The flash point of dichloromethane (DCM, CAS 75-09-2) is not particularly low. Under normal conditions, dichloromethane is non-flammable and is classified as a non-flammable or slightly flammable solvent. Many assessments indicate that it has no flash point or does not form a flammable vapor-air mixture until temperatures exceed 100°C.
Dichloromethane (DCM) Specifications Table
| Parameter | Specification |
|---|---|
| Product Name | Dichloromethane |
| Synonyms | DCM, Methylene Chloride |
| CAS Number | 75-09-2 |
| Molecular Formula | CH₂Cl₂ |
| Molecular Weight | 84.93 g/mol |
| Appearance | Colorless transparent liquid |
| Purity (GC) | ≥ 99.9% |
| Density (20°C) | 1.32 – 1.33 g/cm³ |
| Boiling Point | 39.6 – 40 °C |
| Melting Point | −96.7 °C |
| Flash Point | Non-flammable |
| Refractive Index (20°C) | 1.424 – 1.426 |
| Water Content | ≤ 0.02% |
| Acidity (as HCl) | ≤ 0.0005% |
| Residue on Evaporation | ≤ 0.002% |
| Color (APHA) | ≤ 10 |
| Odor | Mild, sweet chloroform-like odor |
Why Dichloromethane Does Not Have a Low Flash Point
Unlike many organic solvents, dichloromethane:
The two chlorine atoms suppress combustion and prevent the vapor from igniting.
It has low flammability under standard conditions, with a self-ignition temperature of 556°C (1032.8°F).
Under standard conditions, the vapors produced by dichloromethane are insufficient to sustain combustion.
Therefore, it is often used in processes where flammability must be minimized.
What is dichloromethane used for?
1. Caffeine extraction: Dichloromethane dcm is used to remove caffeine from coffee beans and tea leaves to produce decaffeinated coffee and tea.
2. Paint & varnish remover: Methylene chloride solvent acts as a strong solvent to strip paints and varnishes.
3. Industrial degreaser & cleaner: Dissolves grease and dirt; used for vapor degreasing and precision cleaning in the electronics industry.
4. Chemical & pharmaceutical manufacturing: Dichloromethane liquid Used in producing insecticides, herbicides, steroids, antibiotics, vitamins, and tablet coatings.
5. Aerosol solvent & propellant: Methylene chloride chemical serves as a solvent and propellant in spray paints, automotive products, adhesives, and hairsprays.
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People also ask
Is dichloromethane liquid flammable (CAS 75-09-2)?
Dichloromethane, also known as Methylene Chloride, is a volatile, colourless, non-flammable liquid with a sweet ether-like odour.
Is dichloromethane safer than other solvents?
Dichloromethane (DCM) is generally not safer than other solvents; it is highly toxic and often labeled a "higher hazard" substance. While non-flammable, it is highly toxic and often labeled a "higher hazard" substance. While non-flammable.
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