Chinese name dichloromethane (Methylene chloride), other name DCM Chemical formula CH2Cl2 molecular weight 84.93 CAS registration number 75-09-2EINECS registration number 200-838-9 melting point -97 ° C boiling point 39.75 ℃ at 760 mm Hg water-soluble slightly soluble Water density 1.325 g / mL at 25 ° C (lit.) Appearance Colorless and transparent volatile liquid Flash point 30 [5] Application of industrial raw materials Safety description Specific target organ toxicity Hazard description Hazardous gases released after heating for a long time Transportation No. UN 1593 6.1 / PG 3 Hazard category code Xn, T, F Safety instructions S23-S24 / 25-S36 / 37-S45-S16-S7 Evaporative heat 28.82 kJ / mol (25 ℃) Upper explosion limit% V / V19 Lower explosion limit % V / V12

1. Properties: colorless transparent liquid, with aromatic smell.

2. Melting point (℃): -97

3. Boiling point (℃): 39.8

4. Relative density (water = 1): 1.33

5. Relative vapor density (air = 1): 2.93

6. Saturated vapor pressure (kPa): 46.5 (20 ℃)

7. Heat of combustion: 106.8kcal / mol (depending on oxygen, 25 ℃) [7]

8. Critical temperature (℃): 237

9. Critical pressure (MPa): 6.08

10. Octanol / water partition coefficient: 1.25

11. Flash point (℃): 30 [5]

12. Ignition temperature (℃): 556

13. Upper explosion limit (%): 23