1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 877-3:2010Plastics Methods ofexposure to solar radiationPart 3: Intensified weathering usingconcentrated solar radiation (ISO877-3:2009)BS EN ISO 877-3:2010 BRITISH STA
2、NDARDNational forewordThis British Standard is the UK implementation of EN ISO 877-3:2010.It is identical to ISO 877-3:2009. Together with BS EN ISO 877-1:2010and BS EN ISO 877-2:2010, it supersedes BS EN ISO 877:1997 which iswithdrawn.The UK participation in its preparation was entrusted to Technic
3、alCommittee PRI/21, Testing of plastics.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 57
4、613 3ICS 83.080.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2011.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EURO
5、PENNE EUROPISCHE NORM EN ISO 877-3 December 2010 ICS 83.080.01 Supersedes EN ISO 877:1996English Version Plastics - Methods of exposure to solar radiation - Part 3: Intensified weathering using concentrated solar radiation (ISO 877-3:2009) Plastiques - Mthodes dexposition au rayonnement solaire - Pa
6、rtie 3: Exposition intensifie par rayonnement solaire concentr (ISO 877-3:2009) Kunststoffe - Freibewitterung - Teil 3: Beschleunigte Bewitterung mit gebndelter Sonnenstrahlung (ISO 877-3:2009) This European Standard was approved by CEN on 4 December 2010. CEN members are bound to comply with the CE
7、N/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 standards may be obtained on application to the CEN-CENELEC Management Ce
8、ntre 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 to the CEN-CENELEC Management Centre has the same status as t
9、he official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Roman
10、ia, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved w
11、orldwide for CEN national Members. Ref. No. EN ISO 877-3:2010: EBS EN ISO 877-3:2010EN ISO 877-3:2010 (E) 3 Foreword The text of ISO 877-3:2009 has been prepared by Technical Committee ISO/TC 61 “Plastics” of the International Organization for Standardization (ISO) and has been taken over as EN ISO
12、877-3:2010 by Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN. 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 June 2011, and conflicting national standards shall
13、 be withdrawn at the latest by June 2011. Attention is drawn to the possibility that some of the elements of this document 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 877:1996. Ac
14、cording to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
15、Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 877-3:2009 has been approved by CEN as a EN ISO 877-3:2010 without any modification. BS EN ISO 877-3:
16、2010ISO 877-3:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Apparatus 2 5 Test specimens . 3 6 Exposure conditions 4 7 Exposure stages . 6 8 Procedure 7 9 Expression of results . 8 10 Test report . 9 Bibliogra
17、phy . 10 BS EN ISO 877-3:2010ISO 877-3:2009(E) iv ISO 2009 All rights reservedForeword 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 IS
18、O 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 organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates c
19、losely with the International Electrotechnical Commission (IEC) on all matters of 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. D
20、raft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. ISO 877-3 was prepared by Technical Committee ISO/TC 61, Plastics, Subcomm
21、ittee SC 6, Ageing, chemical and environmental resistance. Together with the other parts (see below), it cancels and replaces ISO 877:1994, which has been technically revised. ISO 877 consists of the following parts, under the general title Plastics Methods of exposure to solar radiation: Part 1: Ge
22、neral guidance Part 2: Direct weathering and exposure behind window glass Part 3: Intensified weathering using concentrated solar radiation BS EN ISO 877-3:2010ISO 877-3:2009(E) ISO 2009 All rights reserved vIntroduction The International Organization for Standardization (ISO) draws attention to the
23、 fact that it is claimed that compliance with this document may involve the use of American patents US 6659638 B1, US 7318672 B2 and US 4807247 concerning the temperature control discussed in Subclause 6.3. ISO takes no position concerning the evidence, validity and scope of these patent rights. The
24、 holder of these patent rights has assured ISO that he is willing to negotiate licences under reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the statement of the holder of these patent rights is registered with ISO. Information may be ob
25、tained from: Atlas Material Testing Technology LLC Intellectual Property 45601 North 47th Avenue Phoenix, Arizona 85087, USA Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. ISO shall not be held r
26、esponsible for identifying any or all such patent rights. BS EN ISO 877-3:2010BS EN ISO 877-3:2010INTERNATIONAL STANDARD ISO 877-3:2009(E) ISO 2009 All rights reserved 1Plastics Methods of exposure to solar radiation Part 3: Intensified weathering using concentrated solar radiation 1 Scope This part
27、 of ISO 877 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. General guidance concerning the scope of ISO 877 is
28、 given in ISO 877-1:2009, Clause 1. The reflecting concentrators used in these exposures are sometimes referred to as “Fresnel reflectors” because in cross-section the array of mirrors used to concentrate the solar radiation resembles the cross-section of a Fresnel lens. For additional information a
29、bout solar concentrating exposures, including a partial list of standards in which they are specified, refer to the Bibliography. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. Fo
30、r undated references, the latest edition of the referenced document (including any amendments) applies. ISO 877-1:2009, Plastics Methods of exposure to solar radiation Part 1: General guidance ISO 4582, Plastics Determination of changes in colour and variations in properties after exposure to daylig
31、ht under glass, natural weathering or laboratory light sources ISO 4892-1, Plastics Methods of exposure to laboratory light sources Part 1: General guidance ASTM G 90, Standard Practice for Performing Accelerated Outdoor Weathering of Nonmetallic Materials Using Concentrated Natural Sunlight ASTM G
32、179, Standard Specification for Metal Black Panel and White Panel Temperature Devices for Natural Weathering Tests 3 Principle This part of ISO 877 describes a method for performing accelerated weathering on plastics using intensified solar radiation. General guidance is given in ISO 877-1:2009, Cla
33、use 4. BS EN ISO 877-3:2010ISO 877-3:2009(E) 2 ISO 2009 All rights reserved4 Apparatus 4.1 General requirements Refer to ISO 877-1:2009, Subclause 5.1, for general requirements. All requirements for the solar concentrating device, operation of the device and measurement of the solar radiation within
34、 the specimen exposure area shall be in accordance with ASTM G 90. See Figures 1 and 2 for schematic diagrams of the two types of test apparatus. Key 1 air plenum 6 mirror 11 clutch disc for elevation drive 2 air blower 7 gear box 12 solar cells with shadow hat 3 rotor assembly 8 mast for manual ele
35、vation adjustment 13 specimen protection door 4 air deflector 9 air flow switch 14 door release mechanism 5 A-frame assembly 10 water spray nozzles Figure 1 Schematic diagram of test apparatus with single-axis tracking and manual elevation adjustment BS EN ISO 877-3:2010ISO 877-3:2009(E) ISO 2009 Al
36、l rights reserved 3Key 1 air plenum 7 gear box for elevation drive 12 clutch disc for elevation drive 2 air blower 8 control box 13 solar cells with shadow hat 3 rotor assembly 9 gear box for azimuth drive 14 specimen protection door 4 turntable assembly 10 air flow switch 15 door release mechanism
37、5 A-frame assembly 11 water spray nozzles 16 air deflector 6 mirror Figure 2 Schematic diagram of test apparatus with dual-axis tracking 4.2 Apparatus for measurement of climatic factors Refer to ISO 877-1:2009, Subclause 5.2. 5 Test specimens Refer to ISO 877-1:2009, Clause 6. NOTE When irregularly
38、 shaped specimens are used, air flow and specimen cooling may be adversely affected. In addition, irradiance will not be uniform on all surfaces of a shaped specimen. BS EN ISO 877-3:2010ISO 877-3:2009(E) 4 ISO 2009 All rights reserved6 Exposure conditions 6.1 Orientation of mirrors For specific inf
39、ormation on the orientation of the mirrors, refer to ASTM G 90. 6.2 Exposure site Fresnel-reflecting 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 G 90 provi
40、des requirements for the exposure sites average ratio of direct solar radiation to global normal 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 so
41、lar radiation is at least 0,75. Areas that meet these criteria have a minimum diffuse component 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 spe
42、cimen target board. Moderate to high levels of humidity and urban aerosols result in scattering 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. Thi
43、s is shown in Figure 3. In addition, the use of reflecting solar concentrator devices in regions of moderate to high diffuse solar irradiance may give different stability rankings for materials compared to exposures conducted in accordance with ISO 877-2 because of the differences in UV radiation. 6
44、.3 Temperature control Solar concentrating devices are equipped with a blower to cool the specimens. 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 concen
45、tration) 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 temperature indicated
46、by a remote sensor may be monitored and used as an input to control the specimen temperature. If used, report the controlled temperature and any observed deviations in the test report. NOTE 1 Use of this method of temperature control may produce results that are not equivalent to typical solar conce
47、ntrating exposures and may require longer radiant exposures to produce the same amount of degradation. Unless otherwise specified, if measurement of black- or white-panel temperature is required, the panels shall be constructed, calibrated and maintained in accordance with ASTM G 179. Unless otherwi
48、se specified, if measurement of black- or white-standard temperature is required, the panels shall be constructed and maintained in accordance with ISO 4892-1. NOTE 2 If a black-standard temperature is used, the temperature indicated will be higher than that indicated by a black-panel thermometer un
49、der typical exposure conditions. Temperatures during the night-time are typically not controlled. If agreed upon by the interested parties, heat sources placed behind the specimens may be used to control night-time temperatures. If so, the method used to control night-time temperatures shall be included in the test report. BS EN ISO 877-3:2010ISO 877-3:2009(E) ISO 2009 All rights reserved 5Key 1 air plenum (end view) 5 flat mirror 2 specimen target board 6 mirror bed 3 test specimen 7 direct component of solar radiat
