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Chemical Name: Molybdenum(VI) oxide
Common Names: Molybdenum trioxide, MoO3
Physical Appearance: White to light-yellow crystalline solid
Typical Uses: Found in metallurgy, ceramics, chemical synthesis, and as a catalyst
Health Hazards: Causes respiratory and eye irritation, may trigger coughing and shortness of breath, possible skin sensitivity develops with repeated contact
Fire and Explosion Risks: Stable under most conditions but dust accumulation ignites with strong oxidizers
Environmental Hazards: Not highly mobile, but long-term exposure in soil or water creates risks for aquatic life
Primary Ingredient: Molybdenum(VI) oxide
Concentration: Ranges from 98-100% purity in industrial settings
Common Contaminants: Small traces of iron, sulfur, silicates
Inhalation: Move to fresh air, loosen clothing, seek medical help if cough or breathing trouble continues
Skin Contact: Wash with soap and water; persistent rash or irritation calls for medical attention
Eye Contact: Rinse with water for several minutes; remove contact lenses if present
Ingestion: Rinse mouth, avoid inducing vomiting unless told by a doctor
Suitable Extinguishing Media: Use dry chemical, CO2, or foam
Unsuitable Media: Avoid water streams that spread dust
Protective Equipment: Wear protective gear and a self-contained breathing apparatus
Hazardous Combustion Products: Emits toxic sulfur oxides and molybdenum fumes in fire
Personal Protection: Dust mask, goggles, and gloves protect from skin and inhalation risks
Spill Cleanup: Sweep up using dust-minimizing techniques, shovel into secure containers
Ventilation: Keep area well-ventilated until clean
Avoidance: Prevent product entering drains or waterways
Safe Handling: Limit dust, use in well-ventilated areas, avoid contact with open wounds
Storage Needs: Store in cool, dry, and well-sealed containers, away from incompatible substances like strong acids or oxidizers
Hygienic Advice: Wash thoroughly after handling, avoid eating or smoking on site
Occupational Exposure Limits: Molybdenum exposure regulated by agencies like OSHA and ACGIH, with limits around 5 mg/m³ for respirable forms
Engineering Controls: Use local exhaust ventilation, fit workspaces with dust collection systems
Personal Protection: Gloves, protective suits, safety goggles, and approved respirators if dust levels rise
Appearance: White or pale yellow powder or crystals
Melting Point: Around 795°C
Solubility: Low in cold water, moderate in ammonia, soluble in alkali
Odor: Odorless
Molecular Weight: About 143.95 g/mol
Density: Roughly 4.7 g/cm³
Chemical Stability: Remains stable in dry, normal atmospheric conditions
Incompatible Substances: Strong oxidizers, reducing agents, hydrofluoric acid
Hazardous Decomposition: High-heat scenarios, like fires, generate molybdenum fumes and various oxides
Acute Toxicity: Inhalation and skin contact may cause headaches, nasal irritation, and dermatitis
Chronic Exposure Impacts: Prolonged exposure possibly damages lungs or kidneys, some reports of anemia in animal studies
Health Monitoring: Regular health checks keep risks down, especially for workers in constant contact
Environmental Fate: Tends to persist in soil, low water solubility reduces quick spread
Risk to Aquatic Life: High doses harm fish and other aquatic organisms
Bioaccumulation: Tends not to accumulate in higher animals, but chronic exposure in plants and lower organisms remains a concern
Waste Treatment: Collect and contain in sealed, labeled receptacles
Disposal Pathways: Send for recovery or hazardous waste landfill; avoid incineration
Regulations: Compliance with national and local hazardous waste statutes enforces safety
Hazard Classification: Not classed as dangerous for transport by most regulatory standards
Packaging Requirements: Non-reactive sealed containers work best, labels flag hazard warnings
Shipping Advice: Keep separate from food and feed items, secure to prevent airborne dust
Workplace Guidelines: Exposure limits in line with OSHA or ACGIH rules apply in most industrialized countries
Label Mandates: Safety and hazard labels required under standards like GHS
Disclosure: Safety training and information access for at-risk staff foster prevention
Global Oversight: Most countries keep Molybdenum oxide controlled under chemical safety regulations, including REACH in Europe and TSCA in the United States
