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Substance name: 1,8-Naphthalic anhydride
Chemical formula: C12H6O3
Appearance: White to pale yellow crystalline powder
Distinct odor: Odorless or very mild aroma that barely registers in most labs
Usage fields: Dye precursors, organic syntheses, pigment manufacturing
CAS number: 81-11-8
Main hazards: Irritating to eyes, skin, and mucous membranes; inhalation of dust can trigger coughing, sore throat, or nose irritation
Chronic risk: Skin contact over time can produce redness, dryness, and even mild dermatitis
Warning symbols: Exclamation mark for irritant; not listed as a major carcinogen by IARC or OSHA
Combustion: Can release toxic gases such as carbon oxides when burned
Chemical composition: Pure form contains only 1,8-Naphthalic anhydride
Impurities: Trace organic byproducts from manufacture; these are rarely found in lab-grade batches
Eye contact: Rinse carefully and continuously for several minutes with running water; medical attention if irritation persists
Skin contact: Wash thoroughly with plenty of soap and water; remove contaminated clothing
Inhalation: Move to fresh air; support breathing if symptoms occur; persistent issues signal need for medical help
Ingestion: Rinse mouth, avoid inducing vomiting, seek medical assessment to determine further steps
Suitable extinguishing methods: Use dry chemical, CO2, or foam extinguishers; avoid water jet on powder fires
Hazardous combustion products: Smoke may carry carbon monoxide and carbon dioxide; irritant fumes can sicken responders
Protection for fire personnel: Standard self-contained breathing apparatus and protective clothing
Fire spread: Powdered material can encourage fine dust explosions if not contained
Spill handling: Sweep up with minimal dust creation; shovel into dry, well-marked containers
Ventilation: Ensure thorough air flow to keep dust exposure low; close doors to stop migration into common areas
Personal precautions: Avoid bare-skin contact; wash down surfaces once spill is contained
Disposal of residue: Bag dust and dirty cleaning material for special solid waste disposal; never flush it
Handling: Always wear gloves and goggles; use respiratory protection if powder gets airborne
Storage conditions: Keep away from heat and ignition sources; store in tightly sealed, labeled vessels
Cross-contamination risk: Store away from strong acids, alkalis, or reducing agents to avoid chemical surprises
Workplace hygiene: Wash hands thoroughly after each session, and never eat or drink where this material is handled
Engineering controls: Local exhaust fans and ventilated benches keep dust out of breathing zones
Personal protective equipment: Respirators for fine dust, goggles for all handling, chemical-resistant gloves, long-sleeved lab gear
Exposure limits: No OSHA or ACGIH standard values, so risk assessment prevails; keeping air particulate below noticeable levels remains smart practice
Form: Fine crystalline solid
Melting point: Around 273°C
Boiling point: Decomposes before boiling under standard atmosphere
Solubility: Low in water, but dissolves in organic solvents such as acetone or chloroform
Vapor pressure: Negligible at room temperature, so inhalation risks mostly stem from powder
Other properties: Stable under regular indoor temperatures and pressure; not noticeably volatile
Reactivity profile: Stays stable in isolation, but reacts with strong bases, acids, or reducing chemicals
Decomposition: Extended heat may break it down into hazardous gases
Polymerization: No risk of dangerous polymerization under regular work conditions
Avoid with: Free-flowing oxidizers or aggressive reagents might spark reactions
Routes of entry: Inhalation, dermal, ingestion
Acute symptoms: Eye irritation, nasal discomfort, coughing, possible skin rash
Long-term exposure: Unlikely to cause serious systemic toxicity; repeated exposure causes localized symptoms rather than organ damage
Not classified: No clear links to mutagenicity, carcinogenicity, or reproductive toxicity reported in scientific literature
Environmental effect: Solid in bulk form sinks in water, resists breakdown
Persistence: Degrades slowly in the environment due to stable aromatic rings
Bioaccumulation: Potential for slow buildup in soil and sediment, though not considered acutely hazardous to aquatic life
Disposal impact: Improper dumping may harm local ecosystems by contaminating sediment layers
Waste method: Dispose of through properly permitted hazardous waste channels
Don’t flush: Never put down drains or mix with regular solid waste streams
Cleanup gear: Bag all clean-up debris tightly; label for chemical waste seizure
Compliance: Always lean on the side of designated chemical disposal regulations to keep landfills free of possible contamination
UN classification: Not typically classified as dangerous goods for general ground transport, but bulk shipments may face labeling requirements
Packing: Use sealed, resistant containers with clear hazard labeling; avoid stacking to prevent spills
Spill during transit: Rapid notification and cleanup keep risks in check; transporters should gear up with spill kits
Chemical inventory status: Listed on major global chemical inventories like TSCA (United States) and REACH (Europe)
Workplace rules: Follow industry-specific best practices for training and PPE
Labeling: Hazard statements and pictograms required in alignment with international GHS regulations
Usage restrictions: No major blanket bans, but many organizations flag it for potential environmental persistence
