1、BRITISH STANDARD BS EN ISO 3231:1998 BS3900-F8: 1993 Incorporating Amendment No.1 to BS3900-F8:1993 (renumbers the BS as BS EN ISO 3231:1998) Paints and varnishes Determination of resistance to humid atmospheres containing sulfur dioxide The European Standard EN ISO3231:1997 has the status of a Brit
2、ish Standard ICS87.040BSENISO3231:1998 This British Standard, having been prepared under the directionof the Pigments, Paintsand Varnishes StandardsPolicy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15May1993 BSI05-1999 First published1976 Second edition
3、 May1993 The following BSI references relate to the work on this standard: Committee reference PVC/10 Draft for comment91/57109DC ISBN 0 580 21770 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Pigments, Paints and Varnishes Standards
4、 Policy Committee (PVC/-) to Technical Committee PVC/10, upon which the following bodies were represented: European Resin Manufacturers Association Health and Safety Executive Institute of Metal Finishing Ministry of Defence National Centre of Tribology Oil and Colour Chemists Association Paint Rese
5、arch Association Paintmakers Association of Great Britain Ltd. Titanium Pigment Manufacturers Technical Committee Amendments issued since publication Amd. No. Date Comments 9930 March 1998 March 1998 Indicated by a sideline in the marginBSENISO3231:1998 BSI 05-1999 i Contents Page Committees respons
6、ible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Required supplementary information 3 5 Reagent 3 6 Apparatus 3 7 Sampling 4 8 Test panels 4 9 Procedure 4 10 Precision 5 11 Test report 5 Annex A (normative) Required supplementary information
7、8 Annex ZA (normative) Normative references to international publications with their relevant European Publications 8 Figure 1 Airtight cabinet with door 6 Figure 2 Airtight cabinet with hood 7 List of references Inside back coverBSENISO3231:1998 ii BSI 05-1999 National foreword This standard has be
8、en prepared by Technical Committee STI/10. It is the English language version of EN ISO3231:1997 Paints and varnishes Determination of resistance to humid atmospheres containing sulfur dioxide published by the European Committee for Standardization (CEN). It is identical with ISO3231:1993 published
9、by the International Organization for Standardization (ISO). This edition supersedes BS3900-F8:1976 which is withdrawn. The difference between BS3900-F8:1976 and this standard is that a method to generate the required quantities of sulfur dioxide is now described. Cross-references A British Standard
10、 does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. International standard Corresponding British Standard BS390
11、0 Methods of test for paints ISO1512:1991 Part A1:1992 Sampling (Identical) ISO1513:1992 Part A2:1993 Examination and preparation of samples for testing (Identical) ISO1514:1984 Part A3:1986 Standard panels for paint testing (Identical) ISO2808:1991 Part C5:1992 Determination of film thickness (Iden
12、tical) ISO3696:1987 BS3978:1987 Specification for water for laboratory use (Identical) ISO4628-2:1982 BS3900 Methods of test for paints Part H2:1983 Designation of degree of blistering (Identical) ISO4628-3:1982 Part H3:1983 Designation of degree of rusting (Identical) Summary of pages This document
13、 comprises a front cover, an inside front cover, pagesi andii, theEN ISOtitle page, pages2 to8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover
14、.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO3231 November1997 ICS87.040 Descriptors: Paints, varnishes, tests, chemical tests, determination, chemical resistance, air, humidity, sulfur dioxide English version Paints and varnishes Determination of resistance to humid atmospheres containi
15、ng sulfur dioxide (ISO3231:1993) Peintures et vernis Dtermination de la rsistance aux atmospheres humides contenant du dioxyde de soufre (ISO3231:1993) Beschichtungsstoffe Bestimmung des Bestndigkeit gegen feuchte, Schwefeldioxid enthaltende Atmosphren (ISO3231:1993) This European Standard was appro
16、ved by CEN on30 October1997. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national s
17、tandards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified
18、 to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and Un
19、itedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref. No. EN ISO3
20、231:1997EENISO3231:1997 BSI 05-1999 2 Foreword The text of the International Standard from Technical Committee ISO/TC35, Paints and varnishes, of the International Organization for Standardization (ISO) has been taken over as a European Standard by Technical Committee CEN/TC139, Paints and varnishes
21、, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May1998, and conflicting national standards shall be withdrawn at the latest by May1998. According to CEN
22、/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,
23、 Switzerland and the UnitedKingdom. Endorsement notice The text of the International Standard ISO3231:1993 has been approved by CEN as a European Standard without any modification. NOTENormative references to International Standards are listed in Annex ZA (normative).ISO3231:1993(E) BSI 05-1999 3 1
24、Scope This International Standard is one of a series of standards 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 a
25、tmospheres containing sulfur dioxide. The test method allows for different amounts of sulfur dioxide; a volume of0,2litre, measured at atmospheric pressure, is generally recommended for testing coatings of thickness not exceeding approximately404m. 2 Normative references The following standards cont
26、ain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investiga
27、te the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO1512:1991, Paints and varnishes Sampling of products in liquid or paste form. ISO1513:1992, Paints and varnishes Examinat
28、ion and preparation of samples for testing. ISO1514:1984, Paints and varnishes Standard panels for testing. ISO2808:1991, Paints and varnishes Determination of film thickness. ISO3696:1987, Water for analytical laboratory use Specification and test methods. ISO4628-2:1982, Paints and varnishes Evalu
29、ation of degradation of paint coatings Designation of intensity, quantity and size of common types of defect Part2: Designation of degree of blistering. ISO4628-3:1982, Paints and varnishes Evaluation of degradation of paint coatings Designation of intensity, quantity and size of common types of def
30、ect Part3: Designation of degree of rusting. 3 Principle A coated test panel is exposed to specified humid atmospheres containing sulfur dioxide and the effects of exposure are evaluated by criteria agreed in advance between the interested parties, these criteria usually being of a subjective nature
31、. 4 Required supplementary information For any particular application, the test method specified in this International Standard needs to be completed by supplementary information. The items of supplementary information are given in Annex A. 5 Reagent 5.1 Sulfur dioxide, either supplied from a gas cy
32、linder 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 2 SO 3 , with an excess of analytical-grade sulfuric acid ( =1,84g/
33、ml). NOTE 1To obtain0,2 (or1,0) litre of sulfur dioxide, use(1 0,025)g or(5,25 0,12)g of sodium sulfite and atleast0,9g (or4,2g) of sulfuric acid. It is recommended to dissolve the sodium sulfite in50ml of water of at least grade3 as specified in ISO3696, to dilute the sulfuric acid1:1 by adding it
34、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. 6 Apparatus 6.1 Airtight cabinet, of capacity (300 10) litre, in the base of which is a watertight trough, of suitable c
35、apacity (see9.1.1), fitted with a means of heating the water to meet the requirements of9.3. The dimensions and design of the airtight cabinet are not critical, provided the requirements of6.2 are met. It shall be constructed of an inert material and have a roof which prevents condensed water from d
36、ripping 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 measure
37、d in the space above the test panels. NOTE 2The apparatus may also be fitted with a door or a removable hood. Suitable designs of apparatus are shown in Figure 1 and Figure 2. 6.2 Stand for test panels, made of, or coated with, an inert material. The test panels shall be arranged vertically so that
38、they are at least100mm from any wall or cover and at least20mm from each other, and so that the lower edges of the panels are at least200mm 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
39、that water that has condensed on upper panels does not drip on to the lower panels.ISO3231:1993(E) 4 BSI 05-1999 The stand shall be of sufficient size to accommodate test panels with a total surface area (all panels together) of0,5m 2(see also9.1.2). 6.3 Environmental cabinet (optional, see9.1), cap
40、able of being maintained at a temperature of(23 5)C and relative humidity of (50 20)%, also including a stand for test panels. 7 Sampling Take a representative sample of the product to be tested (or of each product in the case of a multi-coat system), as described in ISO1512. Examine and prepare eac
41、h sample for testing, as described in ISO1513. 8 Test panels 8.1 Materials and dimensions Unless otherwise specified or agreed, the test panels shall be of burnished steel complying with ISO1514, and of approximate dimensions150mm 100mm (0,75to1,25)mm. 8.2 Preparation and coating Unless otherwise sp
42、ecified, prepare each test panel in accordance with ISO1514 and then coat it by the specified method with the product or system under test. Unless otherwise specified, coat the back and edges of the panel with the product or system under test. 8.3 Drying and conditioning Dry (or stove) and age (if a
43、pplicable) each coated test panel for the specified time and under the specified conditions and, unless otherwise specified, condition them at a temperature of(23 2)C and a relative humidity of(50 5)% for at least16h, with free circulation of air and not exposed to direct sunlight. The test procedur
44、e shall then be carried out as soon as possible. 8.4 Thickness of coating Determine the thickness, in micrometres, of the dried coating by one of the procedures specified in ISO2808. 9 Procedure 9.1 Ambient conditions Either set up the airtight cabinet(6.1) in a room with a clean atmosphere and a te
45、mperature of(23 5)C and relative humidity of(50 20)%, or have available the environmental cabinet(6.3). Protect the apparatus from draughts and direct sunlight. 9.1.1 Filling the trough Fill the trough with(2 0,2)litres of water of at least grade3 purity as specified in ISO3696. Drain and renew the
46、water prior to each heating operation. 9.1.2 Arrangement of the test panels Arrange the test panels in the airtight cabinet as specified in6.2. As the same volume of sulfur dioxide is introduced at each test cycle, the total surface area of the test panels in the airtight cabinet is important and, f
47、or comparative tests, the total test panel area in the cabinet should preferably be the same. In cases of dispute or for critical tests, the total surface area of the test panels shall be(0,5 0,1)m 2 . For critical applications, the test panels in the airtight cabinet shall be restricted to the type
48、 undergoing evaluation for a particular purpose. NOTE 3Different types of film absorb sulfur dioxide at different rates and to different extents, so that the operation of the test may be affected by the types of test panel included in the airtight cabinet. For example, the inclusion of oil paints an
49、d matt paints containing reactive basic pigments will reduce the severity of the test for other panels. 9.2 Introduction of sulfur dioxide Close the airtight cabinet and introduce0,2litre or1,0litre of sulfur dioxide, measured at atmospheric pressure, as specified. NOTE 4By agreement, other amounts of sulfur dioxide may be used. 9.3 Test cycle After the introduction of the sulfur dioxide, switch on the heating appliance and raise the air temperature to(40 3)C, in not more than1,5h, and maintain this temperature for a total
