ISO INTERNATIONAL STANDARD 17221 First edition 2014-05-01 Plastics Determination of image clarity (degree of sharpness of reflected or transmitted image) Plastiques - Détermination de la clarté de I'image (degré de netteté de Il'image refléchie ou transmise) Reference number IS0 17221:2014(E) TSO IS02014 HS under ted without license from IHS Not for Resale IS0 17221:2014(E) COPYRIGHTPROTECTEDDOCUMENT @ IS0 2014 All rights reserved. Unless otherwise specified, 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 or ISO's member body in the country of the requester. ISO copyright office Case postale 56:CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2014 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 17221:2014(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. ..1 2 Normative references 3 Terms and definitions 4 Principle ..1 5 Instrument. ..1 6 Test specimen 7 Procedure ..4 7.1 Zero adjustment. 7.2 Sensitivity adjustment ..5 7.3 Measurement on the test specimen ..5 8 Calculation ..5 9 Test report ..6 Annex A (informative) Example of determination Annex B (informative) Precision ..10 Bibliography .12 Copyrhtnteatonal Onaadiza rights reserved iii d by IHS under lic ense with ISt ed without license from IHS Not for Resale