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Difluoromethane, also called HFC-32 or R-32, is an organic compound of the dihalogenoalkane variety. It is based on methane, except that two of the four hydrogen atoms have been replaced by fluorine atoms. Hence the formula is CH₂F₂ instead of CH₄ for normal methane.

Physical properties

Property	Value
Critical pressure (pc)	5.83 MPa
Critical temperature (Tc)	78.45 °C (351 K)
Compressibility factor (Z)	0.9863
Heat capacity at constant pressure (Cp) at 21 °C (70 °F)	0.043 kJ·mol−1·K−1
Heat capacity at constant volume (CV) at 21 °C (70 °F)	0.034 kJ·mol−1·K−1
Heat capacity ratio (κ)	1.253

Uses

Difluoromethane is a refrigerant that has zero ozone depletion potential. Difluoromethane in an azeotropic mixture with pentafluoroethane is known as R-410A, a common replacement for various chlorofluorocarbons (aka Freon) in new refrigerant systems. Although it has zero ozone depletion potential, it has high global warming potential, 550 times that of carbon dioxide, based on a 100-year time frame

See also

• Haloalkane
• Halomethane
• Dichloromethane
• Dibromomethane
• Diiodomethane
• Fluoromethane
• Fluoroform (Trifluoromethane)
• Tetrafluoromethane

External links

• Flammability Measurements of Difluoromethane in Air at 100° C
• Difluoromethane at Gas Encyclopaedia
• IR absorption spectra