1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ICS 87.040 ISBN 0-626-15353-0 SANS 6270-1:2004 Edition 1 ISO 6270-1:1998 Edition 1 SOUTH AFRICAN NATIONAL STANDARD Paints and varnishes Determination of
4、resistance to humidity Part 1: Continuous condensation This national standard is the identical implementation of ISO 6270-1:1998 and is adopted with the permission of the International Organization for Standardization. Published by Standards South Africa 1 dr lategan road groenkloof ! private bag x1
5、91 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa 2004 SANS 6270-1:2004 Edition 1 ISO 6270-1:1998 Edition 1 Table of changes Change No. Date Scope Abstract Specifies a method for determining the resistance of paint films, paint sy
6、stems and related products to conditions of high humidity in accordance with the requirements of coating or product specifications. The method is applicable to coatings both on porous substrates such as wood, plaster plasterboard and on non-porous substrates such as metal. It provides an indication
7、of the performance likely to be obtained under severe conditions of exposure where continuous condensation occurs on the surface. The procedure may reveal failures of the coating (including blistering, staining, softening, wrinkling and embrittlement) and deterioration of the substrate. Keywords coa
8、ting materials, coatings, colour, condensation, humidity, moisture, paints, resistance, sampling, sampling methods, steam, test equipment, testing, tests, vapour resistance, varnishes, water-vapour tests. National foreword This South African standard was approved by National Committee StanSA SC 5140
9、.11I, Paints and varnishes Test methods, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This standard cancels and replaces SANS 5157 (SABS SM 157:1975). AReference numberISO 6270-1:1998(E)INTERNATIONALSTANDARDISO6270-1First edition1998-0
10、4-01Paints and varnishes Determination ofresistance to humidity Part 1:Continuous condensationPeintures et vernis Dtermination de la rsistance lhumidit Partie 1: Condensation continueISO 6270-1:1998(E) ISO 1998All rights reserved. Unless otherwise specified, no part of this publication may be reprod
11、ucedor utilized in any form or by any means, electronic or mechanical, including photocopying andmicrofilm, without permission in writing from the publisher.International Organization for StandardizationCase postale 56 CH-1211 Genve 20 SwitzerlandInternet centraliso.chX.400 c=ch; a=400net; p=iso; o=
12、isocs; s=centralPrinted in SwitzerlandiiContents Page1 Scope . 12 Normative references. 13 Principle 24 Required supplementary information . 25 Apparatus. 26 Sampling 27 Test panels. 38 Method of exposure of test panels. 39 Examination of test panels . 310 Precision 411 Test report 4Annex A (normati
13、ve) Required supplementary information 5 ISO ISO 6270-1:1998(E)iiiForewordISO (the International Organization for Standardization) is a worldwidefederation of national standards bodies (ISO member bodies). The work ofpreparing International Standards is normally carried out through ISOtechnical comm
14、ittees. Each member body interested in a subject for whicha technical committee has been established has the right to be representedon that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISOcollaborates closely with the Int
15、ernational Electrotechnical Commission(IEC) on all matters of electrotechnical standardization.Draft International Standards adopted by the technical committees arecirculated to the member bodies for voting. Publication as an InternationalStandard requires approval by at least 75 % of the member bod
16、ies castinga vote.International Standard ISO 6270-1 was prepared by Technical CommitteeISO/TC 35, Paints and varnishes, Subcommittee 9, General test methodsfor paints and varnishes.It cancels and replaces ISO 6270:1980, of which it constitutes a minortechnical revision.It differs from ISO 6270:1980
17、in that the angle of the panels to thehorizontal has been changed from (15 5) to (60 5) and thetemperature of the air below the panels is maintained at (38 2) C ratherthan at that of the water itself. Work has shown that the results do not differsubstantially between the two sets of conditions.At th
18、e date of publication, ISO 6270 consisted of only one part, under thegeneral title Paints and varnishes Determination of resistance tohumidity: Part 1: Continuous condensationOther parts will be added at a later date. One of these parts will beISO 11503:1995, Paints and varnishes Determination of re
19、sistance tohumidity (intermittent condensation), which will be renumbered into thisseries.Annex A forms an integral part of this part of ISO 6270.INTERNATIONAL STANDARD ISO ISO 6270-1:1998(E)1Paints and varnishes Determination of resistance to humidity Part 1:Continuous condensation1 ScopeThis part
20、of ISO 6270 is one of a series of standards dealing with the sampling and testing of paints, varnishes andrelated products.It specifies a method for determining the resistance of paint films, paints systems and related products to conditionsof high humidity in accordance with the requirements of coa
21、ting or product specifications.The method is applicable to coatings both on porous substrates such as wood, plaster and plasterboard and onnon-porous substrates such as metal. It provides an indication of the performance likely to be obtained undersevere conditions of exposure where continuous conde
22、nsation occurs on the surface.The procedure may reveal failures of the coating (including blistering, staining, softening, wrinkling andembrittlement) and deterioration of the substrate.2 Normative referencesThe following standards contain provisions which, through reference in this text, constitute
23、 provisions of this part ofISO 6270. At the time of publication, the editions indicated were valid. All standards are subject to revision, andparties to agreements based on this part of ISO 6270 are encouraged to investigate the possibility of applying themost recent editions of the standards indica
24、ted below. Members of IEC and ISO maintain registers of currently validInternational Standards.ISO 1512:1991, Paints and varnishes Sampling of products in liquid or paste form.ISO 1513:1992, Paints and varnishes Examination and preparation of samples for testing.ISO 1514:1993, Paints and varnishes S
25、tandard panels for testing.ISO 2808:1997, Paints and varnishes Determination of film thickness.ISO 3270:1984, Paints and varnishes and their raw materials Temperatures and humidities for conditioning andtesting.ISO 3696:1987, Water for analytical laboratory use Specification and test methods.ISO 462
26、8-1:1982, Paints and varnishes Evaluation of degradation of paint coatings Designation of intensity,quantity and size of common types of defect Part 1: General principles and rating schemes.ISO 4628-2:1982, Paints and varnishes Evaluation of degradation of paint coatings Designation of intensity,qua
27、ntity and size of common types of defect Part 2: Designation of degree of blistering.ISO 4628-3:1982, Paints and varnishes Evaluation of degradation of paint coatings Designation of intensity,quantity and size of common types of defect Part 3: Designation of degree of rusting.ISO 6270-1:1998(E) ISO2
28、ISO 4628-4:1982, Paints and varnishes - Evaluation of degradation of paint coatings Designation of intensity,quantity and size of common types of defect Part 4: Designation of degree of cracking.ISO 4628-5:1982, Paints and varnishes - Evaluation of degradation of paint coatings Designation of intens
29、ity,quantity and size of common types of defect Part 5: Designation of degree of flaking.3 PrincipleA coated test panel is exposed to continuous condensation and the effects of the exposure are evaluated by criteriaagreed in advance between the interested parties, these criteria usually being of a s
30、ubjective nature.4 Required supplementary informationFor any particular application, the test method specified in this part of ISO 6270 needs to be completed bysupplementary information. The items of supplementary information are given in annex A.5 Apparatus5.1 The apparatus shall be constructed of
31、chemically resistant materials and consist essentially of an electricallyheated water bath, designed so that the cover is formed by the blanking panels (see 5.5) or test panels, the upperfaces of which are exposed to the environment (see 5.2). It is preferable for the apparatus to be designed so tha
32、t itwill accommodate test panels of size 150 mm x 100 mm.5.2 The sides of the water bath shall be suitably insulated to ensure that the temperature in the air space abovethe water when measured approximately 25 mm below the test panels is maintained at a uniform temperature of (38 2) C unless otherw
33、ise specified (see annex A, item e).NOTE Temperatures of 49 C and 60 C are recommended if 38 C is too low.5.3 The apparatus shall be operated in a draught-free environment maintained at (23 2) C.NOTE This test method will not work if the ambient temperature is higher than the test temperature, as no
34、 condensation willbe formed on the test panels.5.4 The top of the bath shall be designed so that the test panels are held at the preferred angle of (60 5) to thehorizontal to permit drainage of condensed water, and shall be such that water draining from one panel does notcome into contact with anoth
35、er. An angle of (15 5) may be used on old equipment if specified (see the foreword).5.5 Suitable inert blanking panels shall be provided for use in setting up the apparatus and if the number of testpanels is insufficient to form a complete cover.5.6 The water used should preferably be of at least gr
36、ade 3 purity as defined in ISO 3696. Water of lower qualitymay be used, but problems may arise with build-up of insoluble matter in the water bath, which will require regularcleaning.5.7 The water shall be maintained at a constant level by means of an automatic control device.6 SamplingTake a repres
37、entative sample of the product to be tested (or of each product in the case of a multicoat system), asspecified in lSO 1512.Examine and prepare the sample for testing, as specified in ISO 1513. ISO ISO 6270:1998(E)37 Test panels7.1 Material and dimensionsUnless otherwise specified or agreed, the tes
38、t panels shall be of burnished steel complying with ISO 1514, and ofminimum dimensions 70 mm x 100 mm x 0,3 mm.NOTE As the results can be significantly affected by the thickness of the substrate, it is important to ensure that thedimensions of the panels are appropriate to the end use for which the
39、coating is being tested.7.2 Preparation and coatingUnless otherwise specified, prepare each test panel in accordance with ISO 1514 and then coat it by the specifiedmethod with the product or system under test.For many purposes, it is sufficient to coat only one face of the test panel. However, it is
40、 necessary to specifywhether the back and/or edges of the panel are to be sealed and, if so, whether it should be with the product orsystem under test or with a suitable sealant (see annex A, item b).7.3 Drying and conditioningDry (or stove) and age (if applicable) each coated test panel for the spe
41、cified time under the specified conditions,and, unless otherwise specified, condition them in a standard atmosphere in accordance with ISO 3270 for at least16 h, with free circulation of air and without exposing them to direct sunlight. The test procedure shall then becarried out as soon as possible
42、.7.4 Thickness of coatingDetermine the thickness, in micrometres, of the dry coating using one of the non-destructive procedures describedin ISO 2808.8 Method of exposure of test panelsCarry out the determination in duplicate, unless otherwise specified.8.1 Set up the apparatus with blanking panels
43、in position and allow the apparatus to come to equilibrium. When theconditions specified in 5.2 are attained, swiftly replace the blanking panels with the test panels so that the testsurface faces the water.NOTE It is recommended that a control specimen of a paint with known durability be included w
44、ith each series of test panels.In order to prevent a galvanic couple, the test panels shall not be allowed to come into contact with each other orwith other metallic material. If the panels have not been edged (see 7.2) then non-metallic filler strips shall be usedbetween the panels.8.2 Run the appa
45、ratus continuously throughout the prescribed test period, maintaining the conditions specified inclause 5.2 except for a short daily interruption (see annex A, item f) to inspect, re-arrange or remove test panels orto check and, if not performed automatically, adjust the level of the water.9 Examina
46、tion of test panels9.1 Make a periodic examination of the panels as quickly as possible, taking care not to damage the surfacesunder test. Do not remove the panels for more than 30 min in any 24 h period. Immediately replace panels whichhave been removed by blanking panels. Panels may be blotted wit
47、h absorbent paper to examine them more clearly,but shall then be immediately returned to the apparatus. They shall not be allowed to dry fully.ISO 6270-1:1998(E) ISO49.2 At the end of the specified test period, immediately examine the test surface for signs of deterioration inaccordance with the app
48、ropriate part of ISO 4628 (see annex A, item h).9.3 If required, keep the panels in the standard atmosphere in accordance with ISO 3270 for the specified periodand examine the test surfaces for deterioration.9.4 If it is required to examine the substrate for signs of attack, remove the coating by me
49、ans of a non-corrosivepaint remover unless otherwise specified.10 PrecisionThe concept of precision is not applicable to this part of ISO 6270 due to the subjective nature of the assessment(see clause 3). Users of this part of ISO 6270 should be aware that, because of this subjective assessment of thedeterioration of the coating, the actual rating will depend upon a number of factors. These include the evaluationmethod (ISO 4628), the preparation of the test panels, the th
