1,1-Difluoroethylene

1,1-Difluoroethylene

Names
IUPAC name 1,1-Difluoroethene
Other names Difluoro-1,1-ethylene; R-1132a; Halocarbon 1132 A; Freon 1132A; Vinylidene difluoride; Vinylidene fluoride
Identifiers
CAS Number	75-38-7 Y
3D model (Jmol)	Interactive image
Abbreviations	VDF
ChemSpider	13836545
ECHA InfoCard	100.000.789
InChI InChI=1S/C2H2F2/c1-2(3)4/h1H2 Key: BQCIDUSAKPWEOX-UHFFFAOYSA-N InChI=1/C2H2F2/c1-2(3)4/h1H2 Key: BQCIDUSAKPWEOX-UHFFFAOYAV
SMILES C=C(F)F
Properties
Chemical formula	C2H2F2
Molar mass	64.03 g·mol−1
Appearance	Colorless gas
Odor	Slightly ethereal
Density	2.89 kg/m3 (vapor, 0 °C) 1.122 g/mL (liquid, -84 °C)
Melting point	−144 °C (−227 °F; 129 K)
Boiling point	−84 °C (−119 °F; 189 K)
Solubility in water	0.254 g/L
Vapor pressure	35.2 atm (20°C)
Hazards
Main hazards	Flammable
Autoignition temperature	380 °C (716 °F; 653 K)
Explosive limits	5.5%-21.3%
US health exposure limits (NIOSH):
PEL (Permissible)	none
REL (Recommended)	TWA 1 ppm C 5 ppm
IDLH (Immediate danger)	N.D.
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

1,1-Difluoroethylene is a hydrofluoroolefin. Global production in 1999 was approximately 33,000 metric tons. It is primarily used in the production of fluoropolymers such as polyvinylidene fluoride.