Perfluorinated ion exchange membranes

CAS 31175-20-9

These fluorinated membranes are used in electrodialysis to separate and purify food liquids, chosen where an ordinary membrane would not survive the conditions.

Where it is and isn’t permitted

Status of Perfluorinated ion exchange membranes by jurisdiction. Every jurisdiction this site covers is listed, including those where the substance does not appear.
JurisdictionStatusScope and limitsCitation
United StatesFood and Drug AdministrationPermitted, with conditions21 CFR 173.21retrieved 2026-09-07
Codex AlimentariusCodex Alimentarius Commission / JECFANot listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited.

What it is made from

Made from a fluorinated polymer backbone carrying sulfonic acid groups.

  • Vegan
  • Vegetarian
CAS registry number
31175-20-9

Every name it appears under

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

CAS registry number

  • 31175-20-9

As it appears in regulation

  • Perfluorinated ion exchange membranes

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/perfluorinated-ion-exchange-membranes.json