ISO INTERNATIONAL STANDARD 308 Third edition 1994-10-01 Plastics --- Phenolic moulding materials Determination of acetone-soluble matter (apparent resin content of material in the unmoulded state) Plastiques -- Matieres a mouler a base de phenoplastes Détermination des matieres solubles dans I'acétone (teneur apparente en résinedesmatieresa/'étatnonmoule) Iso Reference number ISO308:1994(E) Not for Resale ISO 308:1994(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 represented on that committee. International organizations, governmental coilaborates 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. Publication as an International a vote. ISO/TC 61, Plastics, Subcommittee SC 12., Thermosetting materials. This third edition cancels and replaces the second edition (IsO 308:1981), of which it constitutes a minor revision. ISO 1994 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 · CH-1211 Geneve 20 : Switzerland Printed in Switzerland by IHS under license with IS Not for Resale ISO 308:1994(E) INTERNATIONAL STANDARD ISO Plastics Phenolic moulding materials Determination of acetone-soluble matter (apparent resin content of material in the unmoulded state) Scope Definitions This International Standard specifies a gravimetric For the purposes of this International Standard, the method for the determination of the amount of matter definitions of moulding materials based on phenolic that can be extracted by acetone, at a temperature resins, novolak resins and resol resins given in near its boiling point, from a sample of finely divided ISO 472 and ISO 800 apply phenolic moulding material. The method applies only to moulding materials based upon novolak resins and 4 Principle not to those based upon resols, as the latter type of resin may not be completely soluble in acetone. The acetone-soluble matter is extracted, using hot acetone,from a finelydivided test portion.Theextract In this International Standard, the amount of acetone is dried under controlled conditions and weighed. soluble matter is reported as the apparent resin con- tentbecause,aithoughtheextractconsistsmainlyof phenolic resin and hexamine, other acetone-soluble 5 Reagent components such as lubricants and colorants or na- tural resins from the filer are normally also present 5.1 Acetone, pure. and will therefore be reported as resin. 6 Apparatus 6.1 Reduction device, for reducing coarse materials to a finer state of division. 2Normative references 6.2 Balance, accurate to 1 mg. The following standards contain provisions which, throughreferenceinthistext,constituteprovisions 6.3 Extraction apparatus, of the type shown in of this International Standard., At the time of publi- figure 1. (A glass filter crucible may be used instead cation, the editions indicated were valid. All standards of a single-thickness extraction thimble.) are subject to revision, and parties to agreements based on this International Standard are encouraged The single-thickness extraction thimble, which shall to investigate the possibility of applying the most re- be free from acetone-soluble matter, together with a cent editions of the standards indicated below. looseplugofcottonwool,ifused,whichshallalsobe Members of IEC and ISO maintain registers of cur- freefromacetone-solublematter,shallbedriedfor rently valid International Standards. 2 h in the oven (6.4) at approximately 105 °C and stored in the desiccator