ISO INTERNATIONAL STANDARD 21546 First edition 2019-02 Paints and varnishes Determination of the resistance to rubbing using a linear abrasion tester (crockmeter) Peintures et vernis-Determinationdela résistancea larayureavec unabrasimetrelinéaire Referencenumber IS0 21546:2019(E) so @IS0 2019 IS021546:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ISO2019 All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below orIso's memberbody in the countryof therequester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone:+41227490111 Fax:+4122749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019- All rights reserved IS021546:2019(E) Contents Page Foreword ..iv 1 Scope. ..1 2 Normativereferences 3 Terms and definitions 4 Principle .2 5 Apparatus and ancillary materials .2 5.1 Linearabrasiontester (crockmeter) .2 5.2 Abrasiontool .3 5.3 Feltcloth. 5.4 Abrasive material, for lining the abrasion tool .7 5.5 Abrasive medium 7 5.6 Toolsfor assessingthefrictionmarks 7 6 Test specimens. > 6.1 Test specimens 7 6.2 Filmthickness .7 6.3 Conditioning .8 7 Procedure .8 7.1 Test conditions subjectto agreement .8 7.2 Test environment .8 7.3 Testing process .8 8 Evaluation ..9 9 Precision ..9 9.1 Repeatability limit, r .9 9.2 Reproducibility limit, R .9 10 Test report .10 AnnexA (informative)Usualtestconditions ..11 Annex B (informative) Measuring template .12 Annex C (informative)Evaluation ofgloss as test criterion ..13 AnnexD (informative)Details onprecision ..14 Bibliography .18 @ IS0 2019 -All rights reserved iii