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Perfluorocyclobutane.svg Perfluorocyclobutane 3D.png
CAS number 115-25-3 YesY
ChemSpider 13846040 N
EC number 204-075-2
Jmol-3D images Image 1
Molecular formula C4F8
Molar mass 200.03 g/mol
Appearance colourless gas
Density 1.637 g/cm3 at −5.8 °C (liquid)

9.97 kg/m3 at −6 °C and 1 atm (gas)
8.82 kg/m3 15 °C and 1 atm (gas)

Melting point −40.1 °C (−40.2 °F; 233.1 K)
Boiling point −5.8 °C (21.6 °F; 267.3 K)
Solubility in water 0.016 vol/vol (1.013 bar and 20 °C)
Viscosity 109e-6 Poise (1.013 bar and 0 °C)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Octafluorocyclobutane, or perfluorocyclobutane, C4F8, is an organofluorine compound which enjoys several niche applications. It is related to cyclobutane by replacement of all C–H bonds with C–F bonds. Octafluorocyclobutane is produced by the dimerization of tetrafluoroethylene and the reductive coupling of 1,2-dichloro-1,1,2,2-tetrafluoroethane.[1]


In the production of semiconductor materials and devices, octafluorocyclobutane serves as a deposition gas and etchant.[2] It has also been investigated as a refrigerant in specialised applications, as a replacement for ozone depleting chlorofluorocarbon refrigerants. Exploiting its volatility and chemical inertness, octafluorocyclobutane may be found in some aerosolized foods. It is listed by the Codex Alimentarius under number 946 (E946 for EU). It is investigated as a possible replacement for sulfur hexafluoride as a dielectric gas.


  1. ^ Siegemund, G.; Schwertfeger, W.; Feiring, A.; Smart, B.; Behr, F.; Vogel, H.; McKusick, B. (2005), "Fluorine Compounds, Organic", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.a11_349 
  2. ^ "Octafluorocyclobutane (RC318)". Gas Encyclopaedia. Air Liquide. Retrieved May 15, 2013. 


Its critical point is at 115.3 °C and 2.79 MPa.