1、BSI Standards PublicationBS EN ISO 16474-2:2013Paints and varnishes Methods of exposure tolaboratory light sourcesPart 2: Xenon-arc lamps (ISO16474-2:2013)BS EN ISO 16474-2:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN ISO 16474-2:2013. Together with BS E
2、N ISO 16474-1:2013, it supersedes BS EN ISO 11341:2004, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee STI/10, Test methods for paints.A list of organizations represented on this committee can be obtained on request to its secretary.This publication d
3、oes not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2014. Published by BSI Standards Limited 2014ISBN 978 0 580 71944 8 ICS 87.040 Compliance with a British Standard cannot confer immunity from le
4、gal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2014.Amendments/corrigenda issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 16474-2 November 2013 ICS 87.040 English
5、Version Paints and varnishes - Methods of exposure to laboratory light sources - Part 2: Xenon-arc lamps (ISO 16474-2:2013) Peintures et vernis - Mthodes dexposition des sources lumineuses de laboratoire - Partie 2: Lampes arc au xnon (ISO 16474-2:2013) Beschichtungsstoffe - Knstliches Bestrahlen od
6、er Bewittern in Gerten - Teil 2: Xenonbogenlampen (ISO 16474-2:2013) This European Standard was approved by CEN on 26 October 2013. 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 stan
7、dard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in a
8、ny other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Rep
9、ublic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEA
10、N COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 16474-2:2013 EB
11、S EN ISO 16474-2:2013EN ISO 16474-2:2013 (E) 3 Foreword This document (EN ISO 16474-2:2013) has been prepared by Technical Committee ISO/TC 35 “Paints and varnishes“ in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of which is held by DIN. This European Sta
12、ndard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2014, and conflicting national standards shall be withdrawn at the latest by May 2014. Attention is drawn to the possibility that some of the elements of this do
13、cument may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN ISO 11341:2004. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries a
14、re bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, P
15、ortugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 16474-2:2013 has been approved by CEN as EN ISO 16474-2:2013 without any modification. BS EN ISO 16474-2:2013ISO 16474-2:2013(E) ISO 2013 All rights reserved iiiContent
16、s PageForeword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 14 Principle 25 Apparatus . 35.1 Laboratory light source . 35.2 Test chamber 45.3 Radiometer . 55.4 Black-standard/black-panel thermometer . 55.5 Wetting and humidity-control equipment 55.6 Specimen holders .
17、 55.7 Apparatus to assess changes in properties 66 Test specimens 67 Exposure conditions . 67.1 Radiation 67.2 Temperature 67.3 Relative humidity of chamber air . 77.4 Spray cycle 87.5 Cycles with dark periods 87.6 Sets of exposure conditions . 98 Procedure. 98.1 General . 98.2 Mounting the test spe
18、cimens 98.3 Exposure . 98.4 Duration of test 108.5 Measurement of radiant exposure 108.6 Determination of changes in properties after exposure 109 Test report 10Annex A (informative) Filtered xenon-arc radiation Spectral power distribution 11Annex B (normative) Additional exposure cycles 13Bibliogra
19、phy .15BS EN ISO 16474-2:2013ISO 16474-2:2013(E)ForewordISO (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 me
20、mber 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. ISO collaborates closely with the International E
21、lectrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different type
22、s of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2. www.iso.org/directivesAttention 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 re
23、sponsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received. www.iso.org/patentsAny trade name used in this document is information given for
24、 the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see the following URL:
25、 Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes.This first edition of ISO 16474-2, together with ISO 16474-1, cancels and replaces ISO 11341:2004 which has been techn
26、ically revised. ISO 16474 consists of the following parts, under the general title Paints and varnishes Methods of exposure to laboratory light sources: Part 1: General guidance Part 2: Xenon-arc lamps Part 3: Fluorescent UV lamps Part 4: Open-flame carbon-arc lampsiv ISO 2013 All rights reservedBS
27、EN ISO 16474-2:2013ISO 16474-2:2013(E)IntroductionCoatings of paints, varnishes and similar materials (subsequently referred to simply as coatings) are exposed to laboratory light sources, in order to simulate in the laboratory the ageing processes which occur during natural weathering or during exp
28、osure tests under glass cover. ISO 2013 All rights reserved vBS EN ISO 16474-2:2013BS EN ISO 16474-2:2013Paints and varnishes Methods of exposure to laboratory light sources Part 2: Xenon-arc lamps1 ScopeThis part of ISO 16474 specifies methods for exposing specimens to xenon-arc light in the presen
29、ce of moisture to reproduce the weathering effects that occur when materials are exposed in actual end-use environments to daylight or to daylight filtered through window glass.The specimens are exposed to filtered xenon-arc light under controlled conditions (temperature, humidity and/or wetting). V
30、arious types of xenon-arc lamps and various filter combinations may be used to meet all the requirements for testing different materials.Specimen preparation and evaluation of the results are covered in other International Standards for specific materials.General guidance is given in ISO 16474-1.NOT
31、E Xenon-arc exposures for plastics are described in ISO 4892-2.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the
32、latest edition of the referenced document (including any amendments) applies.ISO 4618, Paints and varnishes Terms and definitionsISO 9370, Plastics Instrumental determination of radiant exposure in weathering tests General guidance and basic test methodISO 16474-1, Paints and varnishes Methods of ex
33、posure to laboratory light sources Part 1: General guidance3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.3.1radiant exposureHamount of radiant energy to which a test panel has been exposedNote 1 to entry: Radiant exposur
34、e is given by the equation HEt=d .INTERNATIONAL STANDARD ISO 16474-2:2013(E) ISO 2013 All rights reserved 1BS EN ISO 16474-2:2013ISO 16474-2:2013(E)whereH is the radiant exposure, in joules per square metre;E is the irradiance, in watts per square metre;t is the exposure time, in seconds.Note 2 to e
35、ntry: If the irradiance E is constant throughout the whole exposure time, the radiant exposure H is given simply by the product of E and t.4 Principle4.1 A xenon arc, fitted with suitable filters and properly maintained, is used to simulate the spectral power distribution of daylight in the ultravio
36、let (UV) and visible regions of the spectrum.4.2 Specimens are exposed to various levels of irradiance (radiant exposure), heat, relative humidity and water (see 4.4) under controlled environmental conditions.4.3 The exposure conditions may be varied by selection ofa) the light filter(s);b) the irra
37、diance level;c) the temperature during light exposure;d) the relative humidity of the chamber air during light and dark exposures, when test conditions requiring control of humidity are used;e) the type of wetting (see 4.4);f) the water temperature and wetting cycle;g) the timing of the light/dark c
38、ycle.4.4 Wetting is usually produced by spraying the test specimens with demineralized/deionized water, by immersion in water or by condensation of water vapour onto the surfaces of the specimens.4.5 The procedure shall include measurements of the irradiance and radiant exposure in the plane of the
39、specimens.4.6 It is recommended that a similar material of known performance (a control) be exposed simultaneously with the test specimens to provide a standard for comparative purposes.4.7 Intercomparison of results obtained from specimens exposed in different equipments should not be made unless a
40、n appropriate statistical relationship has been established between the equipments for the particular material to be tested.2 ISO 2013 All rights reservedBS EN ISO 16474-2:2013ISO 16474-2:2013(E)5 Apparatus5.1 Laboratory light source5.1.1 GeneralThe light source shall comprise one or more quartz-jac
41、keted xenon-arc lamps which emit radiation from below 270 nm in the ultraviolet through the visible spectrum and into the infrared. In order to simulate daylight, filters shall be used to remove short-wavelength UV radiation (method A, see Table 1). Filters to minimize irradiance at wavelengths shor
42、ter than 310 nm shall be used to simulate daylight through window glass (method B, see Table 2). In addition, filters to remove infrared radiation may be used to prevent unrealistic heating of the test specimens, which can cause thermal degradation not experienced during outdoor exposures.NOTE Solar
43、 spectral irradiance for a number of different atmospheric conditions is described in CIE No. 85. The benchmark daylight used in this part of ISO 16474 is that defined in CIE No. 85:1989, Table 4.5.1.2 Spectral irradiance of xenon-arc lamps with daylight filtersFilters are used to filter xenon-arc e
44、missions in order to simulate daylight (CIE No. 85:1989, Table 42). The minimum and maximum levels of the relative spectral irradiance in the UV wavelength range are given in Table 1 (see also Annex A).Table 1 Relative spectral irradiance of xenon-arc lamps with daylight filter a,b(method A)Spectral
45、 passband MinimumcCIE No. 85:1989, Table 4 d,eMaximumc( = wavelength in nm) % % % 290 0,15290 320 2,6 5,4 7,9320 360 28,2 38,2 39,8360 400 54,2 56,4 67,5aThis table gives the irradiance in the given passband, expressed as a percentage of the total irradiance between 290 nm and 400 nm. To determine w
46、hether a specific filter or set of filters for a xenon-arc lamp meets the requirements of this table, the spectral irradiance has to be measured from 250 nm to 400 nm. Typically, this is done in 2 nm increments. The total irradiance in each wavelength passband is then summed and divided by the total
47、 irradiance from 290 nm to 400 nm.bThe minimum and maximum limits in this table are based on more than 100 spectral irradiance measurements with water- and air-cooled xenon-arc lamps with daylight filters from different production lots and of various ages, used in accordance with the recommendations
48、 of the manufacturer. As more spectral irradiance data become available, minor changes in the limits are possible. The minimum and maximum limits are at least three sigma from the mean for all the measurements.cThe minimum and maximum columns will not necessarily sum to 100 % because they represent
49、the minima and maxima for the measurement data used. For any individual spectral irradiance, the percentages calculated for the passbands in this table will sum to 100 %. For any individual xenon-arc lamp with daylight filters, the calculated percentage in each passband shall fall within the minimum and maximum limits given. Exposure results can be expected to differ if obtained using xenon-arc apparatus in which the spectral irradiances differ by as much as that allowed by the tolerances. Contact the manufac
