Octafluorocyclobutane

Octafluorocyclobutane is a propellant for foamed and sprayed food products.

Where it is and isn’t permitted

Status of Octafluorocyclobutane by jurisdiction. Every jurisdiction this site covers is listed, including those where the substance does not appear.
Jurisdiction	Status	Scope and limits	Citation
United StatesFood and Drug Administration	Permitted, with conditions		21 CFR 173.360retrieved 2026-09-07
Codex AlimentariusCodex Alimentarius Commission / JECFA	Not listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited.

What it is made from

Produced by fluorinating hydrocarbons.

Vegan
Vegetarian

InChIKey: BCCOBQSFUDVTJQ-UHFFFAOYSA-N
PubChem: CID 8263

Every name it appears under

27 recorded names. A label may use any of them.

E number

E946

CAS registry number

115-25-3
25510-99-0

As it appears in regulation

Octafluorocyclobutane

Other names

1,1,2,2,3,3,4,4-Octafluoro-Cyclobutane
1,1,2,2,3,3,4,4-Octafluorocyclobutane
1,1,2,2,3,3,4,4-Octafluorocyclobutane #
Cyclobutane, 1,1,2,2,3,3,4,4-octafluoro-
Cyclobutane, octafluoro-
Cyclooctafluorobutane
FKWC 318
FLON C 318
Fluorocarbon C-318
Freon 318
Freon C 318
Freon C-318
freon c318
FRON C 318
Halocarbon C-138
octafluoro-cyclobutane
Octafluorocyclobutane
Octafluorocyclobutane, or Refrigerant gas R C318
PERFLUOROCYCLOBUTANE
Perfluorocyclobutane (PFC C-318)
Perfluorocyclobutane; 99%"
Propellant C 318
Propellant C318

Hazard reference values

No reference value for this substance in the sources we hold.

Evidence and how bodies read it

Studies, and the differing conclusions regulators drew from them, are curated by hand rather than machine-read, and none has been written for this substance yet.

Sources for this page

ecfr retrieved 2026-09-07

Full licence terms and publisher details on Sources. How this page is built and updated: Method.

Machine-readable:/api/v1/additives/octafluorocyclobutane.json