ISO INTERNATIONAL STANDARD 1598 Second edition 1990-09-15 Plastics -- Cellulose acetate -- Determination of insolubleparticles Plastiques -- Acetate de cellulose -- Determination des particules insolubles Referencenumber ISO1598:1990(E) IS01598:1990(E) Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards bodies (IsO member bodies). The work of preparing Internationai Standards is normally carried out through Iso technical committees. Each member body interested in a subject for which a technicat committee has been established has the right to be mental 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Interna- tional Standard requires approval by at least 75 % of the member bodies casting a vote InternationalStandardisO1598waspreparedbyTechnicalCommittee ISO/TC 61, Plastics. This second edition cancels and replaces the first edition (Iso1598:1975),ofwhich itconstitutesaminor revision. ISO1990 All rights reserved. No part of thls publlcation may be reproduced or utillzed in any form or by anymeans,electronic or mechanlcal, including photocopying and microfilm,without permission in writing from the publisher. International Organization for Standardization Case Postale 56·CH-1211 Geneve 20·Switzeriand Printed tn Switzerland Coovriaht Internafional Oraanization for Standardization ISO 1598:1990(E) INTERNATIONAL STANDARD Plastics- Cellulose acetate --- Determination of insoluble particles WARNING --- The use of this International Standard may involve hazardous materials, operations and It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to.use. 1 Scope 3 Principle This International Standard specifies a method for Asolutionispreparedbyadditionofasolventtothe the determination of the number of visibfe particles celfulose acetate,and the visible,undissolved parti- (including allkinds of contamination and black dirt) cles in this solution, of a size equal to or larger than in cellulose acetate which are insoluble in a mixture a standard reference particle of specified size, are of dimethylphthalate, dichloromethane and meth- counted. anol, and are of size 0,15 mm or larger. This method is intended for cellulose acetate having Reagents an acetic acid yield above 50 % and containing no additives which affect the test results. During the determination, use only reagents. of re- cognized analytical grade, free from insotuble parti- cles. 4.1 Dichloromethane, d20 1,321 to 1,331, not less than 95 %(V/V) distilling between 39c and 2 Normative references 40,5Cat1013mbar(760mmHg). The following standards contain provisions which, SAFETY PRECAUTIONS Dichloromethane through reference inthis text, constitute provisions harmfulbyinhalation,Avoidcontactwiththeskin, of this International Standard. At the time of publi- cation, the editions indicated were valid. All stan- dards subject revision, and parties 4.2 are to to 64,5c to 65,5c at a pressure of 1013 mbar agreements,based on this International Standard are encouraged to investigate the possibility of ap- (760 mmHg). plying the most recent editions of the standards in- SAFETY PRECAUTIONS Methanol is highly dicated below. Members of IEc and Iso maintain flammable and toxic by inhalation or if swallowed registers of currently valid International Standards. Keep the container tightly closed and away from sources of ignition. Do not smoke. Avoid contact Iso 565:1990,Test sieves --Metal wire cloth,perfo- withthe skin. rated metal plate and electroformed sheet -- Nominal sizes of openings. 4.3Dimethylphthalate, d2 1,191 to,1,195, purity iso 5