SIST EN ISO 3231:1998

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Beschichtungsstoffe - Bestimmung der Beständigkeit gegen feuchte, Schwefeldioxid enthaltende Atmosphären (ISO 3231:1993)Peintures et vernis - Détermination de la résistance aux atmospheres humides contenant du dioxyde de soufre (ISO 3231:1993)Paints and varnishes - Determination of resistance to humid atmospheres containing sulfur dioxide (ISO 3231:1993)87.040Barve in lakiPaints and varnishesICS:Ta slovenski standard je istoveten z:EN ISO 3231:1997SIST EN ISO 3231:1998en01-januar-1998SIST EN ISO 3231:1998SLOVENSKI
STANDARD



SIST EN ISO 3231:1998



SIST EN ISO 3231:1998



SIST EN ISO 3231:1998



SIST EN ISO 3231:1998



SIST EN ISO 3231:1998



INTERNATIONAL STANDARD IS0 3231 Second edition 1993-01-15 Paints and varnishes - Determination of resistance to humid atmospheres containing sulfur dioxide Pein tures et vernis - Dktermination de la ksistance aux atmosphkes humides contenant du dioxyde de soufre Reference number IS0 3231 :I 993(E) SIST EN ISO 3231:1998



IS0 3231:1993(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 body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. IS0 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 International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 3231 was prepared by Technical Committee lSO/TC 35, Paints and varnishes, Sub-Committee SC 9, General test methods for paints and varnishes. This second edition cancels and replaces the first edition (IS0 3231:1974), of which it constitutes an editorial and minor technical revision. Annex A forms an integral part of this International Standard. 0 IS0 1993 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without per- mission in writing from the publisher. International Organization for Standardization Case Postale 56 l CH-1211 Geneve 20 l Switzerland Printed in Switzerland SIST EN ISO 3231:1998



INTERNATIONAL STANDARD IS0 3231:1993(E) Paints and varnishes - Determination of resistance to humid atmospheres containing sulfur dioxide 1 Scope This International Standard is one of a series of stan- dards dealing with the testing of paints, varnishes and related products. This International Standard specifies a procedure for determining the resistance of a single-coat film or a multi-coat system of paints or related products to humid atmospheres containing sulfur dioxide. The test method allows for different amounts of sulfur dioxide; a volume of 0,2 litre, measured at atmos- pheric pressure, is generally recommended for testing coatings of thickness not exceeding approximately 40 j.4m. IS0 4628-2:1982, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of in- tensity, quantity and size of common types of defect - Part 2: Designation of degree of blistering. IS0 4628-3: 1982, Paints and varnishes - Evaluation of degradation of paint coatings - Designation of in- tensity, quantity and size of common types of defect - Part 3: Designation of degree of rusting. 3 Principle A coated test panel is exposed to specified humid at- mospheres containing sulfur dioxide and the effects of exposure are evaluated by criteria agreed in ad- vance between the interested parties, these criteria usually being of a subjective nature. 2 Normative references 4 Required supplementary information The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid International Standards. IS0 1512: 1991, Paints and varnishes - Sampling of products in liquid or paste form. IS0 1513:1992, Paints and varnishes - Examination and preparation of samples for testing. IS0 1514:1984, Paints and varnishes - Standard panels for testing. IS0 2808:1991, Paints and varnishes - Determi- nation of film thickness. I SO 3696: 1987, Water for analytical laboratory use - Specification and test methods. For any particular application, the test method speci- fied in this International Standard needs to be com- pleted by supplementary information. The items of supplementary information are given in annex A. 5 Reagent 5.1. Sulfur dioxide, either supplied from a gas cyl- inder or gas-generating device fitted with appropriate regulating and measuring apparatus to ensure the supply of the correct volume of gas, or generated within the cabinet, for example by mixing analytical- grade sodium sulfite, Na,SO,, with an excess of analytical-grade sulfuric acid (p = I,84 g/ml). NOTE 1 To obtain 0,2 (or 1 ,O> litre of sulfur dioxide, use (1 + 0,025) g [or (5,25 + 0,12) g] of sodium sulfite and at least 0,9 g (or 4,2 g) of sulfuric acid. It is recommended to dissolve the sodium sulfite in 50 ml of water of at least grade 3 as specified in IS0 3696, to dilute the sulfuric acid I:1 by adding it to the water, to place both reagents in the cabinet, to shut the door or hood and to add the diluted sulfuric acid to the sodium sulfite solution with the aid of a tilting device. 1 SIST EN ISO 3231:1998



IS0 3231:1993(E) 6 Apparatus 6.1 Airtight cabinet, of capacity (300 + 10) litre, in the base of which is a watertight trough, of suitable capacity (see 9.1 .l ), fitted with a means of heating the water to meet the requirements of 9.3. The dimensions and design of the airtight cabinet are not critical, provided the requirements of 6.2 are met. It shall be constructed of an inert material and have a roof which prevents condensed water from dripping on to the test panels. The airtight cabinet shall be provided with a means of relieving excess pressure, and a gas inlet pipe shall be situated immediately above the water surface. The airtight cabinet shall also be provided with a means of controlling the temperature, which shall be measured in the space above the test panels. NOTE 2 The apparatus may also be fitted with a door or a removable hood. Suitable designs of apparatus are shown in figures 1 and 2. 6.2 Stand for test panels, made of, or coated with, an inert material. The test panels shall be arranged vertically so that they are at least 100 mm from any wall or cover and at least 20 mm from each other, and so that the lower edges of the panels are at least 200 mm above the water. If possible, the test panels shall be arranged at the same level for comparative tests; if this is not possible, care shall be taken to ensure that water that has condense
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