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Name: Chromium Trioxide, anhydrous
Chemical Formula: CrO3
Common Uses: Electroplating, wood preservation, pigment production
Appearance: Dark red to purple crystals, sometimes mistaken for other transition metals at a glance
Odor: Odorless
Molecular Weight: 99.99 g/mol
Synonyms: Chromic Acid, Chromium(VI) oxide
Main Danger: Chromium trioxide carries a serious punch - it is highly toxic through inhalation, ingestion, or skin contact
Health Hazards: Severe burns, possible cancer risk, skin sensitization, chronic allergies
Physical Hazards: Strong oxidizer; reacts with organic materials and can spark fires
Acute Symptoms: Breathing difficulties, coughing, chest pain, skin rash
Chronic Effects: Lung cancer, kidney and liver damage, nasal septum perforation
GHS Labels: Corrosive, Carcinogenic, Oxidizing agent, Environmental hazard symbols
Chemical Identity: Chromium Trioxide (CrO3)
Concentration: Usually near 99% in industrial-grade anhydrous form
Impurities: Sometimes trace metallic impurities, but these seldom change the hazard profile
Inhalation: Move to fresh air fast, oxygen support may be essential, seek emergency care
Skin Contact: Remove contaminated clothes, rinse thoroughly with running water, don't delay treatment
Eye Contact: Immediate flushing with water for at least 15 minutes, get medical help
Ingestion: Rinse mouth, never induce vomiting, seek urgent hospital attention
Long-Term Care: Closely monitor for respiratory distress, kidney or liver function impairment
Flammability: Not flammable itself, but increases fire risks when mixed with combustibles
Suitable Extinguishing Media: Use water spray, avoid dry chemical or foam
Special Hazards: Decomposition releases hazardous chromium fumes and oxygen
Protective Equipment: Full protective suit, self-contained breathing apparatus essential for responders
Advice: Remove containers from fire zone if safe, cool with abundant water, avoid inhaling vapors
Personal Precautions: Evacuate unnecessary personnel, ventilate the area thoroughly
Protective Gear: Gloves, goggles, chemical-resistant apron, respiratory protection
Containment: Prevent entry into drains or waterways, absorb with inert material like vermiculite
Cleanup: Scoop up solid product, wash down residues with plenty of water; all waste needs proper hazardous waste handling
Safe Handling: Always work in well-ventilated areas, use tools rather than hands, avoid creating dust
Storage Conditions: Store in tightly closed containers, away from incompatible substances, in cool and dry locations
Incompatibilities: Strong bases, organic materials, reducing agents which can trigger violent reactions
Avoidance: No eating, drinking, or smoking nearby, wash hands often, label storage areas clearly
Occupational Limits: OSHA sets chromium (VI) limits at 0.005 mg/m3 over an 8-hour shift
Engineering Controls: Local exhaust ventilation, process enclosures
PPE: Nitrile gloves, splash-proof goggles, chemical-resistant clothing, and NIOSH approved respirators
Workplace Practices: Routine monitoring of air and surfaces, strict hygiene policies
Physical State: Solid, granular or crystalline
Color: Deep red or purple depending on light and form
Melting Point: Around 197°C (decomposes before melting fully)
Solubility: Dissolves readily in water, generating heat
Odor Threshold: No detectable odor
Density: About 2.7 g/cm3
Chemical Stability: Stable under recommended storage settings, quickly reacts with moisture
Reactivity: Very reactive with organics, reducing agents, and some metals
Dangerous Reactions: Can cause explosions or fires with combustibles, produces toxic gases on contact with acids and water
Breakdown Products: Generates chromium oxides and oxygen under heat or fire
Toxicity Route: Inhalation, skin absorption, ingestion, eye contact
Short-Term Effects: Burns, severe irritation to respiratory and digestive tracts, eye damage
Long-Term Effects: Known human carcinogen, especially in the lungs; kidney and liver toxicity well-documented
Regulatory Notes: Listed by IARC, NTP, and OSHA as a confirmed cancer-causing substance
Environmental Fate: Highly water-soluble, can contaminate waterways easily
Persistence: Remains in soil and sediment, converts to other toxic chromium compounds
Ecotoxicity: Fatal to fish and aquatic life at trace levels, accumulates in the food chain
Bioaccumulation: Documented in aquatic and terrestrial organisms, extra risk for ecosystems near industry
Waste Treatment: Needs hazardous waste landfill or permitted incineration
Container Disposal: Rinse containers triple times, collect rinsate as hazardous waste
Impact: Never dispose in regular trash or down the drain, penalties can be steep for improper disposal
Professional Handling: Train workers thoroughly in hazardous waste protocols
UN Classification: Classified as hazardous material for transport by road, air, and sea
Packing Requirements: Must use UN-approved, corrosion resistant packaging materials
Labeling: Clear oxidizer and toxic pictograms mandatory
Special Precautions: Don't ship with organic or flammable products, secure against movement or spills
Regulatory Listings: Cited under IMDG, IATA, and US DOT dangerous goods codes
Worker Protection: OSHA chromium (VI) exposure standards enforced in US workplaces
Public Safety: EPA lists chromium trioxide as a hazardous air pollutant, special limits apply
Industry Controls: Requires risk management plans, special monitoring, and periodic reporting to government
Restriction Details: Use faces bans or heavy regulation in many countries, alternative products encouraged for some applications
