1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06Plastics - Methods of exposure to solar radiationPart 3: Intensified weathering using concentrated solar radiationBS EN ISO 8773:2018National forewordThis British Standard is the UK implementation of EN ISO 8773:2018. I
2、t is identical to ISO 8773:2018. It supersedes BS EN ISO 8773:2010, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PRI/21, Testing of plastics.A list of organizations represented on this committee can be obtained on request to its secretary.This publi
3、cation does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2018 Published by BSI Standards Limited 2018ISBN 978 0 580 94768 1ICS 83.080.01Compliance with a British Standard cannot confer immunity
4、 from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 June 2018.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN ISO 8773:2018EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN ISO 877-
5、3June 2018ICS 83.080.01 Supersedes EN ISO 8773:2010EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGCEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2018 CEN Ref. No. EN ISO 8773:2018: EAll rights of exploitation in any form and by any
6、 means reserved worldwide for CEN national MembersPlastics Methods of exposure to solar radiation Part 3: Intensified weathering using concentrated solar radiation (ISO 8773:2018)Plastiques Mthodes dexposition au rayonnement solaire Partie 3: Exposition intensifie par rayonnement solaire concentr (I
7、SO 8773:2018)Kunststoffe Freibewitterung Teil 3: Beschleunigte Bewitterung mit gebndelter Sonnenstrahlung (ISO 8773:2018)This European Standard was approved by CEN on 19 April 2018.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving thi
8、s European Standard the status of a national standard without any alteration. Uptodate lists and bibliographical references concerning such national standards may be obtained on application to the CENCENELEC Management Centre or to any CEN member.This European Standard exists in three official versi
9、ons (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 to the CENCENELEC Management Centre has the same status as the official versions.CEN members are the national standards bodies of Austria, Be
10、lgium, 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, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Swed
11、en, Switzerland, Turkey and United Kingdom.English VersionEN ISO 877-3:2018 (E)European forewordThis document (EN ISO 8773:2018) has been prepared by Technical Committee ISO/TC 61 “Plastics” in collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN.This
12、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 December 2018, and conflicting national standards shall be withdrawn at the latest by December 2018.Attention is drawn to the possibility that some of th
13、e elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights.This document supersedes EN ISO 8773:2010.According to the CENCENELEC Internal Regulations, the national standards organizations of the following countries
14、 are 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,
15、 Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.Endorsement noticeThe text of ISO 8773:2018 has been approved by CEN as EN ISO 8773:2018 without any modification.iiBS EN ISO 8773:2018ISO 877-3:2018Foreword ivIntroduction v1 Scope .12 Normativ
16、e references 13 Terms and definitions .14 Principle 15 Apparatus .25.1 General requirements . 25.2 Apparatus for measurement of climatic factors . 36 Test specimens37 Exposure conditions .37.1 Orientation of mirrors 37.2 Exposure site 47.3 Temperature control 47.4 Irradiance level . 58 Exposure stag
17、es .68.1 General . 68.2 Solar radiant exposure . 68.2.1 Guidance for selection of the exposure stage 68.2.2 Instrumental measurement of solar radiant exposure . 69 Procedure.79.1 Mounting of test specimens . 79.2 Mounting of reference materials (if used) 79.3 Climatic observations 79.4 Exposure of t
18、est specimens 79.4.1 General 79.4.2 Exposure cycles . 79.4.3 Testing under glass 710 Expression of results 810.1 Determination of changes in properties . 810.2 Climatic conditions and observations . 810.2.1 General 810.2.2 Temperature 810.2.3 Relative humidity 810.2.4 Levels (values) of exposure sta
19、ges . 810.2.5 Precipitation 910.2.6 Time of wetness 910.2.7 Other observations 911 Test report .9Bibliography .10 ISO 2018 All rights reserved iiiContents PageBS EN ISO 8773:2018ISO 877-3:2018ForewordISO (the International Organization for Standardization) is a worldwide federation of national stand
20、ards 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 technical committee has been established has the right to be represented on that committee. International orga
21、nizations, governmental and nongovernmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. The procedures used to develop this document and those intended for its
22、further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/dire
23、ctives).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 identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the
24、 Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement. For an explanation on the voluntary nature of standards, the meaning of ISO sp
25、ecific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.This document was prepared by Technical Committee
26、ISO/TC 61, Plastics, Subcommittee SC 6, Ageing, chemical and environmental resistance.This second edition cancels and replaces the first edition (ISO 8773:2009), which has been technically revised.A list of all the parts in the ISO 877 series can be found on the ISO website.iv ISO 2018 All rights re
27、servedBS EN ISO 8773:2018ISO 877-3:2018IntroductionThe International Organization for Standardization (ISO) draws attention to the fact that it is claimed that compliance with this document may involve the use of patents concerning temperature control described in 7.3ISO takes no position concerning
28、 the evidence, validity and scope of this patent right. The holder of this patent right has assured ISO that he/she is willing to negotiate licences under reasonable and nondiscriminatory terms and conditions with applicants throughout the world. In this respect, the statement of the holder of this
29、patent right is registered with ISO. Information may be obtained from:Atlas Material Testing Technology LLC Intellectual Property 45601 North 47th Avenue Phoenix, Arizona 85087, USAAttention is drawn to the possibility that some of the elements of this document may be the subject of patent rights ot
30、her than those identified above. ISO shall not be held responsible for identifying any or all such patent rights. ISO 2018 All rights reserved vBS EN ISO 8773:2018This page deliberately left blankPlastics - Methods of exposure to solar radiation Part 3: Intensified weathering using concentrated sola
31、r radiation1 ScopeThis document specifies a method for exposing plastics to concentrated solar radiation using reflecting concentrators to accelerate the weathering processes. The purpose is to assess property changes produced after specified stages of such exposures. The reflecting concentrators us
32、ed in these exposures are sometimes referred to as “Fresnel reflectors” because in crosssection the array of mirrors used to concentrate the solar radiation resembles the crosssection of a Fresnel lens.General guidance concerning the scope of the ISO 877 series is given in ISO 8771.NOTE Additional i
33、nformation about solar concentrating exposures, including a partial list of standards in which they are specified, is given in the Bibliography.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this d
34、ocument. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 8771, Plastics Methods of exposure to solar radiation Part 1: General guidanceISO 8772, Plastics Methods of exposure to solar ra
35、diation Part 2: Direct weathering and exposure behind window glassISO 48921, Plastics Methods of exposure to laboratory light sources Part 1: General guidanceASTM G90, Standard Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using Concentrated Natural SunlightASTM G17
36、9, Standard Specification for Metal Black Panel and White Panel Temperature Devices for Natural Weathering Tests3 Terms and definitionsNo terms and definitions are listed in this document.ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electro
37、pedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at https:/www.iso.org/obp4 PrincipleThis document describes a method for performing accelerated weathering on plastics using intensified solar radiation. General guidance is given in ISO 8771.INTERNATIONAL STANDA
38、RD ISO 877-3:2018 ISO 2018 All rights reserved 1BS EN ISO 8773:2018ISO 877-3:20185 Apparatus5.1 General requirementsRefer to ISO 8771 for general requirements.All requirements for the solar concentrating device, operation of the device and measurement of the solar radiation within the specimen expos
39、ure area shall be in accordance with ASTM G90. See Figures 1 and 2 for schematic diagrams of the two types of test apparatus.Key1 air plenum 6 mirror 11 clutch disc for elevation drive2 air blower 7 gear box 12 solar cells with shadow hat3 rotor assembly 8 mast for manual elevation adjustment 13 spe
40、cimen protection door4 air deflector 9 air flow switch 14 door release mechanism5 Aframe assembly 10 water spray nozzles Figure 1 Schematic diagram of test apparatus with single-axis tracking and manual elevation adjustment2 ISO 2018 All rights reservedBS EN ISO 8773:2018ISO 877-3:2018Key1 air plenu
41、m 7 gear box for elevation drive 13 solar cells with shadow hat2 air blower 8 control box 14 specimen protection door3 rotor assembly 9 gear box for azimuth drive 15 door release mechanism4 turntable assembly 10 air flow switch 16 air deflector5 Aframe assembly 11 water spray nozzles 6 mirror 12 clu
42、tch disc for elevation drive Figure 2 Schematic diagram of test apparatus with dual-axis tracking5.2 Apparatus for measurement of climatic factorsRefer to ISO 8771.6 Test specimensRefer to ISO 8771.NOTE When irregularly shaped specimens are used, air flow and specimen cooling can be adversely affect
43、ed. In addition, irradiance will not be uniform on all surfaces of a shaped specimen.7 Exposure conditions7.1 Orientation of mirrorsFor specific information on the orientation of the mirrors, refer to ASTM G90. ISO 2018 All rights reserved 3BS EN ISO 8773:2018ISO 877-3:20187.2 Exposure siteFresnelre
44、flecting solar concentrating devices operate most effectively at locations that receive at least 3 500 h of sunshine per year and where the average daytime relative humidity is less than 30 %. ASTM G90 provides requirements for the exposure sites average ratio of direct solar radiation to global nor
45、mal solar radiation.NOTE In regions that receive 3 500 h of solar radiation and where the average daytime relative humidity is less than 30 %, the average ratio of direct solar radiation to global normal solar radiation is at least 0,75. Areas that meet these criteria have a minimum diffuse componen
46、t of solar radiation (sky radiation). The use of reflecting solar concentrator devices in regions of moderate to high diffuse solar irradiance will substantially reduce the amount of UV radiation at the specimen target board. Moderate to high levels of humidity and urban aerosols result in scatterin
47、g of the direct component of solar radiation so that ultraviolet radiation is scattered into the hemispherical sky dome and is not available to be focused by the mirrors on to the specimen target board. This is shown in Figure 3. In addition, the use of reflecting solar concentrator devices in regio
48、ns of moderate to high diffuse solar irradiance can give different stability rankings for materials compared to exposures conducted in accordance with ISO 8772 because of the differences in UV radiation.7.3 Temperature controlSolar concentrating devices are equipped with a blower to cool the specime
49、ns. Specimen temperatures for most materials are typically 10 C higher than the maximum temperature which would be reached if an identical specimen was exposed directly to solar radiation (without concentration) at normal incidence at the same time.If more precise control of specimen temperature is required, the temperature of a black or white panel, the temperature of a black or white standard thermometer, the temperature of a particular specimen, the air temperature or the tem
