ISO INTERNATIONAL STANDARD 21304-1 First edition 2019-03 Plastics Ultra-high-molecular- weight polyethylene (PE-UHMW) moulding and extrusion materials Part 1: Designation system and basis for specifications Plastiques - Matériaux a base de polyéthylene a tres haute masse moléculaire (PE-UHMW) pour moulage et extrusion Partie 1: Systeme de désignation et base de spécifications Reference number IS0 21304-1:2019(E) os1 @ IS0 2019 IS0 21304-1:2019(E) COPYRIGHTPROTECTEDDOCUMENT @ ISO 2019 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 or Iso's member body in the country of the requester. ISO copyright office CP 401 : Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Fax: +41 22 749 09 47 Email: copyright@iso.org Website: www.iso.org Published in Switzerland ii @ IS0 2019 - All rights reserved IS0 21304-1:2019(E) Contents Page Foreword ..iv 1 Scope 2 Normative references 3 Terms and definitions 4 Designation system .2 4.1 General 2 4.2 Data block 1 4.3 Data block 2 .3 4.4 Data block3 .3 4.5 Datablock4 4 4.5.1 General. ..4 4.5.2 Viscosity number 4 4.5.3 Elongational stress. 5 4.5.4 Charpy double-notched impact strength .5 4.6 Data block 5 .5 5 Examples of designations .6 5.1 Designation only. . 6 5.2 Designation transformed into a specification .7 Bibliography 8 @ IS0 2019 - All rights reserved iii