Difluoromethane

Difluoromethane

Names
Systematic IUPAC name Difluoromethane
Other names Carbon fluoride hydride Methylene difluoride Methylene fluoride Freon-32
Identifiers
CAS Number	75-10-5 Y
3D model (Jmol)	Interactive image
Abbreviations	HFC-32 R-32 FC-32
Beilstein Reference	1730795
ChEBI	CHEBI:47855 Y
ChEMBL	ChEMBL115186 Y
ChemSpider	6105 Y
ECHA InfoCard	100.000.764
EC Number	200-839-4
Gmelin Reference	259463
MeSH	Difluoromethane
PubChem	6345
RTECS number	PA8537500
UNII	77JW9K722X Y
UN number	3252
InChI InChI=1S/CH2F2/c2-1-3/h1H2 Y Key: RWRIWBAIICGTTQ-UHFFFAOYSA-N Y InChI=1/CH2F2/c2-1-3/h1H2 Key: RWRIWBAIICGTTQ-UHFFFAOYAC
SMILES FCF
Properties
Chemical formula	CH2F2
Molar mass	52.02 g·mol−1
Appearance	Colorless gas
Density	1.1 g cm−3
Melting point	−136 °C (−213 °F; 137 K)
Boiling point	−52 °C (−62 °F; 221 K)
log P	-0.611
Vapor pressure	1518.92 kPa (at 21.1 °C)
Hazards
Safety data sheet	See: data page MSDS at Oxford University
EU classification (DSD)	F
R-phrases	R11
S-phrases	S9, S16, S33
NFPA 704	4 1 1
Autoignition temperature	648 °C (1,198 °F; 921 K)
Supplementary data page
Structure and properties	Refractive index (n), Dielectric constant (εr), etc.
Thermodynamic data	Phase behaviour solid–liquid–gas
Spectral data	UV, IR, NMR, MS
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

Methylene difluoride
Methylene fluoride

R-32
FC-32

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 It is based on methane, except that two of the four hydrogen atoms have been replaced by fluorine atoms, hence the formula is CH₂F₂ instead of CH₄ for normal methane.

Difluoromethane is a refrigerant that has zero ozone depletion potential. Difluoromethane in a zeotropic (50%/50%) m/m mixture with pentafluoroethane (R-125) is known as R-410A, a common replacement for various chlorofluorocarbons (aka Freon) in new refrigerant systems, especially for air-conditioning. The zeotropic mix of difluoromethane with pentafluoroethane (R-125) and tetrafluoroethane (R-134a) is known as R-407A through R-407E depending on the composition. Likewise the azeotropic (48.2%/51.8% m/m) mixture with chlorotrifluoromethane (R13). As a refrigerant difluoromethane is classified as A2L - slightly flammable. Although it has zero ozone depletion potential, it has global warming potential 675 times that of carbon dioxide, based on a 100-year time frame.