What is Industrial Dichloromethane (DCM)?

Dichloromethane (CAS No. 75-09-2), commonly known as methylene chloride, is an organochlorine compound with the formula CH2Cl2. This colorless, volatile liquid with a moderately sweet, chloroform-like aroma is widely used as a solvent. Despite its limited miscibility in water, it is highly effective at dissolving a wide range of organic compounds, making it an indispensable tool in modern chemical manufacturing.

Dichloromethane Chemical and Physical Properties

Field	Value
Chemical Name	Dichloromethane
Synonyms	Methylene Chloride; DCM
CAS Number	27639
EC Number	200-838-9
UN Number	1593
HS Code	2903.12
Molecular Formula	CH2Cl2

Molecular Weight: 84.93 g/mol
Boiling Point: 39.6 °C (103.3 °F)
Density: 1.326 g/cm³
Vapor Pressure: 47 kPa at 20 °C
Solubility: 13 g/L in water; highly soluble in alcohol and ether.

Methylene Chloride Manufacturing Process

Methylene chloride is primarily produced by the chlorination of methane or chloromethane at high temperatures (400–500 °C). We delve into the hydrochlorination process and the distillation steps required to separate DCM from co-products like chloromethane, chloroform, and carbon tetrachloride. Understanding the purity of the precursor methane gas is vital for ensuring the final DCM product meets international standards.

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Dichloromethane Major Industrial Applications

Pharmaceutical Industry:

In the pharmaceutical sector, Methylene chloride DCM is a preferred reaction solvent. It is used in the synthesis of vitamins, antibiotics (like cephalosporins), and as a solvent for coating tablets. Its low boiling point allows for easy removal during the drying process without damaging heat-sensitive active pharmaceutical ingredients (APIs).

Paint Stripping and Coating Removal:

Historically, DCM has been the “gold standard” for paint removal. Its high volatility and ability to swell and lift various coatings (varnishes, enamels, lacquers) make it efficient for restoring furniture or maintaining aircraft and automotive parts.

Polyurethane Foam Production:

Methylene chloride DCM acts as a blowing agent in the production of flexible polyurethane foams. It helps control the temperature during the exothermic reaction and ensures the desired density and elasticity of the foam used in mattresses and upholstery.

Metal Cleaning and Degreasing:

Due to its strong solvency power, Dichloromethane DCM is used in vapor degreasing for precision metal parts in the aerospace and automotive industries, ensuring surfaces are free from oils and contaminants before further processing.

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Dichloromethane Quality Standards and Purity Grades

When sourcing dichloromethane (DCM), buyers must distinguish between:
Technical Grade: Used for general solvent applications.
Reagent Grade: Higher purity for laboratory use.
Pharma Grade: Strict adherence to USP or BP standards, ensuring minimal residue and high purity (>99.9%).

Dichloromethane Logistics and Packaging

Dichloromethane is classified as a Class 6.1 Toxic Substance (UN1593). Our packaging and logistics comply with the following requirements:
Packaging: 250kg or 270kg steel drums, or ISO tanks for bulk shipping.
Labeling: GHS compliance and SDS documentation.
Shipping: Proper stowage away from heat sources.

How to Choose a Reliable Chinese Supplier

For international buyers, sourcing from China—the world’s largest producer—requires vetting. Look for suppliers with:
ISO 9001/14001 certification.
Third-party inspections (SGS/BV).
Proximity to major ports like Qingdao or Tianjin to reduce domestic freight costs.

GNEE BIO is an international company integrating manufacturing and supply operations. We primarily supply chemical solvents; Dichloromethane is one of our flagship products. We welcome your inquiries.