ISO INTERNATIONAL STANDARD 3001 Fourth edition 1999-02-15 Plastics Epoxy compounds - Determination of epoxy equivalent Plastiques - Compositions époxydiques - Détermination de I'équivalent époxy ISO Reference number ISO 3001:1999(E) by IHS under lic itted without license from IHS Not for Resale ISO 3001:1999(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 liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Thermosetting materials. This fourth edition cancels and replaces the third edition (IsO 3001:1997), which has been technically revised Annex A forms an integral part of this International Standard. @ISO1999 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic International OrganizationforStandardization Case postale 56 . CH-1211 Geneve 20 · Switzerland Internet [email protected] Printed in Switzerland ional Organization for Standardizatior INTERNATIONAL STANDARD @ ISO ISO 3001:1999(E) Plastics Epoxy compounds Determination of epoxy equivalent 1 Scope This International Standard specifies a method for the determination of the epoxy equivalent and is applicable to all 2 Definitions For the purposes of this International Standard, the following definitions apply. 2.1 epoxy equivalent the mass of resin, in grams, which contains one mole of epoxy groups 2.2 epoxy index the number of moles of epoxy groups contained in 1 kg of resin 3 Principle The epoxy groups in a test portion are reacted with nascent hydrogen bromide produced by the action of o,1 mol/l standard volumetric perchloric acid solution on tetraethylammonium bromide. The end-point is determined either using crystal violet as indicator or by a potentiometric method. 4 Reagents 4.1 Glacial acetic acid. 4.2 Acetic anhydride, purity > 96 %. 4.3 Chloroform. 4.4 Potassium hydrogen phthalate. 4.5 Crystal violet, indicator solution. Dissolve 100 mg of crystal violet in 100 ml of glacial acetic acid (4.1). 4.6 Perchloric acid, 0,1 mol/l standard volumetric solution. Copyright International Organizationfor Standardization se from IHS Not for Resale