BS IS0 4658:2020 BSl Standards Publication Acrylonitrile-butadiene rubber (NBR) Evaluation procedure bsi. BSISO4658:2020 BRITISH STANDARD National foreword This British Standard is the UK implementation of IS04658:2020.It supersedes BSIS04658:1999,which is withdrawn. The UKparticipationinits preparation was entrustedto Technical Committee PRI/50, Raw materials (including latex) for use in the rubber industry. A list oforganizations represented on this committee can be obtained on requestto its committee manager. This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct application. The British Standards Institution 2020 Published by BSI Standards Limited 2020 ISBN9780539033342 ICS 83.060 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the StandardsPolicy andStrategy Committeeon31August2020. Amendments/corrigendaissuedsincepublication Date Text affected BSISO4658:2020 ISO INTERNATIONAL STANDARD 4658 Fourth edition 2020-08 Acrylonitrile-butadiene rubber (NBR) - Evaluation procedure Caoutchouc acrylonitrile-butadiene (NBR)Methoded'évaluation Reference number IS0 4658:2020(E) ISO @IS02020