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Chemical Name: Black Iron Oxide Common Name: Magnetite Chemical Formula: Fe3O4 Physical State: Fine, black powder Odor: None Common Uses: Pigment in paints, construction materials, ceramics, abrasive polishing compounds, toner for copiers and printers Synonyms: Ferrosoferric oxide, iron(II,III) oxide CAS Number: 1317-61-9
Hazard Classification: Generally classified as non-hazardous for industrial and consumer use, but dust can irritate eyes, skin, and respiratory tract Potential Health Effects: Prolonged inhalation of fine particulates may contribute to respiratory discomfort, coughing, or sneezing Chronic Exposure Risks: Excessive exposure in workplace settings may lead to mild pulmonary siderosis (benign iron accumulation in lungs, not associated with fibrosis or disability) Environmental Impact: Inert and not recognized as hazardous to aquatic or terrestrial environments Label Elements: Dust hazard symbol may appear in industrial settings to highlight particulate inhalation risk
Component: Iron(II,III) oxide (Fe3O4) Concentration: Typically greater than 95% iron oxides Minor Impurities: May include traces of SiO2, Al2O3, or other naturally co-occurring oxides, levels depending on ore quality and processing
Inhalation: Move to fresh air, offer water to clear throat and nasal passages Eye Contact: Flush gently with clean water for several minutes, seek medical attention for persistent irritation Skin Contact: Wash with soap and water, remove contaminated clothing and clean before reuse Ingestion: Rinse mouth, drink water, seek medical advice if large quantity is swallowed Notes to Physician: Product itself is not reactive; focus on symptomatic treatment
Suitable Extinguishing Media: Use water spray, foam, dry chemical, or CO2 for surrounding materials Special Hazards: Black iron oxide is non-flammable, but containers in a fire may rupture from heat Protective Equipment: Standard firefighting gear, self-contained breathing apparatus for heavy dust Decomposition Products: Will not generate hazardous gases or vapors at ambient or fire temperatures
Personal Precautions: Avoid dust formation, ventilate area, prevent breathing of dust Environmental Precautions: Prevent further spillage, sweep up to limit spread, avoid generating airborne particles Cleanup Methods: Collect with a broom or vacuum with HEPA filter, dispose of according to local regulations Personal Protection: Wear dust mask, gloves, goggles if handling large amounts
Safe Handling Practices: Minimize dust creation, use with adequate ventilation or dust extraction Safe Storage Conditions: Store in tightly closed containers, keep dry, avoid incompatible substances like strong acids Materials to Avoid: Storage near strong oxidizers, acids can result in reaction and gas evolution General Hygiene: Wash hands after handling, remove contaminated clothing before eating or drinking
Occupational Exposure Limits: OSHA PEL for nuisance dust (respirable): 5 mg/m3, total dust: 15 mg/m3; ACGIH TLV for iron oxide dust: 5 mg/m3 (respirable fraction) Engineering Controls: Use local exhaust ventilation or general dilution ventilation Personal Protective Equipment: Dust mask or respirator in poorly ventilated or high-exposure areas; goggles to shield eyes; gloves to limit skin contact Workplace Monitoring: Periodic air sampling in occupational settings can confirm dust levels remain below regulatory thresholds
Appearance: Fine, black crystalline powder Odor: Odorless Boiling Point: Not applicable Melting Point: Approximately 1,590°C Solubility: Insoluble in water Specific Gravity: Approx. 5.2 pH Value: Neutral suspension in water Vapor Pressure: Negligible Flammability: Not flammable
Chemical Stability: Stable under normal temperatures and pressures Conditions to Avoid: Mixing with strong acids, prolonged exposure to high humidity can encourage caking Incompatibilities: Avoid contact with strong oxidizing agents, acidic conditions may generate soluble iron salts and hydrogen Hazardous Decomposition Products: None known for standard use or storage
Acute Toxicity: Not considered acutely toxic via inhalation, ingestion, or skin contact Irritation Potential: Prolonged or repeated exposure to dust may cause mild irritation to eyes, skin, and respiratory system Chronic Health Effects: Inhaled dust can cause benign pneumoconiosis known as siderosis Carcinogenicity: Not listed as carcinogen by IARC, NTP, or OSHA Bioaccumulation: Not expected to bioaccumulate
Aquatic Toxicity: Insoluble iron oxide has low mobility and toxicity in water Persistence/Degradability: Stable, not degraded by environmental processes Bioaccumulative Potential: Minimal, not readily absorbed by organisms Soil Mobility: Tends to remain near site of application or release Other Effects: No evidence of hazardous impact on microorganisms, invertebrates, fish, or plants under normal usage conditions
Recommended Disposal: Collect and recycle clean product if possible; landfill as a non-hazardous solid waste following local, regional, and national regulations Avoided Practices: Do not dispose into sewers or waterways Container Disposal: Empty bags or drums can be recycled or disposed of with general solid waste, ensure containers fully emptied before disposal
UN Number: Not regulated for ground, air, or marine shipment in most regions Proper Shipping Name: Iron oxide pigment Packing Group: Not applicable Hazard Class: Non-hazardous Special Transport Precautions: Handle to minimize dust release during loading and unloading
OSHA: Classified as nuisance dust TSCA: Listed DSL/NDSL: Listed EPA Status: Not a hazardous waste Country-Specific: Black iron oxide appears on chemical inventories in Europe and Asia without significant restriction for standard industrial uses
