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Chemical Name: 1,2-Dichloroethane
Common Names: Ethylene dichloride, EDC
Formula: C2H4Cl2
Appearance: Clear, colorless liquid with a sweet chloroform-like scent
Odor Threshold: Noticeable at low concentrations, pungent and sweet
Uses: Seen in vinyl chloride production, chemical synthesis, cleaning agents, and as a solvent; shows up in many industrial settings where robust precautions matter for worker and environmental safety
Main Risks: Highly flammable, toxic through inhalation, ingestion or skin absorption; causes serious eye and skin irritation; suspected carcinogen
Acute Effects: Drowsiness, dizziness, nausea, vomiting, possible central nervous system effects; severe cases lead to liver and kidney damage
Long-Term Concerns: Repeated or prolonged exposure may impact organ health, create cancer risk, and harm reproductive systems; known to contaminate air and water near discharge points
Precautionary Statements: Users should monitor air quality, maintain tight containment, and minimize vapors to protect anyone nearby, especially in confined or poorly ventilated spaces
Main Component: 1,2-Dichloroethane (typically >99% by weight)
Impurities: Trace chlorinated hydrocarbons may appear, dependent on production method
Additives: Not typically required for normal storage or transportation; presence of inhibitors would be rare
Inhalation: Remove to fresh air immediately; rest and monitor for respiratory distress; provide oxygen if breathing is difficult; seek medical attention for confusion or unconsciousness
Skin Contact: Rinse thoroughly with water; remove contaminated clothing quickly; wash with soap; seek care if irritation or symptoms persist
Eye Contact: Rinse cautiously with water for several minutes; check for contact lenses and remove if possible; seek emergency care if pain or blurred vision develops
Ingestion: Rinse mouth without inducing vomiting; never give anything by mouth to an unconscious person; medical supervision must follow immediately
Extinguishing Media: Use water spray, dry chemical, foam, or carbon dioxide for small fires; water fog can cool containers exposed to heat
Hazards: Vapors may travel along the ground and flash back; combustion releases hydrogen chloride, phosgene, and other toxic gases
Precautions: Firefighters need full protective gear including self-contained breathing apparatus; keep unauthorized personnel away and prevent further vapor release; runoff from firefighting can contaminate waterways
Containment: Use non-sparking tools to contain liquid in dikes; ventilate area to reduce vapor concentration
Cleanup: Absorb spill with inert material like sand or vermiculite; avoid direct contact; collect residue in sealed containers
Environmental Considerations: Prevent entry to sewers or surface water; alert authorities in case of large discharges; contaminated cleanup materials should be treated as hazardous waste
Personal Protection: Protective clothing, gloves resistant to chlorinated solvents, goggles or face shield, and respirator as required depending on spill size
Handling: Work in well-ventilated areas; avoid all contact with skin and eyes; use explosion-proof equipment and grounded containers; never reuse empty containers since residue remains hazardous
Storage: Store in tightly closed drums in cool, dry, well-ventilated spaces; separate from oxidizers, acids, and alkalis; safeguard from heat, spark, flame, and static electricity; regular inspection for leaks reduces risk of unexpected exposure
Engineering Controls: Local exhaust ventilation at points of use; continuous air monitoring recommended
Worker Protection: Impermeable gloves (like nitrile or viton), chemical goggles, face shield, flame-resistant clothing for splash potential; certified respirator for any risk of vapor above recommended limits
Occupational Exposure Limits: NIOSH REL: 1 ppm (4 mg/m³); OSHA PEL: 50 ppm (200 mg/m³); ACGIH TLV: 10 ppm (40 mg/m³), reflecting attention required for chronic and acute risk mitigation
Boiling Point: About 83.5°C (182.3°F)
Melting Point: -35°C (-31°F)
Vapor Pressure: Significant at room temperature; encourages rapid vapor release
Solubility in Water: Low; mixes well with most organic solvents
Density: Around 1.25 g/cm³
Volatility: Easily forms vapor clouds especially if spilled; heavier-than-air vapors collect in low areas
Other Properties: Not corrosive to steel, but attacks some plastics, rubbers, and coated surfaces
Chemical Stability: Stable under normal storage and use conditions with adequate containment
Reactivity: Reacts violently with strong bases, strong oxidizers; generates toxic decomposition products like phosgene and hydrogen chloride on heating
Polymerization: Unlikely without catalyst or inhibitor breakdown, but high temperatures and contamination may trigger it
Hazardous By-Products: Under fire or thermal stress, phosgene and chlorine gas may evolve
Acute Exposure Effects: Causes eye, skin, and respiratory tract irritation; CNS depression marked by dizziness, confusion, or unconsciousness; high doses cause organ toxicity
Chronic Effects: Carcinogenicity documented in human and animal studies – classified as Group 2B by IARC; repeated exposures linked to liver and kidney injury; long-term inhalation appears to reduce fertility and development in animal studies
Sensitization: Not known to sensitize skin or airways, but repeat irritation is common
Routes of Exposure: Mainly by inhalation of vapors, less commonly by dermal contact or accidental ingestion
Environmental Fate: Degrades slowly in soil and water; tends to persist when spilled into groundwater
Aquatic Impact: Harmful to aquatic organisms at low concentrations; possible bioaccumulation
Soil and Air Spread: Volatile and mobile, risk of offsite migration especially through leaks; not easily broken down by sunlight
Regulatory Attention: Included in many hazardous substance listings; strict rules for land, water, and atmospheric emissions reflect its recognized long-term risks
Preferred Methods: Incineration in approved hazardous waste facilities; treatment technologies like chemical degradation only under strict regulatory control
Container Handling: Triple rinse before disposal; avoid landfill unless rigorously approved for chlorinated wastes
Regulatory Compliance: Shipping and destroying EDC as hazardous waste; improper disposal leads to fines, site liability, and environmental contamination
Shipping Classifications: Regulated as a flammable liquid and toxic substance; strict packaging, labeling, and documentation required
Labeling: Requires hazard communication labels for flammability, toxicity, and environmental hazard symbols
Precautions in Transit: Moves only in approved containers; always shielded from heat and ignition sources; accident protocols in place for highway, rail, or waterborne shipments
Incident Reporting: Obligatory notification for leaks, spills, or unauthorized discharges during transport
Workplace Exposure: OSHA, NIOSH, and ACGIH set exposure standards to limit chronic and acute harm
Environmental Release: Listed under CERCLA and other national hazardous materials acts; spills trigger mandatory clean-up and reporting requirements
Product Restrictions: Some jurisdictions restrict or prohibit uses except for essential feedstock or process chemistry roles; strict record-keeping and disposal obligations for all users
Labeling Laws: Mandated warnings for workplaces and consumer products wherever EDC might be present or manufactured; robust compliance helps prevent forgotten and ‘legacy’ sources of exposure
