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Octafluoropropane



Octafluoropropane
General
Systematic name Octafluoropropane
Other names Freon 218
Perfluoropropane
RC 218, PFC 218
R218
genetron 218
Molecular formula C3F8
SMILES FC(F)(F)C(F)(F)C(F)(F)F
Molar mass 188.02 g/mol
Appearance Colorless gas with
faintly sweet odor
CAS number 76-19-7
Properties
Density and phase 8.17 g/l, gas
Solubility in water  ? g/100 ml (? °C)
Melting point -183 °C (90.15 K)
Boiling point -36.7 °C (236.45 K)
Structure
Dipole moment 0.014 D
Hazards
MSDS External MSDS
Main hazards Suffocation
NFPA 704
0
1
0
 
Flash point N/A
R/S statement R: ?
S: ?
RTECS number TZ5255000
Supplementary data page
Structure and
properties
n, εr, etc.
Thermodynamic
data
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Related compounds
Related halocarbons Tetrafluoromethane
Hexafluoroethane
Related compounds Propane
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

Octafluoropropane (C3F8) is a non-flammable greenhouse gas that is produced as a by-product of circuit board production. It has featured in some plans for terraforming Mars.

Additional recommended knowledge

Contents

Applications

In the electronics industry, octafluoropropane is mixed with oxygen and used as an etching material for SiO2 layers in semiconductor applications, as oxides are selectively etched versus their metal substrates.

In medicine, octafluoropropane may compose the gas cores of microbubble contrast agents used in contrast-enhanced ultrasound. Octafluoropropane microbubbles reflects sound waves well and are used to improve the ultrasound signal backscatter.

Under the name R-218, octafluoropropane is used in other industries as a component of refrigeration mixtures.

Liquid phase

  • Liquid density (1.013 bar at boiling point) : 1601 kg/m³
  • Liquid/gas equivalent (1.013 bar and 15 °C (59 °F)) : 196 vol/vol
  • Latent heat of vaporization (1.013 bar at boiling point) : 104.25 kJ/kg

Gaseous phase

  • Gas density (1.013 bar at boiling point) : 10.3 kg/m³
  • Gas density (1.013 bar and 15 °C (59 °F)) : 8.17 kg/m³
  • Compressibility Factor (Z) (1.013 bar and 15 °C (59 °F)) : 0.975
  • Specific gravity (air = 1) (1.013 bar and 21 °C (70 °F)) : 6.683
  • Specific volume (1.013 bar and 21 °C (70 °F)) : 0.125 m³/kg
  • Viscosity (1.013 bar and 0 °C (32 °F)) : 0.000125 Poise
  • Thermal conductivity (1.013 bar and 0 °C (32 °F)) : 12.728 mW/(m·K)
  • Thermal Conductivity, Gas @ 101.325 kPa and 25 °C: 13.8 mW/(m·K)
  • Vapour Pressure @ 21.1 °C: 792 kPa

Major hazards

  • Non-toxic
  • Ozone Depletion Potential (ODP): 0.000
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Octafluoropropane". A list of authors is available in Wikipedia.
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