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Substance Name: Α-Hexachlorocyclohexane
Chemical Formula: C6H6Cl6
Common Synonyms: alpha-HCH, alpha-Benzenehexachloride
Appearance: White crystalline solid with a musty odor
Use Cases: Historically found in agricultural pesticides and chemical manufacturing, today mostly flagged due to contamination concerns, not commercial use
Origin: Generated as a byproduct during hexachlorocyclohexane synthesis
Physical Hazards: Not flammable under normal conditions, decomposition can release toxic fumes such as hydrochloric acid and phosgene
Health Hazards: Harmful if swallowed, toxic by inhalation, skin and eye irritant, suspected liver and nervous system poison, recognized as a possible carcinogen (IARC Group 2B)
Environmental Hazards: Persistently toxic to aquatic life with long-term effects, builds up in organisms, accumulates up the food chain
Routes of Exposure: Inhalation, ingestion, dermal absorption
Main Ingredient: α-Hexachlorocyclohexane, usually more than 95% purity in technical mix
Unintentional Impurities: Minor quantities of gamma-, beta-, and delta-isomers
Health Notes: All isomers present toxicity, but α-HCH has gained attention for its environmental persistence and bioaccumulation
Inhalation: Move the person to fresh air, seek medical attention if symptoms persist, supply oxygen if breathing feels labored
Skin Contact: Remove contaminated clothing, wash skin thoroughly with soap and water, postpone reuse until thoroughly cleaned
Eye Contact: Rinse cautiously with water for several minutes, remove contact lenses if present, continue rinsing, consult a physician
Ingestion: Rinse mouth, call a poison control center or doctor immediately, avoid vomiting unless directed by medical personnel
Symptoms to Watch: Headache, dizziness, nausea, convulsions; chronic exposure often ties to liver damage and neurological effects like tremors or behavioral changes
Suitable Extinguishing Media: Use dry chemical, foam, or carbon dioxide; water spray cools containers but may spread contamination
Specific Hazards: Burning produces corrosive gases (hydrochloric acid), choking fumes (phosgene) that quickly become dangerous to first responders and bystanders
Protective Equipment: Wear self-contained breathing apparatus, protective clothing, avoid run-off entering drains
Personal Precautions: Prevent inhalation or skin contact, ventilate affected area
Environmental Precautions: Block entry to water bodies, sewers, or confined spaces, use barriers and absorbent materials
Cleanup Methods: Collect spilled material using non-sparking tools, place in labeled containers for disposal, decontaminate area with suitable detergents, avoid dispersal of dust or fine particulates
Safe Handling: Use with adequate local exhaust ventilation, prevent formation of dust, avoid direct contact or inhalation
Storage Conditions: Store in tightly closed containers in a cool, well-ventilated location, shielded from direct sunlight, incompatible with acids and strong oxidizers
Special Considerations: Keep away from children and unauthorized personnel, secure storage to prevent accidental releases or theft
Occupational Exposure Limits: No established OSHA PEL, ACGIH TLV suggests caution; some regions use workplace guidelines around 0.5 mg/m³
Engineering Controls: Use chemical fume hoods, local exhaust ventilation, dust collection
Personal Protective Equipment: Wear chemical-resistant gloves, goggles, impervious clothing, approved respiratory protection if dust or vapors present
Hygiene Practices: Wash hands thoroughly before eating, drinking, or smoking; launder contaminated clothing before reuse
State: Solid at room temperature
Melting Point: Approx. 157°C
Boiling Point: Sublimates before boiling
Solubility: Poorly soluble in water; dissolves in organic solvents
Odor: Distinct musty, chemical scent
Vapor Pressure: Low at room temperature
Stability in Light: Degrades slowly under sunlight
Chemical Stability: Stable under recommended storage conditions, decomposes with strong heating
Incompatibilities: Strong oxidizers, strong acids, some metals, bases
Hazardous Decomposition: Toxic chlorine compounds, phosgene, carbon monoxide
Conditions to Avoid: Open flames, prolonged exposure to heat, UV light
Acute Toxicity: Oral LD50 in rats around 562 mg/kg, inhalation of dust causes nausea and confusion
Chronic Effects: Linked to liver and nerve damage in laboratory animals, increased risk of cancer with long-term exposure, disrupts endocrine and immune function
Carcinogenic Status: IARC designates alpha-HCH as possibly carcinogenic to humans
Other Effects: Repeated contact causes dermatitis, cumulative health impacts not always immediately obvious, magnified in those with liver conditions
Toxicity to Aquatic Life: Highly toxic, causes fish kills and bioaccumulates in aquatic animals
Environmental Persistence: Breaks down slowly in soil and water, detected globally in sediments and food chains
Mobility: Can volatilize from soil or water surface, then travel long distances in the atmosphere
Bioaccumulation: Uptake by mammals, birds, and fish; shows up in animal fat and breast milk over long periods
Safe Disposal: Collect and label as hazardous waste, take to a permitted incineration facility that can treat chlorinated organics
Environmental Justice Points: Improper disposal threatens local communities through soil and water contamination, recognizing the lasting harm in areas still affected by pesticide waste dumping
Community Need: Remediation of contaminated sites, public awareness for safe handling, investment in long-term monitoring
UN Number: Regulated as a hazardous substance under global transport codes
Shipping Name: Environmental Hazard, Not Otherwise Specified
Hazard Class: Class 9 (Miscellaneous Dangerous Substances)
Precautions: Vehicles need proper labeling, emergency response information, spill-proof packaging
International Conventions: Covered under the Stockholm Convention as a persistent organic pollutant
Controls in the US and EU: Banned from most uses, listed as hazardous under TSCA and REACH
Worker Safety: OSHA hazard communication standards require employers to train workers, make safety data sheets available, use proper labels
Community Right-to-Know: Environmental agencies demand reporting of releases and site contamination for public health transparency
