ISO INTERNATIONAL STANDARD 20568-2 First edition 2017-05 Plastics Fluoropolymer dispersions and moulding and extrusion materials Part 2: Preparation of test specimens and determination of properties Plastiques Polymeres fluoreés: dispersions et matériaux pour moulage et extrusion Partie 2: Préparation des éprouvettes et deétermination des propriétés Reference number IS0 20568-2:2017(E) International Organization for Standardization @ IS0 2017 HEJIANG INST OF STANDARDIZATION C1 5956617 ed without license from IHS IS0 20568-2:2017(E) COPYRIGHTPROTECTEDDOCUMENT IS0 2017, Published in Switzerland 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 Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org Licensee-ZHEJIANG INST OF STANDARDIZAISQ 017 - All rights reserVed Not for Resale, 2017/8/21 02:18:16 networking permited without license from IHS IS0 20568-2:2017(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references ..1 3 Terms and definitions 4 Preparation of test specimens. ..2 5 Conditioning and test conditions ..2 6 Determination of properties .2 7 Testing of PTFE. 7.1 Testing of polytetrafluoroethylene (PTFE) granular moulding and ram extrusion materials, and for PTFE resin produced from coagulation of dispersion .2 7.1.1 Standard specific gravity (SSG) .2 7.1.2 Bulk density .4 7.1.3 Particle size and size distribution .8 7.2 Testing of polytetrafluoroethylene (PTFE) dispersion ..15 7.2.1 Preparation of test samples.. 15 7.2.2 Percentage PTFE and surfactant in aqueous dispersion .15 8 Testing of melt processable fluoropolymers .16 8.1 Testing of CPT, ECTFE, EFEP, ETFE, FEP, PFA, PVDE, PVE, VDF/CTFE, VDF/HFP, VDF/TFE,VDF/TFE/HFP ..16 8.1.1 Melting-peak temperature ..16 8.1.2 Melt mass-flow rate (MFR) .16 8.2 Testing of PCTFE. 18 8.2.1 Zero-strength time .18 8.3 Testing of TFE/PDD 18 8.3.1Glass transition temperature .18 8.4 Testing of melt processable fluoropolymers dispersion ..19 Bibliography .20 ii icenSee=ZHEJIANG INST OF STANDARDIZATION C1 5956617 vithout license from IHS