Frequently Asked Questions About Dichloromethane (DCM) CAS 75-09-2

Introduction

Dichloromethane (DCM), also known as methylene chloride, is a colorless, volatile chlorinated solvent widely used in pharmaceutical manufacturing, paint stripping, metal cleaning, adhesive production, and chemical processing. Due to its excellent solvency and low boiling point, DCM remains one of the most important industrial solvents worldwide.

This FAQ guide answers the most common questions about dichloromethane, including its properties, applications, safety requirements, storage recommendations, and regulatory status.

Q1.What Is Dichloromethane CAS 75-09-2?

A: Dichloromethane (CH₂Cl₂), also known as methylene chloride, is a chlorinated organic solvent with CAS Number 75-09-2. It is a colorless liquid with a molecular weight of 84.93 g/mol and a boiling point of 39.6°C. Due to its ability to dissolve oils, resins, waxes, polymers, and many organic compounds, dichloromethane is widely used in chemical processing, pharmaceutical manufacturing, metal cleaning, and extraction applications.

Other common names include:

• Methylene Chloride
• DCM
• Methane Dichloride

 Related Products: Industrial Grade Dichloromethane (DCM)/Methylene Chloride (CAS 75-09-2) High-Purity Solvent
 Related Reading: What Is Dichloromethane (DCM, CAS No. 75-09-2)? A Complete Technical and Safety Guide

Q2.What Is The Chemical Formula Of Dichloromethane?

A: The molecular formula of dichloromethane is: CH₂Cl₂

Its molecular weight is: 84.93 g/mol

Each molecule contains one carbon atom, two hydrogen atoms, and two chlorine atoms. The presence of chlorine contributes to its solvent properties and relatively high density compared with many hydrocarbon solvents.

Q3.What Is Dichloromethane Used For?

A: Dichloromethane is used as a process solvent, extraction solvent, and cleaning agent across multiple industries.

Major applications include:

1. Pharmaceutical manufacturing for extraction and purification processes
2. Paint and coating removers for dissolving cured coatings
3. Adhesive and sealant production
4. Polyurethane foam manufacturing as a blowing agent and process solvent
5. Metal cleaning and degreasing operations
6. Chemical synthesis and reaction media
7. Extraction of natural products, flavors, and specialty chemicals

Its low boiling point of 39.6°C allows rapid solvent removal after processing, reducing drying time in industrial operations.

Q4.What Is The Boiling Point Of Dichloromethane?

A: The normal boiling point of dichloromethane is: 39.6°C (103.3°F)

This low boiling point enables efficient evaporation during extraction, cleaning, and manufacturing processes. It also allows easier solvent recovery through distillation compared with higher-boiling solvents.

Q5.What Is The Density Of Dichloromethane?

A: At 20°C, the density of dichloromethane is approximately: 1.325 g/cm³

Because its density is greater than water (1.0 g/cm³), dichloromethane forms the lower layer when mixed with water in liquid-liquid extraction systems.

 Related Reading: CAS 75-09-2 DCM Dichloromethane: Formula, Structure, Properties, and Uses

Q6.Is Dichloromethane Soluble In Water?

A: Dichloromethane has limited solubility in water.

Water solubility: 13–20 g/L at 20°C

It is miscible or highly soluble in many organic solvents, including: ethanol, acetone, ethyl acetate, toluene. This combination of low water solubility and strong organic solvency makes DCM useful for extraction and separation processes.

Q7.Is Dichloromethane Flammable?

A: Dichloromethane is classified as a non-flammable liquid under most transportation and storage regulations.

Key facts include:

• Flash point: None under standard test conditions
• Autoignition temperature: Approximately 556°C
• Vapors may decompose when exposed to high temperatures or open flames

Thermal decomposition can generate hazardous gases, including:

• Hydrogen chloride (HCl)
• Phosgene (COCl₂)
• Adequate ventilation and temperature control should be maintained during handling.

Q8.Is Dichloromethane Hazardous?

A: Yes. Dichloromethane is classified as a hazardous chemical and requires controlled handling in industrial environments.

Potential health effects include:

1. Eye irritation from liquid or vapor exposure
2. Skin irritation after prolonged contact
3. Respiratory tract irritation
4. Central nervous system depression
5. Dizziness and headaches at elevated vapor concentrations
6. Loss of consciousness in cases of excessive exposure
7. Workplace exposure should be controlled through ventilation systems, monitoring programs, and appropriate personal protective equipment.

Q9.Can Dichloromethane Cause Cancer?

a: Several regulatory authorities classify dichloromethane as a suspected or potential human carcinogen.

Examples include:

• IARC: Group 2A (Probably carcinogenic to humans)
• U.S. EPA: Likely to be carcinogenic to humans under certain exposure conditions

These classifications are based on toxicological studies and occupational exposure data. Industrial users should comply with applicable occupational exposure limits and implement engineering controls to minimize inhalation exposure.

Q10.How Should Dichloromethane Be Stored?

A: Dichloromethane should be stored under conditions that minimize evaporation, contamination, and chemical degradation.

Recommended storage practices include:

• Store in tightly closed containers
• Maintain storage temperatures below 30°C where practical
• Keep in a dry, well-ventilated area
• Protect from direct sunlight and heat sources
• Segregate from strong oxidizing agents and reactive chemicals
• Use corrosion-resistant storage equipment compatible with chlorinated solvents
• Storage facilities should comply with local chemical storage regulations.

Q11.What Packaging Options Are Available For DCM?

A: Common industrial and export packaging formats include:

• 250 kg steel drums
• 270 kg steel drums
• 1,250 kg IBC tanks
• ISO tanks for bulk shipments

The selected packaging depends on order volume, transportation mode, destination requirements, and unloading facilities at the receiving site.

Q12.What Is The UN Number For Dichloromethane?

A: For international transportation, dichloromethane is classified as:

• UN Number: UN1593
• Proper Shipping Name:
• Dichloromethane

Hazard Class: 6.1 (Toxic Substance)

International shipments must comply with applicable regulations, including:

• IMDG Code (Sea Transport)
• ADR (Road Transport)
• IATA Dangerous Goods Regulations (Air Transport)

Q13.Is Dichloromethane Restricted Or Banned?

A: Dichloromethane is regulated rather than universally banned.

Examples of regulatory controls include:

1. Restrictions on consumer paint remover products in the United States
2. Specific occupational exposure requirements in the European Union
3. Licensing, reporting, or handling requirements in certain countries
4. Industrial applications such as pharmaceutical manufacturing, chemical processing, and metal cleaning remain permitted in many jurisdictions when regulatory requirements are met.
5. Importers should verify current regulations in the destination market before purchase.

 Related reading: Is the chemical dichloromethane (CAS 75-09-2) banned in the UK?

Conclusion

Dichloromethane (DCM) CAS 75-09-2 remains one of the most widely used industrial solvents due to its exceptional solvency, low boiling point, and broad application range. Understanding its properties, safety requirements, transportation regulations, and storage practices is essential for safe and efficient industrial use.

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