Difluoromethane is an organic compound whose formula is CH2F2. It is a colorless gas and is often used as a refrigerant and dry etching agent.

Chemical formula: CH2F2
Molecular weight: 52.023
CAS Number: 75-10-5
MDL number: MFCD00039283
EINECS Number: 200-839-4
RTECS No.: PA8537500

Physical and Chemical Properties
Melting point: −136 °C
Boiling point: −51.6 °C
Refractive index: 1.195
Critical temperature: 78.4℃
Critical pressure: 5.808MPa
Appearance: colorless gas
Solubility: insoluble in water, soluble in ethanol

Molecular Structure Data
Molar Refractive Index: 16.38
Molar volume (cm3/mol): 67.8
Isotonic specific volume (90.2K): 148.8
Surface tension (dyne/cm): 23.1
Polarizability (10-24cm3): 6.49

Use
Difluoromethane is a coolant with zero ozone depletion potential. Difluoromethane and pentafluoroethane form an azeotrope (known as R-410A) that is used as a replacement for chlorofluorocarbons (also known as Freon) in new coolant systems, primarily as a replacement for HCFC-22 , as a compound medium and low temperature mixed refrigerant. Although it has zero ozone depletion potential, it has a high global warming potential, which is 550 times that of carbon dioxide on a per 100-year basis.