BS IS0 4406:2021 BSl Standards Publication Hydraulic fluid power - Fluids Method for coding the level of contamination by solid particles bsi. BSISO4406:2021 BRITISH STANDARD Nationalforeword This British Standard is theUK implementation of IS04406:2021.It supersedes BS IS0 4406:2017, which is withdrawn The UKparticipation inits preparation was entrustedto Technical CommitteeMCE/18/-/6,Contaminationcontrol. A listoforganizationsrepresented onthis committee can be obtained on requesttoitscommitteemanager. This publication does not purportto include all the necessary provisions ofa contract.Users areresponsiblefor its correctapplication. @TheBritishStandards Institution2021 PublishedbyBSI Standards Limited 2021 ISBN 978 0 539 124132 ICS75.120;23.100.60 Compliance with aBritish Standard cannot conferimmunityfrom legal obligations. This British Standard was published under the authority of the Amendments/corrigendaissuedsincepublication Date Text affected BS IS0 4406:2021 ISO INTERNATIONAL STANDARD 4406 Fourth edition 2021-01 Hydraulic fluid power Fluids - Method for coding the level of contamination by solid particles Transmissionshydrauliques-Fluides-Méthodede codificationdu niveaudepollutionparticulairesolide Reference number IS0 4406:2021(E) ISO @IS0 2021