SIST EN ISO 877-3:2012
(Main)Plastics - Methods of exposure to solar radiation - Part 3: Intensified weathering using concentrated solar radiation (ISO 877-3:2009)
Plastics - Methods of exposure to solar radiation - Part 3: Intensified weathering using concentrated solar radiation (ISO 877-3:2009)
This part 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 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 about solar concentrating exposures, including a partial list of standards in which they are specified, refer to the Bibliography.
Kunststoffe - Freibewitterung - Teil 3: Beschleunigte Bewitterung mit gebündelter Sonnenstrahlung (ISO 877-3:2009)
Dieser Teil von ISO 877 legt ein Verfahren für die Beanspruchung von Kunststoffen mit gebündelter Sonnen-strahlung unter Verwendung von Fresnelsammelspiegeln zur Beschleunigung der Bewitterungs¬vorgänge fest. Das Ziel ist es, die Eigenschaftsänderungen, die nach bestimmten Stufen derartiger Beanspru¬chungen eintreten, zu beurteilen. Eine allgemeine Anleitung, die den Anwendungsbereich von ISO 877 betrifft, ist in ISO 877 1:2009, Abschnitt 1 angegeben. Die bei diesen Beanspruchungen verwendeten Sammelspiegel werden mitunter als Fresnelsammelspiegel bezeichnet, weil der Querschnitt der Spiegelanordnung, die zur Bündelung der Sonnenstrahlung angewendet wird, dem Querschnitt einer Fresnel-Linse ähnelt.
Zu zusätzlichen Informationen über Beanspruchungen mit gebündelter Sonnenstrahlung einschließlich einer Teilliste von Normen, in denen diese festgelegt sind, siehe Literaturhinweise.
Plastiques - Méthodes d'exposition au rayonnement solaire - Partie 3: Exposition intensifiée par rayonnement solaire concentré (ISO 877-3:2009)
L'ISO 877-3:2009 spécifie une méthode d'exposition des plastiques à un rayonnement solaire concentré à l'aide de concentrateurs réfléchissants pour accélérer le processus d'exposition aux intempéries. L'objectif consiste à évaluer les changements produits après des phases d'exposition spécifiées.
Polimerni materiali - Metode izpostavitve vremenskim vplivom - 3. del: Pospešeni vremenski vpliv z uporabo koncentriranega sončnega žarčenja (ISO 877-3:2009)
Ta del standarda ISO 877 določa metodo za izpostavitev plastike koncentriranemu sončnemu žarčenju z odbojnimi solarnimi koncentratorji za pospešitev vremenskega vpliva. Njegov namen je oceniti spremembe lastnosti, do katerih pride po določenih stopnjah take izpostavitve. Splošni napotki v zvezi s področjem uporabe standarda ISO 877 so podani v točki 1 standarda ISO 877-1:2009. Za odbojne koncentratorje, ki se uporabljajo pri teh izpostavitvah, se včasih uporablja izraz »Fresnelovi kolektorji«, ker je razporeditev ogledal, ki se uporablja za koncentracijo sončnega žarčenja, v prerezu podobna Fresnelovi leči. Za več informacij o izpostavitvah koncentriranemu sončnemu žarčenju, vključno z nepopolnim seznamom standardov, v katerih so določene, glejte bibliografijo.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 877-3:2012
01-september-2012
1DGRPHãþD
SIST EN ISO 877:2000
3ROLPHUQLPDWHULDOL0HWRGHL]SRVWDYLWYHYUHPHQVNLPYSOLYRPGHO 3RVSHãHQL
YUHPHQVNLYSOLY]XSRUDERNRQFHQWULUDQHJDVRQþQHJDåDUþHQMD ,62
Plastics - Methods of exposure to solar radiation - Part 3: Intensified weathering using
concentrated solar radiation (ISO 877-3:2009)
Kunststoffe - Freibewitterung - Teil 3: Beschleunigte Bewitterung mit gebündelter
Sonnenstrahlung (ISO 877-3:2009)
Plastiques - Méthodes d'exposition au rayonnement solaire - Partie 3: Exposition
intensifiée par rayonnement solaire concentré (ISO 877-3:2009)
Ta slovenski standard je istoveten z: EN ISO 877-3:2010
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 877-3:2012 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 877-3:2012
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SIST EN ISO 877-3:2012
EUROPEAN STANDARD
EN ISO 877-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2010
ICS 83.080.01 Supersedes EN ISO 877:1996
English Version
Plastics - Methods of exposure to solar radiation - Part 3:
Intensified weathering using concentrated solar radiation (ISO
877-3:2009)
Plastiques - Méthodes d'exposition au rayonnement solaire Kunststoffe - Freibewitterung - Teil 3: Beschleunigte
- Partie 3: Exposition intensifiée par rayonnement solaire Bewitterung mit gebündelter Sonnenstrahlung (ISO 877-
concentré (ISO 877-3:2009) 3:2009)
This European Standard was approved by CEN on 4 December 2010.
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 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 Centre 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 the 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 877-3:2010: E
worldwide for CEN national Members.
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SIST EN ISO 877-3:2012
EN ISO 877-3:2010 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 877-3:2012
EN ISO 877-3:2010 (E)
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 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 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.
According 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, 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.
3
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SIST EN ISO 877-3:2012
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SIST EN ISO 877-3:2012
INTERNATIONAL ISO
STANDARD 877-3
First edition
2009-06-01
Plastics — Methods of exposure to solar
radiation —
Part 3:
Intensified weathering using
concentrated solar radiation
Plastiques — Méthodes d'exposition au rayonnement solaire —
Partie 3: Exposition intensifiée par rayonnement solaire concentré
Reference number
ISO 877-3:2009(E)
©
ISO 2009
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SIST EN ISO 877-3:2012
ISO 877-3:2009(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
COPYRIGHT PROTECTED DOCUMENT
© ISO 2009
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2009 – All rights reserved
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SIST EN ISO 877-3:2012
ISO 877-3:2009(E)
Contents 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
Bibliography . 10
© ISO 2009 – All rights reserved iii
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SIST EN ISO 877-3:2012
ISO 877-3:2009(E)
Foreword
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 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 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. Draft 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, Subcommittee 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: General guidance
⎯ Part 2: Direct weathering and exposure behind window glass
⎯ Part 3: Intensified weathering using concentrated solar radiation
iv © ISO 2009 – All rights reserved
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SIST EN ISO 877-3:2012
ISO 877-3:2009(E)
Introduction
The International Organization for Standardization (ISO) draws attention to the 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 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 obtained 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 responsible for identifying any or all such patent
rights.
© ISO 2009 – All rights reserved v
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SIST EN ISO 877-3:2012
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SIST EN ISO 877-3:2012
INTERNATIONAL STANDARD ISO 877-3:2009(E)
Plastics — Methods of exposure to solar radiation —
Part 3:
Intensified weathering using concentrated solar radiation
1 Scope
This part 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 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 about 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. For 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
daylight 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 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, Clause 4.
© ISO 2009 – All rights reserved 1
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SIST EN ISO 877-3:2012
ISO 877-3:2009(E)
4 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 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 elevation 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
2 © ISO 2009 – All rights reserved
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SIST EN ISO 877-3:2012
ISO 877-3:2009(E)
Key
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
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 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.
© ISO 2009 – All rights reserved 3
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SIST EN ISO 877-3:2012
ISO 877-3:2009(E)
6 Exposure conditions
6.1 Orientation of mirrors
For specific information 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
provides requirements for the exposure site’s 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 solar 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
specimen target board.
...
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kunststoffe - Freibewitterung - Teil 3: Beschleunigte Bewitterung mit gebündelter Sonnenstrahlung (ISO 877-3:2009)Plastiques - Méthodes d'exposition au rayonnement solaire - Partie 3: Exposition intensifiée par rayonnement solaire concentré (ISO 877-3:2009)Plastics - Methods of exposure to solar radiation - Part 3: Intensified weathering using concentrated solar radiation (ISO 877-3:2009)83.080.01Polimerni materiali na splošnoPlastics in generalICS:Ta slovenski standard je istoveten z:FprEN ISO 877-3kSIST FprEN ISO 877-3:2010en,fr,de01-september-2010kSIST FprEN ISO 877-3:2010SLOVENSKI
STANDARD
kSIST FprEN ISO 877-3:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
FINAL DRAFT
FprEN ISO 877-3
June 2010 ICS 83.080.01 Will supersede 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 - Méthodes d'exposition au rayonnement solaire - Partie 3: Exposition intensifiée par rayonnement solaire concentré (ISO 877-3:2009)
Kunststoffe - Freibewitterung - Teil 3: Beschleunigte Bewitterung mit gebündelter Sonnenstrahlung (ISO 877-3:2009) This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee CEN/TC 249.
If this draft becomes a European Standard, 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 standard without any alteration.
This draft European Standard was established by CEN 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 Management Centre has the same status as the 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. FprEN ISO 877-3:2010: EkSIST FprEN ISO 877-3:2010
FprEN ISO 877-3:2010 (E) 2 Contents Page Foreword .3 kSIST FprEN ISO 877-3:2010
FprEN 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 FprEN ISO 877-3:2010 by Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN. This document is currently submitted to the Unique Acceptance Procedure. This document will supersede EN ISO 877:1996. Endorsement notice The text of ISO 877-3:2009 has been approved by CEN as a FprEN ISO 877-3:2010 without any modification.
kSIST FprEN ISO 877-3:2010
kSIST FprEN ISO 877-3:2010
Reference numberISO 877-3:2009(E)© ISO 2009
INTERNATIONAL STANDARD ISO877-3First edition2009-06-01Plastics — Methods of exposure to solar radiation — Part 3: Intensified weathering using concentrated solar radiation Plastiques — Méthodes d'exposition au rayonnement solaire —
Partie 3: Exposition intensifiée par rayonnement solaire concentré
kSIST FprEN ISO 877-3:2010
ISO 877-3:2009(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
COPYRIGHT PROTECTED DOCUMENT
©
ISO 2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 • CH-1211 Geneva 20 Tel.
+ 41 22 749 01 11 Fax
+ 41 22 749 09 47 E-mail
copyright@iso.org Web
www.iso.org Published in Switzerland
ii © ISO 2009 – All rights reserved
kSIST FprEN ISO 877-3:2010
ISO 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 Bibliography.10
kSIST FprEN ISO 877-3:2010
ISO 877-3:2009(E) iv © ISO 2009 – All rights reserved Foreword 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 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 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. Draft 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, Subcommittee 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: General guidance ⎯ Part 2: Direct weathering and exposure behind window glass ⎯ Part 3: Intensified weathering using concentrated solar radiation kSIST FprEN ISO 877-3:2010
ISO 877-3:2009(E) © ISO 2009 – All rights reserved vIntroduction The International Organization for Standardization (ISO) draws attention to the 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 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 obtained 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 responsible for identifying any or all such patent rights.
kSIST FprEN ISO 877-3:2010
kSIST FprEN ISO 877-3:2010
INTERNATIONAL 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 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 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 about 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. For 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 daylight 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 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, Clause 4. kSIST FprEN ISO 877-3:2010
ISO 877-3:2009(E) 2 © ISO 2009 – All rights reserved 4 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 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 elevation 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 kSIST FprEN ISO 877-3:2010
ISO 877-3:2009(E) © ISO 2009 – All rights reserved 3 Key 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 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 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. kSIST FprEN ISO 877-3:2010
ISO 877-3:2009(E) 4 © ISO 2009 – All rights reserved 6 Exposure conditions 6.1 Orientation of mirrors For specific information 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 provides requirements for the exposure site’s 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 solar 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 specimen 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. This 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. 6.3 Temperature control
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