1、BRITISH STANDARD BS EN ISO 6270-2:2005 BS 3900-F21:2005 Paints and varnishes Determination of resistance to humidity Part 2: Procedure for exposing test specimens in condensation-water atmospheres The European Standard EN ISO 6270-2:2005 has the status of a British Standard ICS 87.040 BS EN ISO 6270
2、-2:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 24 October 2005 BSI 24 October 2005 ISBN 0 580 46496 2 National foreword This British Standard is the official English language version of EN ISO 6270-2:2005. It is identical with ISO 62
3、70-2:2005. The UK participation in its preparation was entrusted to Technical Committee STI/10, Test methods for paints, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which im
4、plement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication
5、does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/Euro
6、pean committee any enquiries on the interpretation, or proposals for change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, th
7、e EN ISO foreword page, the ISO title page, pages ii to v, a blank page, pages 1 to 6, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEANSTANDARD NO
8、RMEEUROPENNE EUROPISCHENORM ENISO62702 July2005 ICS87.040 EnglishVersion PaintsandvarnishesDeterminationofresistancetohumidity Part2:Procedureforexposingtestspecimensincondensation wateratmospheres(ISO62702:2005) PeintureetvernisDterminationdelarsistance lhumiditPartie2:Mthodedexpositiondprouvettes
9、desatmosphresdeaudecondensation(ISO6270 2:2005) BeschichtungsstoffeBestimmungderBestndigkeit gegenFeuchtigkeitTeil2:VerfahrenzurBeanspruchung vonProbeninKondenswasserklimaten(ISO62702:2005) ThisEuropeanStandardwasapprovedbyCENon20June2005. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulati
10、onswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariatortoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions
11、(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodiesofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,Fr
12、ance, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENORMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStas
13、sart,36B1050Brussels 2005CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO62702:2005:E Foreword This document (EN ISO 6270-2:2005) has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes“ in collaboration with Technical Committee
14、CEN/TC 139 “Paints and varnishes“, 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 January 2006, and conflicting national standards shall be withdrawn at t
15、he latest by January 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
16、 Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 6270-2:2005 has been approved by CEN as EN ISO 6270-2:2005 without any modifications. EN ISO 6270-2:2005
17、 Reference number ISO 6270-2:2005(E)INTERNATIONAL STANDARD ISO 6270-2 First edition 2005-07-01 Paints and varnishes Determination of resistance to humidity Part 2: Procedure for exposing test specimens in condensation-water atmospheres Peinture et vernis Dtermination de la rsistance lhumidit Partie
18、2: Mthode dexposition dprouvettes des atmosphres deau de condensation EN ISO 6270-2:2005ii EN ISO 6270-2:2005 iii Contents Page Introduction v 1 Scope . 1 2 Normative references . 1 3 Designation . 1 4 General. 1 5 Apparatus 2 6 Procedure 4 7 Evaluation 5 8 Test report . 6 EN ISO 6270-2:2005 iv Fore
19、word ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a techn
20、ical 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. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
21、electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to
22、 the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for
23、identifying any or all such patent rights. ISO 6270-2 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes. ISO 6270 consists of the following parts, under the general title Paints and varnishes Determination of resista
24、nce to humidity: Part 1: Continuous condensation Part 2: Procedure for exposing test specimens in condensation-water atmospheres v Introduction ISO 6270 is intended to give consistent conditions and procedures for the conditioning of pre-prepared test specimens which are to be evaluated for defects
25、which may develop when they are subjected to humid ambient atmospheres such as constant condensation-water atmospheres or alternating condensation-water atmospheres. The tests are designed to clarify the behaviour of the test specimens in humid ambient atmospheres, and to pinpoint any defects in the
26、 protection of the test specimens against corrosion. The testing of coatings in these atmospheres does not necessarily give lifetime prediction data. After conditioning, the test specimens are evaluated either in accordance with agreed International Standards, such as the appropriate part(s) of ISO
27、4628, Paints and varnishes Evaluation of degradation of coatings Designation of quantity and size of defects, and of intensity of uniform changes in appearance, or by procedures agreed between the interested parties. EN ISO 6270-2:2005blank1 Paints and varnishes Determination of resistance to humidi
28、ty Part 2: Procedure for exposing test specimens in condensation-water atmospheres 1 Scope This part of ISO 6270 describes the general conditions and procedures which need to be observed when testing coated test specimens in constant condensation-water atmospheres or in alternating condensation- wat
29、er atmospheres, in order to ensure that the results of tests carried out in different laboratories are reproducible. NOTE The shape and preparation of the test specimens, the duration of the test and the assessment of the test results are not covered in this part of ISO 6270. 2 Normative references
30、The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 3270, Paints and varnishes and their raw mate
31、rials Temperatures and humidities for conditioning and testing 3 Designation The condensation-water test atmospheres are designated as follows: Test atmosphere CH Condensation atmosphere with constant humidity AHT Condensation atmosphere with alternating humidity and air temperature AT Condensation
32、atmosphere with alternating air temperature 4 General Condensation-water test atmospheres promote the condensation of atmospheric humidity on the surfaces of test specimens, the temperatures of which are lower than the temperature of the saturated air in the climatic chamber, due to radiation onto t
33、he chamber walls or to the cooling of the test specimen. The atmospheric temperature in the climatic chamber during the condensation process described in this part of ISO 6270 is 40 C. EN ISO 6270-2:20052 The condensation-water test atmosphere may be either a constant-humidity (CH) or an alternating
34、 (AHT, AT) atmosphere. If, in addition to the action of the condensation water, the change in atmospheric temperature and the change in atmospheric humidity have an important effect on the test specimens, an alternating atmosphere should be chosen. The quantity of condensation water formed on the su
35、rface of the coating may also exercise an important influence on the action of the water; this quantity will be affected by the ambient temperature in the installation room or by the cooling of the test specimen. The condensate which drips off the test specimens consists of condensation water and al
36、so in some instances of solid and liquid constituents of the coating dissolved in the condensation water or mixed with it. Reproducible results can only be expected if the test procedure and test conditions remain constant for a series of tests. In the case of alternating atmospheres, a cycle time o
37、f 24 h shall be used as a general rule. A shorter cycle time (12 h or 16 h) and a correspondingly shortened time for the two test periods may be used for the AT test atmosphere. A summary of test atmospheres, cycle durations and conditions is given in Table 1. Other cycles may be used by agreement b
38、etween the interested parties. Table 1 Condensation test atmospheres Test atmosphere Cycle duration Conditions in working chamber after reaching equilibrium Type Code Test period(s) Total Air temperature Relative humidity Constant-humidity condensation atmosphere CH From warm-up to end of exposure (
39、40 3) C Approx. 100 % with condensation on test specimens 8 h including warm-up (40 3) C Approx. 100 % with condensation on test specimens With alternation of humidity and air temperature AHT 16 h including cooling down (climatic chamber open or ventilated) 24 h 18 C to 28 C Approaching ambient 8 h
40、including warm-up (40 3) C Approx. 100 % with condensation on test specimens Alternating condensation atmosphere With alternation of air temperature AT 16 h including cooling down (climatic chamber closed) 24 h 18 C to 28 C Approx. 100 % ( saturated) NOTE Set points and operational fluctuations can
41、either be listed independently of each other, or they can be listed in the format “set point operational fluctuations”. The set point is the target condition for the sensor used at the operational control point as programmed by the user. Operational fluctuations are deviations from the set point at
42、the control point as indicated by the readout of the calibrated control sensor during equilibrium operation and do not include measurement uncertainty. At the operational control point, the operational fluctuation may not exceed the listed value at equilibrium. When a standard calls for a particular
43、 set point, the user programmes that exact number. The operational fluctuations specified for the set point do not imply that the user is allowed to programme a set point higher or lower than the exact set point specified. 5 Apparatus 5.1 Climatic chamber A vapour-tight climatic chamber is essential
44、 for testing in a warm and humid atmosphere. The material of the inner walls shall be corrosion-resistant and shall not affect the test specimens. The climatic chamber is usually EN ISO 6270-2:2005 3 equipped with a floor trough which acts as the receptacle for the quantity of water prescribed in Su
45、bclause 6.1. The climatic chamber shall be controlled by heating the water in the floor trough. If the quantity of heat introduced via the water is insufficient to raise the air temperature in the climatic chamber to the required level, then additional heating can be employed. NOTE The heating-up ti
46、me will depend on the nature and quantity of the test specimens, and also on the ratio of the surface of the water in the floor trough to the surface of the walls of the climatic chamber, and on the water temperature. The water temperature should preferably not exceed 60 C in order to prevent excess
47、ive vapour formation. The dimensions of the climatic chamber and the arrangement of its temperature-measuring and control equipment are optional, provided that the test conditions in accordance with Clause 4 and Subclause 6.3 are observed and that the temperature is measured. The climatic chamber sh
48、all be provided with a suitable door or other aperture capable of being closed, which allows the climatic chamber to be charged with test specimens and to be ventilated. An example of a climatic chamber is shown in Figure 1. Climatic chambers not equipped with water-filled floor troughs shall be fitted out in such a way that adequate formation of condensation water on the test specimens is achieved. Key 1 pressure-relief valve 2 tempera
