ISO INTERNATIONAL STANDARD 10629 First edition 1996-07-01 ANsl Iriternat Doc Sec Raw optical glass - Resistance to attack by aqueous alkaline solutions at 50 °C - Test method and classification Verre d'optique brut -- Resistance a I'attaque par des solutions aqueuses alcalines a 50 C - Methode d'essai et classification ISO Reference number ISO10629:1996(E) No reproduction or networking permitted without license from IHS Not for Resale IS010629:1996(E) Foreword IsO (the International Organization for Standardization) is a worldwide fed- eration of national standards bodies (ISO member bodies). The work of preparing Internationai Standards is normally carried out through IsO which a technical committee has been established has the right to be rep- non-governmental, in liaison with IsO, also take part in the work. IsO col laborates closely with the International Electrotechnical Commission (lEC) onallmattersofelectrotechnicalstandardization Draft Internationai Standards adopted by the technical committees are cir- culated to the member bodies for voting. Publication as an International avote ISO/TC 172, Optics and optical instruments, Subcommittee SC 3. Optical materialsandcomponents Annex A of this International Standard is for information only @1SO1996 All rights reserved. Unless otherwise specified, no part of this publication may be repro- duced or utilized in any form or by any means. electronic or mechanical, including photo- copying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case Postale 56 . CH-1211 Geneve 20: Switzerland Printed in Switzerland i Copyright Intemational Organization for Standardization Not for Resale INTERNATIONAL STANDARD @ISO ISO 10629:1996(E) Raw optical glass - Resistance to attack by aqueous alkaline solutions at 50 °C - Test method and classification 1 Scope 3Principle This International Standard specifies a method for Attack on polished glass by a test solution (sodium testing the resistance of raw optical glasses to attack hydroxide 0,01 mol/l solution) at 50 C for specified times. Weighing to determine the loss in mass and cation of optical glasses according to the aqueous calculation of depth of attack based on the density of alkaline resistance (alkali resistance) determined by the glass. Comparison of the time required for an ap- this method. parent attack to a depth of 0,1 μm with time scales given in a classification table to obtain the alkali resis- tance class This International Standard is applicable to samples of raw optical giasses. 4 Reagents NOTE 1 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. 2 Normative references 4.1 Water, complying with the grade 2 requirements ofISO3696 The following standards contain provisions which through reference in this text, constitute provisions of this International Standard. At the time of publication. 4.2 Test solution. the editions indicated werevalid.All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to in- Sodium hydroxide solution of concentration c(NaOH) = 0,01 mol/lI obtained by dituting the sodium vestigate the possibility of applying the most recent hydroxide solution (4.4) with water. Prepare a carbon- editions of the standards indicated below. Members ate-free solution. Control the pH-value and adjust, if of IEC and ISO maintain registers of currently valid In- necessary, to pH 12. ternational Standards. ISO 2768-1:1989. General tolerances -- Part 1: Toler- 4.3 Nitric acid (HNO3), analytical grade. ances for linear and angular dimensions without indi- vidual tolerance indications. Dilute to pH 4,5 ± 0,1. ISO 3585:1991, Borosilicate glass 3.3 --- Properties. ISO 3696: 1987. Water for analytical laboratory use 4.4 Sodium hydroxide solution, Specification and test methods. c(NaOH) ~ 0,1 mol/l. 1 national