Dichloromethane (DCM / MDC)

Dichloromethane is a volatile, colorless liquid with a sweet odor, widely used as a solvent in industrial and laboratory settings. Though not highly flammable, it poses significant health risks, including potential carcinogenicity, organ damage, and CNS depression. Careful handling and regulatory compliance are required.

CAS No: 75-09-2

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Formula

CH₂Cl₂

Main Uses

Industrial Solvent, Laboratory Reagent

Appearance

Clear, Colorless Liquid

Handling

Toxic and Carcinogenic

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Safety Highlights

Dichloromethane is classified as hazardous and carcinogenic. Exposure may lead to severe health issues through inhalation, ingestion, or prolonged contact. Proper PPE, ventilation, and regulatory adherence are essential for safe use.

Flammable Liquid

Classified by IARC (Group 2A) and OSHA as a suspected human carcinogen. California Prop 65 listed.

Toxic on Contact

Inhalation may cause dizziness, nausea, CNS depression, and unconsciousness. Severe cases may be fatal.

Corrosive Agent

Prolonged or repeated exposure may damage the liver, kidneys, and blood-forming organs.

Emergency Measures

Causes serious irritation. Can be absorbed through skin.

Proper Storage

If inhaled, move to fresh air. If in eyes or on skin, rinse with water for at least 15 minutes. Get medical help if symptoms persist.

Regulatory ID

Store in a cool, dry, ventilated, and locked area. Keep containers tightly closed and away from aluminum or incompatible materials.

Environmental Care

UN No: UN1593 | DOT Hazard Class: 6.1 (Toxic Substance) | Packing Group: III

PPE Required

Use nitrile gloves, chemical safety goggles or face shield, chemical-resistant clothing, and a respirator with AX filters (low-boiling organic vapors).

Frequently Asked Questions

While effective in these roles, it poses serious health risks, particularly through inhalation, and is subject to strict regulatory controls. The following FAQs address its common uses, hazards, regulations, and safe handling practices.

What is Dichloromethane used for?

Dichloromethane is used in industrial applications like paint stripping, metal cleaning, and as a solvent in adhesives and pharmaceuticals.

Is Dichloromethane flammable?

Not classified as flammable but combustible under certain conditions. Autoignition temperature: 556°C. It has a high vapor pressure and forms explosive mixtures with air.

How hazardous is it to inhale DCM vapors?

Very hazardous. DCM vapors can depress the central nervous system, leading to dizziness, confusion, unconsciousness, and death at high concentrations.

Is DCM banned for consumer use?

Yes. Under TSCA Section 6, DCM is banned for consumer paint and coating removal. After 2025, its distribution is restricted to specific industrial applications only.

How should Dichloromethane be stored and handled?

Store in a tightly sealed container in a cool, well-ventilated, non-aluminum facility. Always use chemical fume hoods and appropriate PPE during handling.

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