Dichloromethane (Methylene Chloride)

   CAS No.: 75-09-2
   Synonyms / IUPAC Name: Dichloromethane; Methylene chloride
   Molecular Formula: CH₂Cl₂
   Molecular Weight: ~84.93 g/mol
   Appearance: Colorless, volatile liquid with a mild ether-like odor.

Physicochemical Properties (Typical)

• Boiling Point: ~39.6 °C
• Melting Point: ~–97 °C
• Density: ~1.33 g/cm³ at 20 °C
• Vapor Pressure: ~47 kPa at 20 °C
• Solubility in Water: Slightly soluble; miscible with most organic solvents.
• Refractive Index: n²⁰ᴰ ≈ 1.424
• Flash Point: Non-flammable (closed cup)
• Stability: Stable under normal handling; decomposes on strong heating or contact with strong bases to form corrosive or toxic gases.

Purity & Quality Standards

• Typical Purity: ≥99.95% (GC)
• Appearance: Clear, free from suspended matter or haze.
• Acidity (as HCl): ≤0.0005%
• Moisture Content: ≤0.01%
• Specification Standard: GB/T 4117-2008 or equivalent analytical grade.
• Storage Recommendation: Keep containers sealed in a cool, well-ventilated place; avoid direct sunlight and prolonged heat exposure.

Applications / Uses

• Industrial Solvent: Used for extraction, degreasing, paint stripping, and as reaction medium in fine-chemical synthesis.
• Pharmaceutical & Cosmetic Manufacturing: Serves as solvent for coatings, encapsulation, and purification processes.
• Polymer & Resin Production: Applied in PVC and polyurethane systems for processing and cleaning.
• Electronics & Precision Cleaning: Effective for removal of oils, waxes, and flux residues.
• Laboratory Applications: Used as chromatographic solvent and for extraction of natural products.

Safety & Handling

• Flammability: Non-flammable but forms toxic gases (e.g., phosgene, HCl) when exposed to flame or high temperature.
• Health Hazards:
• Inhalation: May cause dizziness, headache, or central nervous system depression.
• Skin Contact: May cause irritation or dryness with repeated exposure.
• Eye Contact: Causes irritation and tearing.
• Chronic Exposure: Possible liver and kidney effects after long-term high-level exposure.
• Precautions:
• Use only in well-ventilated areas or under fume extraction.
• Wear appropriate protective gloves, goggles, and respirator.
• Keep away from open flames and reactive materials.
• Follow all local occupational hygiene regulations.
• Reactivity / Incompatibilities: Avoid strong oxidizing agents, strong alkalis, and reactive metals such as sodium or potassium.

Packaging & Storage

• Packaging: Typically supplied in 250 kg or 270 kg metal drums; bulk ISO-tank options available.
• Storage Conditions: Store in a cool, dry, well-ventilated place below 30 °C. Protect from sunlight and moisture.
• Shelf Life: Stable for ≥12 months under recommended conditions; verify container integrity before use.