Dichloromethane

Molecular formula - CH₂CL₂, molecular weight - 84.93. Dichloromethane is a colorless, transparent and volatile liquid with an ether-like odor and sweet taste. Relative density 1.326Kg/L (D420). Boiling point 40.4℃. Melting point -96.7℃. Autoignition point is 615℃. It is slightly soluble in water, soluble in ethanol and ether, and is toxic and has anesthetic and stimulating effects.

CAS No.

75-09-2
HS No.

290312
UN No.

1593
IMDG Class

6.1

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Descriptions

Molecular formula - CH₂CL₂, molecular weight - 84.93.

Dichloromethane is a colorless, transparent and volatile liquid with an ether-like odor and sweet taste. Relative density 1.326Kg/L (D420). Boiling point 40.4℃. Melting point -96.7℃. Autoignition point is 615℃. It is slightly soluble in water, soluble in ethanol and ether, and is toxic and has anesthetic and stimulating effects. Dichloromethane undergoes a hydrolysis reaction with water, and the finished dichloromethane contains stabilizers to prevent hydrolysis. Dichloromethane will produce an explosive mixture when it encounters high concentrations of oxygen, but it is not flammable. It is one of the solvents commonly used in industry with low toxicity, non-flammability and low boiling point.

Technical Data Sheet

Item	Data
Item	Excellent	Qualified
CH₂CL₂ %, ≥	99.90	99.5
Water %, ≤	0.010	0.020
Acid (Such as HCl) %, ≤	0.0004
Chroma/Hazen unit (Pt-Co color number), ≤	10
Evaporation residue %, ≤	0.0005
Remark: The amount of stabilizer added is not included in the mass fraction of dichloromethane. The above refers to quality standards：GB/T4117-2008

Application

Dichloromethane is used in non-flammable solvents, such as metal paint cleaning, film release agents, metal degreasing agents, cellulose triacetate solvents, etc. Solvents that can be used in the manufacture of film, aerosols, antibiotics, and vitamins. It can be used as flame retardant and engineering plastic foaming agent. It can be used to replace F11 and F12 products, and can also be used to synthesize fine chemical products.

Storage Methods

Methylene chloride should be packed in galvanized iron barrels, black iron barrels or tank cars in sealed packages. The filling volume is 80% of the container. Nitrogen protection can be provided for users with special requirements. Storage should be placed in a dry and cool place, and the warehouse should have ventilation facilities to avoid contact with high concentrations of oxygen or oxides, and avoid contact with moisture to prevent hydrolysis.

Security warning

The explosion limit of methylene chloride in air is 8.1% to 17.2%, and it is a flammable chemical. High concentration and long-term exposure may cause dizziness, drowsiness, nausea, tinnitus or numbness of limbs. If moved to fresh air, the symptoms will recover quickly without causing lasting damage. Splashing into eyes can cause pain and irritation, and long-term contact with skin can cause dermatitis.

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