EN IS0 21135 EUROPEANSTANDARD NORME EUROPEENNE EUROPAISCHE NORM May 2024 ICS 59.140.30 English Version Chemicals for the leather tanning industry - Determination of the total content of certain bisphenols (IS0 21135:2024) Produits chimiques pour I'industrie du tannage du cuir Chemikalien fur die Gerbereindustrie - Bestimmung - Détermination de la teneur totale en certains des Gesamtgehalts von einzelnen Bisphenolen (ISO 21135:2024) bisphénols (IS0 21135:2024) This European Standard was approved by CEN on 15 May 2024. European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerningsuchnational standardsmaybeobtained onapplicationtotheCEN-CENELEC Management CentreortoanyCEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation undertheresponsibilityofa CENmemberintoitsownlanguageandnotifiedtotheCEN-CENELECManagement Centrehasthesamestatusastheofficialversions CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkiye and United Kingdom. cen EUROPEAN COMMITTEE FOR STANDARDIZATION COMITEEUROPEENDENORMALISATION EUROPAISCHESKOMITEEFURNORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels @2024CEN Ref. No. EN IS0 21135:2024 E worldwide for CEN national Members. EN IS0 21135:2024 (E) Contents Page European foreword... 2 EN IS0 21135:2024 (E) European foreword This document (EN IS0 21135:2024) has been prepared by Technical Committee IS0/IULTCS "International Union of Leather Technologists and Chemists Societies" in collaboration with Technical Committee CEN/TC 289 "Leather" the secretariat of which is held by UNI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by November 2024, and conflicting national standards shall be withdrawn at the latest by November 2024. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. Any feedback and questions on this document should be directed to the users' national standards body/national committee. A complete listing of these bodies can be found on the CEN website According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkiye and the United Kingdom. Endorsement notice The text of IS0 21135:2024 has been approved by CEN as EN IS0 21135:2024 without any modification. 3