ISO INTERNATIONAL STANDARD 9689 First edition 1990-12-01 ANSI Internat Doc Sec Raw optical glass - Resistance to attack by aqueous alkaline phosphate-containing detergent solutions at 50 °c --- Testing and classification Verre d'optique brut --- Résistance a I'attaque par des solutions aqueuses de detergent contenant du phosphate alcalin a 50 'C -- Essai et classification Reference number ISO 9689:1990(E) No reproduction or networking permitted without license from IHS Not for Resale ISO 9689:1990(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-governmental, in liaison with isO,also take part inthe 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 inter- bodies casting a vote. International Standard iso 9689 was prepared by Technical Committee ISO/TC 172, Optics and optical instruments. It is based on a test method approved by the International Optical Glass Expert Group of Technical Committee 2 "Chemical durability and analy- sis" of the International Commission on Glass (ICG/TC 2) Annex A of this international Standard is for information only. 1SO1990 or by any means,electronic ormechanical,including photocopying and microfilm,without permission in writing from the publisher. InternatlonalOrganizationforStandardization CasePostale56.CH-1211Geneve20·Switzerland Printed in Switzerland ii Copyright Intern: Not for Resale ISO 9689:1990(E) INTERNATIONAL STANDARD Raw optical glass -- Resistance to attack by aqueous alkaline phosphate-containing detergent solutions at 50 'c Testing and classification 1 Scope 3 Principle ThisinternationalStandardspecifiesamethodfor Attackonpolishedglassbyanaqueoussolution testing the resistance of raw optical glasses to at- containing 0,01 mol/l tripolyphosphate at 50 °C for tack by aqueous alkaline phosphate-containing de- specified times. Weighing to determine the loss in tergent solutions (phosphate solutions) at 5o °C and mass and calculation of depth of attack based on the a classification of optical glasses according to the density of the glass. Comparison of the time re- aqueous alkaline phosphate-containing detergent quired for the apparent attack to a depth of 0,1 μm resistance (phosphate resistance) determined by with time scales given in a classification table to this method. obtain the phosphate resistance class. This International Standard is applicable to samples of raw optical glasses. Reagents NOTE1 The test method may also be used for other types of glasses. During the test, unless otherwise stated, use only reagents of recognized analytical grade. 4.1 Water, complying with the grade 2 require- ments of IsO 3696. 2 Normative references The following standards contain provisions which, 4.2 Phosphate solution. through reference in this text, constitute provisions ofthisinternationalStandard.Atthetimeofpubli- cation, the editions indicated were valid. All stan- 4.2.1 Purifying of commercially available dards are subject to revision, and parties to tripolyphosphate agreements based on this International Standard are encouraged to investigate the possibility of ap Prepare an aqueous solution containing plying the most recent editions of the standards in- 10 % (m/m) to 15 % (m/m) tripolyphosphate, filter dicated below. Members of iEC and IsO maintain out any insolubie matter and add ethanol (4.5) registers of currently valid International Standards. gradually, until one volume of