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1、INTERNATIONAL STANDARD IS0 695 Third edition 1991-05-15 Glass - Resistance to attack by a boiling aqueous solution of mixed alkali - Method of test and classification Verre - Resistance ZI I attaque par une solution aqueuse bouillante d im mklange alcalin - MCthode d essai et classification Referenc
2、e number IS0 695:1991(E) IS0 695:1991(E) Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member b
3、ody 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 in the work. IS0 collaborates closely with the International Elect
4、rotechnical 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 castin
5、g a vote. International Standard IS0 695 was prepared by Technical Committee ISO/TC 48, Laboratory glassware and related apparatus. This third edition cancels and replaces the second edition (IS0 695:1984), of which it constitutes a technical revision. 0 IS0 1991 All rights reserved. No part of this
6、 publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission In writing from the publisher. International Organization for Standardization Case Postale 56 l CH-1211 Geneve 20 l Switzerland Printed In Switze
7、rland ii -,-,- INTERNATIONAL STANDARD IS0 695:1991 (E) Glass - Resistance to attack by a boiling aqueous solution of mixed alkali - Method of test and classification 1 Scope This International Standard specifies a) a method for determining the resistance of glass to attack by a boiling aqueous solut
8、ion of sodium carbonate and sodium hydroxide. The resistance is measured inversely by the loss in mass per unit surface area of the glass; b) a classification of glass according to the alkali resistance determined by the method of this International Standard. NOTE 1 The method of test according to t
9、his Inter- national Standard is also applicable for determining the alkali resistance of glass ceramics. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the ed
10、itions indicated were valid. All stan- dards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of ap- plying the most recent editions of the standards in- dicated below. Members of IEC and IS0 maintain registers of c
11、urrently valid International Standards. IS0 683-13:1986, Heat-treatable steels, alloy steels and free-cuffing steels - Part 13: Wrought stainless steels. IS0 719:1985, Glass - Hydrolyfic resistance of glass grains at 98 “C - Method of test and classification. IS0 720:1985, Glass - Hydrolytic resista
12、nce of glass grains at 121 “C - Method of tesf and classification. IS0 3696:1987, Wafer for analytical laboratory use - Specification and test methods. IS0 3819:1985, Laboratory glassware - Beakers. IS0 4799: 1978, Laboratory glassware - Condensers. 3 Principle 3.1 Immersion of two sample pieces, ea
13、ch having a total surface area of 10 cm* to 15 cm* in a boiling aqueous solution of equal volumes of sodium carbonate, c(Na,CO,) = 0,5 mol/l, and sodium hy- droxide c(NaOH) = 1 mol/l, for 3 h. Calculation of the loss in mass per unit surface area of the glass. 4 Reagents During the test, unless othe
14、rwise stated, use only reagents of recognized analytical grade and only distilled water or water of equivalent purity (grade 3 water complying with the requirements of IS0 3696). 4.1 Acetone, CH,COCH,. 4.2 4.3 4.4 Hydrochloric acid, solution, c(HCI) M 1 mol/l. Hydrochloric acid, solution, c(HCI) M 2
15、 mol/l. Hydrofluoric acid, c(HF) x 22 mol/l (i.e. w 400 g HF/I solution). 4.5 Sodium carbonate, solution, c(Na,CO,) = 0,5 mol/l ) 0,Ol mol/l, freshly prepared for each test. 4.6 Sodium hydroxide, solution, c(NaOH) = 1 mol/l + 0,02 mol/l, freshly prepared for each test. 5 Apparatus 5.1 Test vessel, o
16、f pure silver, alkali-resistant silver 1 -,-,- IS0 695:1991(E) alloy or stainless steel type 15 ) complying with the requirements of IS0 683-13. A recommended test vessel, as shown in figure 1, is cylindrical with a hemispherical or flat base and has a close-fitting lid. The lid has a wide neck and
17、is equipped on the internal surface with four hooks from which to sus- pend the sample pieces. A gasket, made of a ma- terial which remains inert under the test conditions, shall be used to form a seal between the lid and the body of the test vessel. 5.2 Condenser, of the Allihn or Liebig-West type,
18、 complying with the requirements of IS0 4799 and made of glass of hydrolytic resistance grain class HGA 1 of IS0 720*) fitted to the neck of the lid through a bung of suitable inert material which has previously been boiled for 60 min in water. 5.3 Balance, accurate to m, is the final mass, in milli
19、grams, of the sample; A is the total surface area, in square centi- metres, of the sample. Calculate the arithmetic mean of the values ob- tained. If the values differ by more than 10 % from the arithmetic mean, repeat the test, using two new samples and fresh solutions. 8.2 Classification Glass sha
20、ll be classified as shown in table 1, ac- cording to the loss in mass per total surface area, expressed in milligrams per square decimetre, when tested for 3 h by the method specified in this International Standard. Table 1 - Limit values in the alkali resistance test Loss in mass per total Class Ch
21、aracteristics surface area after 3 h mgldmg Al Low attack up to 75 A2 Slight attack Above 75 up to 175 A3 High attack Above 175 8.3 Designation For convenience of reference to the alkali resistance of glass complying with the classification of this International Standard, the use of the following de
22、s- ignation is recommended: Example: For a glass with a loss in mass per total surface area of 90 mg/dm2 (class A2): Glass, alkali resistance class IS0 695 - A2 8 Expression of results 9 Precision 8.1 Calculation From each of the results obtained, calculate and re- port the loss in mass per total su
23、rface area of each sample, pA,in milligrams per square decimetre, from the following numerical equation 1OOh - 1122) PA= A Repeatability value: Y = 16 mg/dm2 Reproducibility value: R = 25 mg/dm2 NOTE 2 The precision data are calculated from the re- sults obtained in an inter-laboratory test in which
24、 seven laboratories had carried out 87 single determinations re- sulting in an arithmetic mean of PA = 163 mg/dm* for the glass tested. 3 , IS0 695:1991(E) 10 Test report The test report shall include the following details: d) e) a) b) c) a reference to this International Standard; the loss in mass
25、per total surface area of the glass, in milligrams per square decimetre, to the nearest 1 mg/dm*, mean value; an identification of the sample; 9 alkali resistance class A (designation); a statement as to whether the test was applied to glass “as delivered” or to glass “as a material” after etching t
26、he surface; 9) any unusual features noted during the determi- nation. the total surface area, in square centimetres, of the sample tested, to the nearest 0,l cm*; IS0 695:1991(E) Dimensions in mlllimetres Gasket -fl - View of lid from above, showing position of hooks Other dimensions and specificati
27、ons as in the gauge figure Execution : - 4 hooks soldered to the lid; - 1 flange with ground fiat surface, fixed to the lid. Figure 1 - Examples of suitable test vessels with a hemispherical and a flat base 5 -,-,- IS0 695:1991(E) .,:, .,_ , - ., UDC 542.231:620.193.42 Descriptors: glass, alkali resistance, classification, designation, tests, alkali resistance tests, boiling temperature tests. Price based on 5 pages -,-,-
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