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Chemical Name: Dichloromethane
Other Names: Methylene Chloride
Chemical Formula: CH2Cl2
Common Uses: Paint removers, solvents for fats and resins, pharmaceutical manufacturing, aerosol propellants
Appearance: Clear, colorless liquid
Odor: Mild, sweet, chloroform-like scent
Boiling Point: About 40°C or 104°F
Vapor Pressure: High at room temperature, which increases inhalation risk
EPA Status: Classified as a hazardous air pollutant
Acute Health Effects: Breathing high concentrations can knock you out quickly. Eyes, nose, throat, and lungs will burn. Heads ache, logic slows, and dizziness sets in before you realize you're in trouble. Prolonged exposure causes irreversible liver and kidney damage.
Chronic Effects: Extended low-level contact increases risk for cancer. Handling it in small, regular doses, symptoms creep up with memory problems, fatigue, and possible heart issues
OSHA Regulation: Labeled as a potential occupational carcinogen
Flammability: Vapors ignite easily if a spark or flame is nearby, though liquid itself resists burning
Routes of Exposure: Inhalation stands out as the greatest threat, then absorption through skin, and finally, accidental ingestion
Signs of Overexposure: Headaches, nausea, sleepiness, confusion, skin redness, coughing, chest tightness
Chemical Makeup: More than 99% methylene chloride by weight
Impurities: Traces of phosgene, hydrogen chloride, and other chlorinated compounds can show up during production
Concentration Range: Most commercial versions sold with purity above 99%
Inhalation: Seek fresh air right away. If someone collapses, pull them to safety and start CPR if they’re not breathing
Eye Contact: Flush eyes with clean water for at least 15 minutes, using gentle continuous flow
Skin Contact: Remove contaminated clothes and wash skin thoroughly with soap and water; avoid solvents on skin
Ingestion: Never induce vomiting. Wash out mouth and get medical attention fast
Medical Notes: Doctors should monitor for respiratory distress, irregular heartbeat, and signs of toxicity in liver or kidneys
Extinguishing Media: Use dry chemical, carbon dioxide, or foam for fires in surrounding material; water stays effective mostly for cooling containers
Fire Hazards: Vapors travel along floors and can flash back easily; stays heavier than air
Toxic Combustion Products: Generates hydrogen chloride, carbon monoxide, and other toxic fumes under fire conditions
Protective Equipment: Firefighters need self-contained breathing apparatus and full protective clothing to avoid inhaling dangerous fumes
Spill Response: Clear area quickly, ventilate, and prevent vapor accumulation. Clean using absorptive material free from incompatible chemicals
Protective Equipment: Chemical-resistant gloves, splash goggles, and proper respirators limit risk
Environmental Precautions: Block drains and sewers. Small spills on land or water rapidly evaporate, but still cause environmental harm
Handling Practices: Always work in well-ventilated areas or use a fume hood. Wear proper gloves and goggles. Make sure containers are sealed tightly after each use
Storage Conditions: Keep it away from heat, sun, moisture, and incompatible chemicals like acids, bases, or reactive metals
Storage Materials: Store in steel or lined drums; some plastics degrade on contact
Transport Precautions: Shield containers from physical damage, check that caps are tight, and follow placarding rules for hazardous shipments
Permissible Exposure Limits: OSHA currently allows 25 ppm over an eight-hour shift, but some experts call this limit too high
Engineering Controls: Install local exhaust ventilation in areas where vapors are released
Protective Equipment: Gloves made from butyl rubber or Viton, goggles or face shield, and respiratory protection (such as a full-face air-purifying respirator with organic vapor cartridges)
Hygiene Measures: Wash hands before meals or breaks. Never eat, drink, or smoke in areas with chemical exposure
Physical State: Volatile, colorless liquid
Solubility: Slightly soluble in water, highly soluble in most organic solvents
Density: About 1.33 grams per cubic centimeter
Evaporation Rate: Quick, making airborne concentrations a risk even with small spills
Vapor Density: Heavier than air, pools close to the floor
Melting Point: Around minus 95°C
Chemical Stability: Remains stable in sealed containers away from heat and light
Reactive Hazards: Breaks down rapidly in presence of strong bases, acids, or metals such as aluminum
Hazardous Polymerization: Not known to form dangerous polymers under normal use
Decomposition Products: Forms phosgene, hydrogen chloride, and carbon monoxide when burned
Acute Toxicity: Rapid respiratory depression and central nervous system effects with high exposure
Chronic Toxicity: Repetitive low exposure tied to increased cancer rates and long-lasting organ damage
Routes of Entry: Absorption through lungs, skin, and rarely swallowed by accident
Target Organs: Nervous system, liver, and heart suffered most damage in case studies
Sensitization: No clear evidence of allergic reaction in most people, but skin rashes can develop
Carcinogenicity: Considered a probable human carcinogen by major health agencies
Environmental Mobility: Does not linger long in air, moving quickly through the atmosphere before breaking down
Water Impact: Damages aquatic life if it enters bodies of water, acting as a toxin to fish and invertebrates
Bioaccumulation: Only trace buildup in living creatures, but repeated small doses pile up in closed spaces
Soil Impact: Seeps into soil, moving into groundwater where it can contaminate drinking water supplies
Ozone Effect: Minor ozone-depleting properties compared to CFCs, but still contributes under certain conditions
Waste Treatment Methods: Must be collected as hazardous waste; incineration in specialized facilities destroys toxic compounds
Prohibited Actions: Never pour down the drain, into soil, or normal trash; improper disposal could contaminate water or air
Recycling: Reclaimed through distillation in controlled chemical plants, reducing the need for new production
DOT Classification: Hazardous material, requires placarding and documentation in transit
Packing Group: Classifies as Packing Group III, indicating medium hazard
Shipping Precautions: Ship upright, label clearly, and keep separate from incompatible goods; shipment delays or accidents can increase community risk
Transport Emergency: In case of road or rail emergencies, first responders must wear breathing protection and stop vapor spread
Occupational Regulations: OSHA, NIOSH, and EPA all classify dichloromethane as hazardous, listing it under workplace safety and air quality laws
Community Notification: Releases must be reported under the Emergency Planning and Community Right-to-Know Act in amounts exceeding threshold limits
Restricted Use: Industrial users must meet strict ventilation and personal protection requirements, and some applications have limits or bans in public-facing products
International Status: Regulated by REACH in Europe and similar agencies elsewhere, with tough rules on workplace exposure, shipping, and environmental release
