Mutagenicity & Reproductive Toxicity: Not expected based on available studies.

12. Ecological Information

Ecotoxicity (aquatic): Toxic to aquatic organisms in high concentrations; long-term effects on aquatic environments not fully studied.
Persistence and Degradability: Inorganic compound, not degradable; may accumulate in sediment.
Bioaccumulative Potential: Modest risk; molybdenum compounds can be absorbed by plants and aquatic life.
Mobility in Soil: Soluble, migrates in water; potential for local contamination.
Other Adverse Effects: May disrupt environmental sulfur and molybdenum cycles in affected sites.

13. Disposal Considerations

Disposal Method: Dispose of material and contaminated containers in accordance with local, regional, and national regulations. Use hazardous waste collection services if available.
Precautions: Do not allow to enter surface water or drains. Avoid dispersal of dust in air.
Contaminated Packaging: Empty containers should be cleaned and recycled or disposed of safely.
Regulatory Codes: Typically listed under RCRA hazardous waste, but always verify based on local regulations.

14. Transport Information

UN Number: Not classified as dangerous good for most transport regulations.
Proper Shipping Name: Molybdenum Sulfate
Transport Hazard Class: N/A (may be regulated in bulk or packed form depending on country)
Packing Group: N/A
Environmental Hazards: Not a marine pollutant under standard UN definitions.
Special Transport Precautions: Keep dry, protect from moisture, ensure container integrity during shipping.

15. Regulatory Information

TSCA: Listed on US Toxic Substances Control Act inventory.
SARA Title III: Not subject to Section 313 reporting in most forms.
REACH: Registered as an existing substance in the EU; subject to annual volume tracking.
Canada CEPA: Listed as a non-specialty substance; subject to environmental release monitoring.
Labeling Requirements: Warning labels for risk of irritation and toxicity; precaution statement for professional use only.
Other Designations: Subject to reporting or workplace safety programs in several jurisdictions.