ISO INTERNATIONAL 11443 STANDARD Fourth edition 2021-02 Plastics Determination of the fluidity of plastics using capillary and slit-die rheometers Plastiques-Détermination de la fluidite au moyen de rheometres équipés d'une filiere capillaire ou plate Referencenumber ISO11443:2021(E) ISO @ IS0 2021 IS0 11443:2021(E) COPYRIGHTPROTECTEDDOCUMENT IS02021 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: +41 22 749 0111 Email: [email protected] Website:www.iso.org Published in Switzerland Coyrghthmaianderdzn @ IS0 2021 - All rights reserved IS011443:2021(E) Contents Page Foreword V Scope 1 .1 2 Normative references. .1 3 Terms and definitions .1 4 General principles 4 5 Apparatus. 4 5.1 Test device 4 5.1.1 General. 4 5.1.2 Rheometer barrel 5 5.1.3 Capillary dies (method A) 5 5.1.4 .9 Slit dies (method B) 5.1.5 Piston 9 5.2 Temperature control 9 5.3 Measurement of temperature and calibration 10 5.3.1 Testtemperature 10 5.3.2 Measurement oftesttemperature 10 5.3.3 Temperature calibration .10 5.4 Measurement of pressureand calibration .10 5.4.1 Test pressure 10 5.4.2 Pressure drop along the length of the slit die 11 5.4.3 Calibration 11 5.5 Measurementofthevolumeflowrateofthesample 11 6 Sampling. .11 7 Procedure .11 7.1 Cleaningthe test device 11 7.2 Selection of test temperatures. .12 7.3 Preparation of sampies. 13 7.4 Preheating 13 7.5 Determinationofthemaximumpermissibletestduration 13 7.6 Determination of test pressure at constant volume flow rate: Method 2 14 7.7 Determination ofvolumeflow rate at constanttest pressure: Method 1 14 7.8 Waitingperiods duringmeasurement 14 7.9 Measurement of extrudate swelling. 14 7.9.1 General. 14 7.9.2 Measurement at room temperature. 15 7.9.3 Measurement at the test temperature 15 Expression of results .15 8 8.1 Volume flow rate. 15 8.2 Apparentshearrate 16 8.2.1 General. 16 8.2.2 Method A: Capillary dies 16 8.2.3 Method B:Slitdies. 16 8.3 Apparentshear stress 17 8.3.1 General. 17 8.3.2 Method A: Capillary dies 17 8.3.3 Method B: Slit dies.. 17 8.4 True shear stress. 17 8.4.1 General. 17 8.4.2 Bagley correctionfor capillary dies (methodA) 18 8.4.3 Bagley correction for slit dies (method B) 21 8.4.4 Direct determination using slit dies (methodB) 22 8.5 True shear rate. 22 ii IS0 11443:2021(E) 8.5.1 General 22 8.5.2 Method A: Capillary dies .23 8.5.3 Method B: Slit dies. 23 8.6 Viscosity 23 8.7 Determination of extrudate swelling 23 8.7.1 Measurement atroomtemperature 23 8.7.2 Measurement at the test temperature 24 9 Precision 24 10 Testreport. 25 10.1 General 25 10.2 Test conditions .25 10.3 Flowcharacteristics 26 10.3.1 General. 26 10.3.2 Graphicalrepresentation 26 10.3.3Individual values 27 10.4 Visual examination. 27 AnnexA (informative)MethodofcorrectingfortheinfluenceofH/Bontheapparent shear rate.28 AnnexB(informative)Measurementerrors 30 AnnexC (informative)Uncertainties inthedeterminationofshearviscositybycapillary extrusion rheometrytesting .31 Bibliography 36 Copyright hendralVbgariabtoStandardzalon @ IS0 2021 - All rights reserved IS011443:2021(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (Iso member bodies). The work of preparing International Standards is normally carried out through Iso technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with Iso, also tak