Registers of Specific Exemptions for chemicals listed in Annex B

Article 4 of the Convention provides for the establishment of a Register for the purpose of identifying the Parties that have specific exemptions listed in Annex A or Annex B.

Please click on the chemical names listed below in the table to display respective registers. 

For information on how to register specific exemptions please click here.

List of registers for chemicals listed in Annex B

By decision SC-7/1 and decision SC-9/1, the Conference of the Parties noted that as there were no longer any Parties registered for the specific exemptions for the production and use of perfluorooctane sulfonic acid, its salts and perfluorooctane sulfonyl fluoride as adopted by decision SC-4/17, no new registrations may be made with respect to them.

By decision SC-9/4, the Conference of the Parties decided to amend Annex B with a new listing, including amended specific exemptions and acceptable purposes for perfluorooctane sulfonic acid, its salts and perfluorooctane sulfonyl fluoride, as reflected in the table below. These amendments will enter into force on 3 December 2020, on expiry of one year from the date of communication by the depositary of the adoption of the amendment, for all Parties that have not submitted a notification of non-acceptance according to paragraph 3 (b) of Article 22. For those Parties that made a declaration pursuant to paragraph 4 of Article 25, the amendment will enter into force on the ninetieth day after deposit of its instrument of ratification, acceptance, approval or accession.

The table below incorporates the amendments adopted by decision SC-9/12 in relation to PFOS, its salts and PFOSF in relation to specific exemptions - for information in relation to the acceptable purposes please see here.  

Specific exemptions
Perfluorooctane sulfonic acid (CAS No: 1763-23-1), its saltsa and perfluorooctane sulfonyl fluoride
(CAS No: 307-35-7)

  a For example:

potassium perfluorooctane sulfonate
(CAS no. 2795-39-3);

lithium perfluorooctane sulfonate
(CAS no. 29457-72-5);

ammonium perfluorooctane sulfonate
(CAS no. 29081-56-9);

diethanolammonium perfluorooctane sulfonate (CAS no. 70225-14-8);

tetraethylammonium perfluorooctane sulfonate (CAS no. 56773-42-3);

didecyldimethylammonium perfluorooctane sulfonate (CAS no. 251099-16-8).





  • Metal plating (hard-metal plating) only in closed-loop systems

  • Fire-fighting foam for liquid fuel vapour suppression and liquid fuel fires (Class B fires) in installed systems, including both mobile and fixed systems, in accordance with paragraph 10 of part III of Annex B