BS ISO 23900-4:2015 BSl Standards Publication Pigments and extenders - Methods of dispersion and assessment of dispersibility in plastics Part 4: Determination of colouristic properties and ease of dispersion of white pigments in polyethylene by two-roll milling bsi. ..making excellence a habit. BRITISH STANDARD BSISO23900-4:2015 National foreword This British Standard is the UK implementation of Is0 23900-4:2015. The UK participation in its preparation was entrusted to Technical Committee STI/1, Pigments. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. @ The British Standards Institution 2015.Published by BSI Standards Limited2015 ISBN9780580862649 ICS 87.060.10 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2015. Amendmentsissuedsincepublication Date Textaffected BS ISO 23900-4:2015 INTERNATIONAL ISO STANDARD 23900-4 First edition 2015-05-01 Pigments and extenders Methods of dispersion and assessment of dispersibility in plastics Part 4: Determination of colouristic properties and ease of dispersion of white pigments in polyethylene by two-roll milling Pigmentset matieres decharge-Méthodes de dispersion et évaluation de I'aptitudea la dispersion dans les plastiques- Partie 4: Détermination des propriétes colorimetriques et de la facilite de dispersion despigments blancsdans le polyethylene par calandrage surbicylindre Reference number IS0 23900-4:2015(E) TSO @ISO2015 BSISO23900-4:2015 IS023900-4:2015(E) Licensed copy:Imperial College, COPYRIGHTPROTECTEDDOCUMENT @IS02015 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 ormechanical, 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-1211Geneva20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland i @ IS0 2015 - All rights reserved BSISO23900-4:2015 IS023900-4:2015(E) Contents Page Foreword ..iv 1 Scope ..1 2 Normativereferences 3 Terms and definitions 4 Principle ..2 ..2 5 Materials 5.1 Polyethylene .2 5.2 Carbonblackpolyethylenemasterbatch .2 6 Apparatus ..2 7 Sampling .2 8 Procedure .2 8.1 Testing of colouristic properties in polyethylene in admixture with carbon black .2 8.1.1 Preparation ofthe mixture 2 8.1.2 Preparation of thetest sample 3 8.1.3 Pressing. .3 8.1.4 Photometricmeasurement .3 8.2 Testing of ease of dispersion. .3 8.2.1 Preparation ofthetestsamples .3 8.2.2 Pressing and photometric measurement .3 9 Evaluation ..3 10 Test report. 11 Precision ..4 IS02015-Allrights reserved ili BSISO23900-4:2015 IS023900-4:2015(E) Foreword Iso (the International Organization for Standardization) is a worldwidefederation 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 take part in the work. Iso collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its further maintenance are described in the ISo/IEc Directives, Part 1.In particular the different approval criteria needed for the different types of Iso d