ISO INTERNATIONAL STANDARD 1600 Second edition 1990-12-01 Plastics -- Cellulose acetate .- Determination of light absorption on moulded specimens produced using different periods of heating Plastiques -- Acetate de cellulose -- Determination de I'absorption de lumieresureprouvettesmouleesproduitesenutilisantdifferentes periodes de chauffage Reference number ISO1600:1990(E) Copyright International Organization for Standardizatior with ISC No reproduction or networking permitted without license from IHS Not for Resale ISO 1600:1990(E) Foreword Iso (the International Organization for Standardization) is a woridwide 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 which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmentat, in liaison with isO, also take part in the work.iso coilaborates closely with theInternational 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 Inter- national Standard requires approval by at least 75% of the member bodies casting a vote. International Standard IsO 1600 was prepared by Technical Committee ISO/TC 61, Plastics. This ssecond edition cancels and replaces the first edition ISO1990 or by any means, electronic or mechanical, including photocopying and microtim, without permissioninwriting fromthepubllsher. International OrganizationforStandardization Case Postale 56· CH-1211 Geneve 20 · Switzerland Printed in Switzerland Copyright International Organization for Standardization ii No reproduction or etworking permitted without license from IHS Not for Resale ISO 1600:1990(E) INTERNATIONAL STANDARD Plastics - Cellulose acetate -- Determination of light absorption on moulded specimens produced using different periods of heating WARNiNG --- The use of this International Standard may involve hazardous materials, operations and equipment.This standard does not purporttoaddressall of the safetyproblems associated withitsuse It is the responsibility of the user of this standard to establish appropriate safety and health practices and determinethe applicabilityofregulatorylimitationspriorto use, 1 Scope are encouraged to investigate the possibility of ap- plyingthemostrecent editions ofthe standards in- This International Standard specifies a method for dicated below. Members of IEC and ISO maintain thedeterminationof light absorptionof cellulose registers of currently valid International Standards. acetate, employing test specimens taken from two mouldings which have been produced using differ- Iso 565:1990, Test sieves -- Metal wire cloth, perfo- ent periods of heating. ratedmetalplateandelectroformedsheet--Nominal sizes of openings. Theaimistoprovidequantitativemeasurements which are compatible with visual judgements of IsO585:19901,Plastics Unplasticized cellulose yellowness andlightness,andofchangesinthese acetate--Determination ofmoisture content. properties after moulding. The determinations are carried out on cellulose acetate in plasticized form rather than in solution, since a more reliable guide 3 Principle is thereby obtained to the performance of cellulose acetate in plastics materials. The absorption of visible light by celfulose acetate Thismethod minimizes the effects of haze or is normally greatest at the blue end of the visible imperfections inthespecimens. spectrum,and decreasescontinuouslyacrossthe spectrum to the red end. Therefore two measure. This method is intended for cellulose acetate having mentsofabsorption,oneattheredendandoneat an acetic acid yield of 54 % ± 2,5 %.It may also be the blue end, are sufficient to characterize the ab- applicable to other t