BS IS020251:2016 BSl Standards Publication Textile floor coverings - Water impermeability test bsi. BS ISO 20251:2016 BRITISH STANDARD National foreword This British Standard is the UK implementation of IS0 20251:2016 BSl, as a member of CEN, is obliged to publish EN 20251 as a British Standard.However,attentionisdrawntothefactthatduringthe development of this European Standard, the UK committee voted against its approval. Despite the original test being developed in the UK and a previous agreement to change the test liquid to Lissamine Red, the standard hasbeenpublishedusingMethyleneBlue.TheUkcommitteetrialed both test liquids and found that Methylene Blue gives anomalous results; passing material that is potentially permeable. Lissamine Red doesnothavethisproblem. The UK committee also disagree with the scope allowing for the testing of carpet tiles, as they are not going to be impermeable where they join. The UK participation in its preparation was entrusted to Technical Committee PRI/3, Textile floor coverings. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. @The British Standards Institution2017.Published by BSI Standards Limited2017 ISBN 978 0 580 88336 1 ICS97.150 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2017. Amendments/corrigenda issued since publication Date Text affected BS ISO 20251:2016 INTERNATIONAL ISO STANDARD 20251 First edition 2016-12-15 Textile floor coverings Water impermeability test Revetements de sol textiles - Essai d'imperméabilité a I'eau Reference number IS0 20251:2016(E) ISO @IS02016