Methylene Chloride (MC)
Methylene Chloride, also known as Dichloromethane (DCM), is a clear, colorless, volatile liquid with a sweet, chloroform-like odor. It is widely used as an industrial solvent, especially in paint removers, degreasers, aerosol formulations, and chemical processing. Due to its volatility and toxicity, strict safety precautions are essential when handling.
CAS Number: 75-09-2
Chemical Name: Methylene Chloride
Other Names: Dichloromethane, DCM
Chemical Formula: CH₂Cl₂
Molecular Weight: 84.93 g/mol
Appearance: Clear, colorless liquid
Odor: Sweet, chloroform-like
Solubility: Slightly soluble (~1.3% at 20°C)
Boiling Point: ~39.6°C (103.3°F)
Melting Point: –96.7°C
Density: ~1.33 g/cm³ at 20°C
Flash Point: Non-flammable (per closed cup), but vapors can be harmful or form explosive mixtures with air under certain conditions
Vapor Pressure: ~350 mmHg at 20°C
Application in areas:
- Paint Stripping
- Active ingredient in paint removers for wood, metal, and automotive surfaces
- Solvent
- Used in the pharmaceutical, aerospace, and electronics industries
- Excellent solvent for resins, fats, waxes, and cellulose acetate
- Chemical Intermediate
- Used in the production of polycarbonates, pharmaceuticals, and aerosols
- Foam and Plastic Manufacturing
- Used in the production of polyurethane foams
Safety & Handling:
- Hazard Classification
- Hazard Class: Corrosive and Flammable Liquid (Class 8 / 3)
- UN Number: UN2789
- Health Hazards
- Inhalation risk: Can depress the central nervous system (CNS), causing dizziness, headache, and nausea
- Chronic exposure: Linked to liver, lung, and CNS damage, possibly carcinogenic
- Not flammable, but decomposes to phosgene, hydrogen chloride, and carbon monoxide when heated
GHS Classification:
- H302: Harmful if swallowed
- H312: Harmful in contact with skin
- H332: Harmful if inhaled
- H351: Suspected of causing cancer
- H319: Causes serious eye irritation
PPE Requirements:
- Air-purifying respirator or full-face supplied-air respirator
- Nitrile or butyl rubber gloves
- Chemical splash goggles or face shield
- Work in a fume hood or explosion-proof ventilated area
Storage Guidelines:
- Store in cool, dry, well-ventilated area
- Use corrosion-resistant, sealed containers
- Keep away from acids, alkalis, oxidizers, and heat
Environmental Concerns:
- Not biodegradable
- Volatile organic compound (VOC)
- Can contaminate groundwater and air
- Subject to strict regulations in many countries (e.g., EPA ban for certain consumer uses in the U.S.)
Packaging: Drum