SIST EN ISO 4892-3:2014
(Main)Plastics - Methods of exposure to laboratory light sources - Part 3: Fluorescent UV lamps (ISO 4892-3:2013)
Plastics - Methods of exposure to laboratory light sources - Part 3: Fluorescent UV lamps (ISO 4892-3:2013)
This part of ISO 4892 specifies methods for exposing specimens to fluorescent UV radiation, heat and water in apparatus designed to simulate the weathering effects that occur when materials are exposed in actual enduse environments to daylight, or to daylight through window glass. The specimens are exposed to fluorescent UV lamps under controlled environmental conditions (temperature, humidity and/or water). Different types of fluorescent UV lamp may be used to meet all the requirements for testing different materials. Specimen preparation and evaluation of the results are covered in other ISO documents for specific materials. General guidance is given in ISO 4892-1.
Kunststoffe - Künstliches Bestrahlen oder Bewittern in Geräten - Teil 3: UV-Leuchtstofflampen (ISO 4892-3:2013)
Dieser Teil von ISO 4892 legt Verfahren fest, bei denen Probekörper in einem Gerät einer UV-Leuchtstofflampenstrahlung, Wärme und Wasser ausgesetzt werden, um die Bewitterungseffekte nachzubilden, die auftreten, wenn Werkstoffe in realen, beim Endgebrauch vorzufindenden Umgebungen der Globalstrahlung oder Globalstrahlung hinter Fensterglas ausgesetzt sind. Die Probekörper werden bei geregelten Umgebungsbedingungen (Temperatur, Luftfeuchte und/oder Benässung) UV-Leuchtstofflampenstrahlung ausgesetzt. Um alle Anforderungen für das Prüfen unterschiedlicher Werkstoffe zu erfüllen, können verschiedene Typen UV-Leuchtstofflampen verwendet werden. Die Vorbereitung der Probekörper und die Auswertung der Ergebnisse werden in anderen, für bestimmte
Werkstoffe vorgesehenen ISO-Dokumenten behandelt. Eine allgemeine Anleitung ist in ISO 4892-1 gegeben. ANMERKUNG Die Beanspruchung von Beschichtungsstoffen mit UV-Leuchtstofflampenstrahlung ist in ISO 11507 [4]
beschrieben.
Plastiques - Méthodes d'exposition à des sources lumineuses de laboratoire - Partie 3: Lampes fluorescentes UV (ISO 4892-3:2013)
Polimerni materiali - Metode izpostavljanja laboratorijskim virom svetlobe - 3. del: Fluorescentne UV-svetilke (ISO 4892-3:2013)
Ta del standarda ISO 4892 navaja metode izpostavitve preskusnih vzorcev fluorescenčnemu ultravijoličnemu sevanju, toploti in vodi v aparatu, ki je zasnovan za poustvaritev vremenskih vplivov, do katerih pride, ko so materiali v okolju, kjer se uporabljajo, izpostavljeni neposredni dnevni svetlobi ali dnevni svetlobi, ki se filtrira skozi okensko steklo. Preskusnih vzorcev so izpostavljeni fluorescenčnim ultravijoličnim sijalkam v okolju z nadzorovanimi okoljskimi pogoji (temperatura, vlažnost in/ali voda.) Za izpolnjevanje vseh zahtev pri preskušanju različnih materialov bodo morda potrebne različne vrste fluorescenčnih ultravijoličnih sijalk. Priprava preskusnih vzorcev in vrednotenje rezultatov za določene materiale sta obravnavana v drugih dokumentih ISO. Splošne smernice so podane v standardu ISO 4892-1.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 4892-3:2014
01-maj-2014
1DGRPHãþD
SIST EN ISO 4892-3:2006
Polimerni materiali - Metode izpostavljanja laboratorijskim virom svetlobe - 3. del:
Fluorescentne UV-svetilke (ISO 4892-3:2013)
Plastics - Methods of exposure to laboratory light sources - Part 3: Fluorescent UV lamps
(ISO 4892-3:2013)
Kunststoffe - Künstliches Bestrahlen oder Bewittern in Geräten - Teil 3: UV-
Leuchtstofflampen (ISO 4892-3:2013)
Plastiques - Méthodes d'exposition à des sources lumineuses de laboratoire - Partie 3:
Lampes fluorescentes UV (ISO 4892-3:2013)
Ta slovenski standard je istoveten z: EN ISO 4892-3:2013
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 4892-3:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 4892-3:2014
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SIST EN ISO 4892-3:2014
EUROPEAN STANDARD
EN ISO 4892-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2013
ICS 83.080.01 Supersedes EN ISO 4892-3:2006
English Version
Plastics - Methods of exposure to laboratory light sources - Part
3: Fluorescent UV lamps (ISO 4892-3:2013)
Plastiques - Méthodes d'exposition à des sources Kunststoffe - Künstliches Bestrahlen oder Bewittern in
lumineuses de laboratoire - Partie 3: Lampes fluorescentes Geräten - Teil 3: UV-Leuchtstofflampen (ISO 4892-3:2013)
UV (ISO 4892-3:2013)
This European Standard was approved by CEN on 24 August 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 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, 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.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR 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 Ref. No. EN ISO 4892-3:2013: E
worldwide for CEN national Members.
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SIST EN ISO 4892-3:2014
EN ISO 4892-3:2013 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 4892-3:2014
EN ISO 4892-3:2013 (E)
Foreword
This document (EN ISO 4892-3:2013) 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 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 March 2014, and conflicting national standards shall be withdrawn at
the latest by March 2014.
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 4892-3:2006.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 4892-3:2013 has been approved by CEN as EN ISO 4892-3:2013 without any modification.
3
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SIST EN ISO 4892-3:2014
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SIST EN ISO 4892-3:2014
INTERNATIONAL ISO
STANDARD 4892-3
Third edition
2013-09-15
Plastics — Methods of exposure to
laboratory light sources —
Part 3:
Fluorescent UV lamps
Plastiques — Méthodes d’exposition à des sources lumineuses de
laboratoire —
Partie 3: Lampes fluorescentes UV
Reference number
ISO 4892-3:2013(E)
©
ISO 2013
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SIST EN ISO 4892-3:2014
ISO 4892-3:2013(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2013
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested 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 2013 – All rights reserved
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SIST EN ISO 4892-3:2014
ISO 4892-3:2013(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Apparatus . 2
4.1 Laboratory light source . 2
4.2 Test chamber . 5
4.3 Radiometer . 5
4.4 Black-panel/black-standard thermometer . 5
4.5 Wetting . 6
4.6 Specimen holders . 6
4.7 Apparatus to assess changes in properties . 6
5 Test specimens. 6
6 Test conditions . 7
6.1 Radiation . 7
6.2 Temperature . 7
6.3 Condensation and spray cycles . 7
6.4 Cycles with dark periods . 7
6.5 Sets of exposure conditions . 7
7 Procedure. 8
7.1 General . 8
7.2 Mounting the test specimens . 8
7.3 Exposure . 9
7.4 Measurement of radiant exposure . 9
7.5 Determination of changes in properties after exposure . 9
8 Exposure report . 9
Annex A (informative) Relative irradiance of typical fluorescent UV lamps .10
Bibliography .15
© ISO 2013 – All rights reserved iii
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SIST EN ISO 4892-3:2014
ISO 4892-3:2013(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.
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 types 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/directives
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 Introduction and/or
on the ISO list of patent declarations received. 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.
The committee responsible for this document is ISO/TC 61, Plastics, Subcommittee SC 6, Ageing, chemical
and environmental resistance.
This third edition cancels and replaces the second edition (ISO 4892-3:2006), which has been
technically revised.
The main technical changes are:
a) Table 4 explains cycles, lamp types and irradiance with greater clarity;
b) the term “daylight” has been replaced throughout by “global solar radiation”;
c) in Table 4, combination lamp option has been transferred to Annex A.
ISO 4892 consists of the following parts, under the general title Plastics — 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 lamps
iv © ISO 2013 – All rights reserved
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SIST EN ISO 4892-3:2014
INTERNATIONAL STANDARD ISO 4892-3:2013(E)
Plastics — Methods of exposure to laboratory light sources —
Part 3:
Fluorescent UV lamps
1 Scope
This part of ISO 4892 specifies methods for exposing specimens to fluorescent UV radiation, heat and
water in apparatus designed to simulate the weathering effects that occur when materials are exposed
in actual end-use environments to global solar radiation, or to solar radiation through window glass.
The specimens are exposed to fluorescent UV lamps under controlled environmental conditions
(temperature, humidity and/or water). Different types of fluorescent UV lamp can 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 4892-1.
[4]
NOTE Fluorescent UV lamp exposures for paints, varnishes and other coatings are described in ISO 11507.
2 Normative references
The 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 latest edition of the referenced document (including any amendments) applies.
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
3 Principle
3.1 Fluorescent UV lamps, when following the manufacturer’s recommendations for lamp
maintenance and/or rotation, may be used to simulate the spectral irradiance of global solar radiation
in the short wavelength ultraviolet (UV) region of the spectrum.
3.2 Specimens are exposed to various levels of UV radiation, heat and moisture (see 3.4) under
controlled environmental conditions.
3.3 The exposure conditions may be varied by selection of:
a) type of fluorescent UV lamp;
b) irradiance level;
c) temperature during the UV exposure;
d) type of wetting (see 3.4);
e) wetting temperature and cycle;
f) timing of the UV/dark cycle.
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SIST EN ISO 4892-3:2014
ISO 4892-3:2013(E)
3.4 Wetting is usually produced by condensation of water vapour on to the exposed specimen
surface or by spraying the test specimens with demineralized/deionized water.
3.5 The procedure(s) may include measurement of the irradiance and the radiant exposure in the
plane of the specimen.
3.6 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.
3.7 Intercomparison of results obtained from specimens exposed in different types of apparatus or
to different types of lamp should not be made unless an appropriate statistical relationship has been
established between the different types of equipment for the material to be tested.
4 Apparatus
4.1 Laboratory light source
4.1.1 Fluorescent UV lamps are fluorescent lamps in which radiant emission in the ultraviolet region
of the spectrum, i.e. below 400 nm, makes up at least 80 % of the total light output. There are three types
of fluorescent UV lamp used in this part of ISO 4892:
— UVA-340 (type 1A) fluorescent UV lamp: these lamps have a radiant emission below 300 nm of
less than 1 % of the total light output, have an emission peak at 343 nm, and are more commonly
identified as UVA-340 for simulation of global solar radiation from 300 nm to 340 nm (see Table 1).
Figure A.1 is a graph of spectral irradiance from 250 nm to 400 nm of a typical UVA-340 (type 1A)
fluorescent lamp compared to global solar radiation.
— UVA-351 (type 1B) fluorescent UV lamp: these lamps have a radiant emission below 310 nm of
less than 1 % of the total light output, have a peak emission at 353 nm, and are more commonly
identified as UVA-351 for simulation of the UV portion of solar radiation behind window glass (see
Table 2). Figure A.2 is a graph of spectral irradiance from 250 nm to 400 nm of a typical UVA-351
(type 1B) fluorescent UV lamp compared to global solar radiation filtered by window glass.
— UVB-313 (type 2) fluorescent UV lamp: these lamps are more commonly identified as UVB-313
and have a radiant emission below 300 nm that is more than 10 % of the total output and a peak
emission at 313 nm (see Table 3). Figure A.3 is a graph of the spectral irradiance from 250 nm to
400 nm of two typical UVB-313 (type 2) fluorescent lamps compared to global solar radiation. UVB-
313 (type 2) lamps may be used only by agreement between the parties concerned. Such agreement
shall be stated in the test report.
— Four different UV lamps used as one combination: these four different UV lamps are used
together as one combination with a suited filter. See Figure A.4 in A.2.3.
NOTE 1 UVB-313 (type 2) lamps have a spectral distribution of radiation, which peaks near the 313 nm
mercury line and can emit radiation down to λ = 254 nm, which can initiate ageing processes that never occur in
end-use environments.
NOTE 2 The solar spectral irradiance for a number of different atmospheric conditions is described in
[1]
CIE Publication No. 85. The benchmark global solar radiation used in this part of ISO 4892 is from Table 4 of
CIE Publication No. 85:1989.
4.1.2 Unless otherwise specified, UVA-340 (type 1A) fluorescent UV lamps shall be used to simulate the
UV part of global solar radiation (see Table 4, method A). Unless otherwise specified, UVA-351 (type 1B)
lamps shall be used to simulate the UV part of solar radiation through window glass (see Table 4,
method B). The four lamp UV combination may be used (see A.2.3) and shall be stated in the test report.
4.1.3 Fluorescent lamps age significantly with extended use. If an automatic irradiance control system
is not used, follow the apparatus manufacturer’s instructions on the procedure necessary to maintain
the desired irradiance.
2 © ISO 2013 – All rights reserved
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SIST EN ISO 4892-3:2014
ISO 4892-3:2013(E)
4.1.4 Irradiance uniformity shall be in accordance with the requirements specified in ISO 4892-1.
Requirements for periodic repositioning of specimens when irradiance within the exposure area is less
than 90 % of the peak irradiance are described in ISO 4892-1.
Table 1 — Relative ultraviolet spectral irradiance for UVA-340 (type 1A) lamps for global solar
ab
UV radiation (method A)
Spectral passband
c de c
Minimum CIE No. 85:1989, Table 4 Maximum
[λ = wavelength
% % %
in nanometres (nm)]
λ < 290 – 0 0,1
290 ≤ λ ≤ 320 5,9 5,4 9,3
320 < λ ≤ 360 60,9 38,2 65,5
360 < λ ≤ 400 26,5 56,4 32,8
a
This table gives the irradiance in the given passband, expressed as a percentage of the total irradiance between 290 nm
and 400 nm. To determine whether or not a specific UVA-340 (type 1A) lamp meets the requirements of this table, the
spectral irradiance from 250 nm to 400 nm shall be measured. Typically, this is done in 2 nm increments. The total irradiance
in each passband is then summed and divided by the total irradiance between 290 nm and 400 nm.
b
The minimum and maximum limits for UVA-340 (type 1A) lamps in this table are based on more than 60 spectral
[[2]]
irradiance measurements with UVA-340 (type 1A) lamps from different production lots and of various ages. The spectral
irradiance data are for lamps within the ageing recommendations of the manufacturer of the apparatus. 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.
c
The minimum and maximum columns will not necessarily sum to 100 % because they represent the minima and
maxima for the measurement data used. For any individual spectral irradiance distribution, the percentages calculated
for the passbands in this table will sum to 100 %. For any individual UVA-340 (type 1A) fluorescent lamp, the calculated
percentage in each passband shall fall within the minimum and maximum limits given. Test results can be expected to differ
between exposures using UVA-340 (type 1A) lamps in which the spectral irradiance differs by as much as that allowed by
the tolerances. Contact the manufacturer of the fluorescent UV apparatus for specific spectral irradiance data for the UVA-
340 (type 1A) lamp used.
d
The data from Table 4 of CIE Publication No. 85:1989 are the global solar irradiance on a horizontal surface for an air
mass of 1,0, an ozone column of 0,34 cm at STP, 1,42 cm of precipitable water vapour and a spectral optical depth of aerosol
extinction of 0,1 at 500 nm. These data are provided for reference purposes only and are intended to serve as a target.
e
For the solar spectrum represented by Table 4 of CIE No. 85:1989, the UV irradiance (290 nm to 400 nm) is 11 % and
the visible irradiance (400 nm to 800 nm) is 89 %, expressed as a percentage of the total irradiance from 290 nm to 800 nm.
Because the primary emission of fluorescent UV lamps is concentrated in the 300 nm to 400 nm passband, there are limited
data available for the visible light emission of fluorescent UV lamps. The percentages of UV irradiance and visible irradiance
on specimens exposed in fluorescent UV apparatus may vary due to the number of specimens being exposed and their
reflectance properties.
© ISO 2013 – All rights reserved 3
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SIST EN ISO 4892-3:2014
ISO 4892-3:2013(E)
Table 2 — Relative ultraviolet spectral irradiance for UVA-351 (type 1B) lamps for solar
ab
radiation behind window glass (method B)
c c
Spectral passband Minimum CIE No. 85:1989, Table 4, Maximum
[λ = wavelength % plus effect of window %
de
glass
in nanometres (nm)]
%
λ < 300 0 0,2
300 ≤ λ ≤ 320 1,1 ≤1 3,3
320 < λ ≤ 360 60,5 33,1 66,8
360 < λ ≤ 400 30,0 66,0 38,0
a
This table gives the irradiance in the given passband, expressed as a percentage of the total irradiance between 290 nm
and 400 nm. To determine whether a specific UVA-351 (type 1B) lamp meets the requirements of this table, the spectral
irradiance from 250 nm to 400 nm shall be measured. The total irradiance in each passband is then summed and divided by
the total irradiance between 290 nm and 400 nm.
b
The minimum and maximum limits given in this table are based on 21 spectral irradiance measurements with UVA-351
(type 1B) lamps from different production lots and of various ages. The spectral irradiance data are for lamps within the
ageing recommendations of the manufacturer of the apparatus. 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.
c
The minimum and maximum columns will not necessarily sum to 100 % because they represent the minima and
maxima for the measurement data used. For any individual spectral irradiance distribution, the percentages calculated
for the passbands in this table will sum to 100 %. For any individual UVA-351 (type 1B) fluorescent lamp, the calculated
percentage in each passband shall fall within the minimum and maximum limits given. Test results can be expected to differ
between exposures using UVA-351 (type 1B) lamps in which the spectral irradiance differs by as much as that allowed by the
tolerances. Contact the manufacturer of the fluorescent UV apparatus for specific spectral irradiance data for the type UVA-
351 (type 1B) lamp used.
d
The data from Table 4 of CIE No. 85:1989 plus the effect of window glass were determined by multiplying the data from
[[3]]
Table 4 of CIE No. 85:1989 by the spectral transmittance of typical 3 mm-thick window glass (see ISO 11341 ). These data
are provided for reference purposes only and are intended to serve as a target.
e
For the CIE No. 85:1989 Table 4 plus window glass data, the UV irradiance from 300 nm to 400 nm is typically about 9 %
and the visible irradiance (400 nm to 800 nm) is typically about 91 %, expressed as a percentage of the total irradiance from
300 nm to 800 nm. Because the primary emission of fluorescent UV lamps is concentrated in the 300 nm to 400 nm passband,
there are limited data available for the visible light emission of fluorescent UV lamps. The percentages of UV irradiance
and visible irradiance on specimens exposed in fluorescent UV apparatus may vary due to the number of specimens being
exposed and their reflectance properties.
4 © ISO 2013 – All rights reserved
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SIST EN ISO 4892-3:2014
ISO 4892-3:2013(E)
ab
Table 3 — Relative ultraviolet spectral irradiance for UVB-313 (type 2) lamps (method C)
c de c
Spectral passband Minimum CIE No. 85:1989, Table 4 Maximum
[λ = wavelength % % %
in nanometres (nm)]
λ < 290 1,3 0 5,4
290 ≤ λ ≤ 320 47,8 5,4 65,9
320 < λ ≤ 360 26,9 38,2 43,9
360 < λ ≤ 400 1,7 56,4 7,2
a
This table gives the irradiance in the given passband, expressed as a percentage of the total irradiance between 250 nm
and 400 nm. To determine whether a specific UVB-313 (type 2) lamp meets the requirements of this table, the spectral
irradiance from 250 nm to 400 nm shall be measured. The total irradiance in each passband is then summed and divided by
the total irradiance between 250 nm and 400 nm.
b
The minimum and maximum limits given in this table are based on 44 spectral irradiance measurements with UVB-313
[[2]]
(type 2) lamps from different production lots and of various ages. The spectral irradiance data are for lamps within the
ageing recommendations of the manufacturer of the apparatus. 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.
c
The minimum and maximum columns will not necessarily sum to 100 % because they represent the minima and
maxima for the measurement data used. For any individual spectral irradiance distribution, the percentages calculated
for the passbands in this table will sum to 100 %. For any individual UVB-313 (type 2) fluorescent lamp, the calculated
percentage in each passband shall fall within the minimum and maximum limits given. Test results can be expected to differ
between exposures using UVB-313 (type 2) lamps in which the spectral irradiance differs by as much as that allowed by
the tolerances. Contact the manufacturer of the fluorescent UV apparatus for specific spectral irradiance data for the type 2
lamp used.
d
The data from Table 4 of CIE Publication No. 85:1989 are the global solar irradiance on a horizontal surface for an air
mass of 1,0, an ozone column of 0,34 cm at STP, 1,42 cm of precipitable water vapour and a spectral optical depth of aerosol
extinction of 0,1 at 500 nm. These data are provided for reference purposes only.
e
For the solar spectrum represented by Table 4 of CIE No. 85:1989, the UV irradiance (290 nm to 400 nm) is 11 % and
the visible irradiance (400 nm to 800 nm) is 89 %, expressed as a percentage of the total irradiance from 290 nm to 800 nm.
Because the primary emission of fluorescent UV lamps is concentrated in the 300 nm to 400 nm passband, there are limited
data available for the visible light emission of fluorescent UV lamps. The percentages of UV ir
...
SLOVENSKI STANDARD
oSIST prEN ISO 4892-3:2011
01-junij-2011
Polimerni materiali - Metode izpostavljanja laboratorijskim virom svetlobe - 3. del:
Fluorescentne UV-svetilke (ISO/DIS 4892-3:2011)
Plastics - Methods of exposure to laboratory light sources - Part 3: Fluorescent UV lamps
(ISO/DIS 4892-3:2011)
Kunststoffe - Künstliches Bestrahlen oder Bewittern in Geräten - Teil 3: UV-
Leuchtstofflampen (ISO/DIS 4892-3:2011)
Plastiques - Méthodes d'exposition à des sources lumineuses de laboratoire - Partie 3:
Lampes fluorescentes UV (ISO/DIS 4892-3:2011)
Ta slovenski standard je istoveten z: prEN ISO 4892-3
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
oSIST prEN ISO 4892-3:2011 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 4892-3:2011
---------------------- Page: 2 ----------------------
oSIST prEN ISO 4892-3:2011
EUROPEAN STANDARD
DRAFT
prEN ISO 4892-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2011
ICS 83.080.01 Will supersede EN ISO 4892-3:2006
English Version
Plastics - Methods of exposure to laboratory light sources - Part
3: Fluorescent UV lamps (ISO/DIS 4892-3:2011)
Plastiques - Méthodes d'exposition à des sources Kunststoffe - Künstliches Bestrahlen oder Bewittern in
lumineuses de laboratoire - Partie 3: Lampes fluorescentes Geräten - Teil 3: UV-Leuchtstofflampen (ISO/DIS 4892-
UV (ISO/DIS 4892-3:2011) 3:2011)
This draft European Standard is submitted to CEN members for parallel enquiry. 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-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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
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
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN ISO 4892-3:2011: E
worldwide for CEN national Members.
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oSIST prEN ISO 4892-3:2011
prEN ISO 4892-3:2011 (E)
Contents Page
Foreword .3
2
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oSIST prEN ISO 4892-3:2011
prEN ISO 4892-3:2011 (E)
Foreword
This document (prEN ISO 4892-3:2011) 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 document is currently submitted to the parallel Enquiry.
This document will supersede EN ISO 4892-3:2006.
Endorsement notice
The text of ISO/DIS 4892-3:2011 has been approved by CEN as a prEN ISO 4892-3:2011 without any
modification.
3
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oSIST prEN ISO 4892-3:2011
DRAFT INTERNATIONAL STANDARD ISO/DIS 4892-3
ISO/TC 61/SC 6 Secretariat: DIN
Voting begins on Voting terminates on
2011-04-14 2011-09-14
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ ORGANISATION INTERNATIONALE DE NORMALISATION
Plastics — Methods of exposure to laboratory light sources —
Part 3:
Fluorescent UV lamps
Plastiques — Méthodes d'exposition à des sources lumineuses de laboratoire —
Partie 3: Lampes fluorescentes UV
[Revision of second edition (ISO 4892-3:2006)]
ICS 83.080.01
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for Standardization (ISO), and
processed under the ISO-lead mode of collaboration as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member bodies for a parallel
five-month enquiry.
Should this draft be accepted, a final draft, established on the basis of comments received, will be
submitted to a parallel two-month approval vote in ISO and formal vote in CEN.
In accordance with the provisions of Council Resolution 15/1993 this document is circulated in
the English language only.
Conformément aux dispositions de la Résolution du Conseil 15/1993, ce document est distribué
en version anglaise seulement.
To expedite distribution, this document is circulated as received from the committee
secretariat. ISO Central Secretariat work of editing and text composition will be undertaken at
publication stage.
Pour accélérer la distribution, le présent document est distribué tel qu'il est parvenu du
secrétariat du comité. Le travail de rédaction et de composition de texte sera effectué au
Secrétariat central de l'ISO au stade de publication.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME
STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
© International Organization for Standardization, 2011
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Copyright notice
This ISO document is a Draft International Standard and is copyright-protected by ISO. Except as permitted
under the applicable laws of the user’s country, neither this ISO draft nor any extract from it may be
reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic,
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Requests for permission to reproduce should be addressed to either ISO at the address below or ISO’s
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Reproduction may be subject to royalty payments or a licensing agreement.
Violators may be prosecuted.
ii © ISO 2011 – All rights reserved
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Contents Page
Foreword .iv
1 Scope.1
2 Normative references.1
3 Principle.1
4 Apparatus.2
5 Test specimens.6
6 Test conditions .6
7 Procedure.9
8 Exposure report.9
Annex A (informative) Spectral distribution of radiation for typical fluorescent UV lamps.10
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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.
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.
ISO 4892-3 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 6, Ageing,
chemical and environmental resistance.
This second edition cancels and replaces the first edition (ISO 4892-3:2006). The main technical changes are:
In Table 4, clear statement of irradiance
In Table 4, two exposure cycles are added
ISO 4892 consists of the following parts, under the general title Plastics — 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
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DRAFT INTERNATIONAL STANDARD ISO/DIS 4892-3
Plastics — Methods of exposure to laboratory light sources —
Part 3:
Fluorescent UV lamps
1 Scope
This part of ISO 4892 specifies methods for exposing specimens to fluorescent UV radiation, heat and water
in apparatus designed to simulate the weathering effects that occur when materials are exposed in actual end-
use environments to daylight, or to daylight through window glass.
The specimens are exposed to fluorescent UV lamps under controlled environmental conditions (temperature,
humidity and/or water). Different types of fluorescent UV lamp may be used to meet all the requirements for
testing different materials.
Specimen preparation and evaluation of the results are covered in other ISO documents for specific materials.
General guidance is given in ISO 4892-1.
[4]
NOTE Fluorescent UV lamp exposures for paints, varnishes and other coatings are described in ISO 11507 .
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 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
3 Principle
3.1 Fluorescent UV lamps, when following manufacturer’s recommendations for lamp maintenance and/or
rotation, can be used to simulate the spectral irradiance of daylight in the short wavelanght ultraviolet (UV)
region of the spectrum.
3.2 Specimens are exposed to various levels of UV radiation, heat and moisture (see 3.4) under controlled
environmental conditions.
3.3 The exposure conditions may be varied by selection of:
a) The type of fluorescent UV lamp.
b) The irradiance level.
c) The temperature during the UV exposure.
d) The relative humidity of the chamber air during the UV and dark exposures, when test conditions
requiring control of humidity are used.
NOTE Commercial fluorescent UV devices usually do not provide means of relative humidity control.
e) The type of wetting (see 3.4).
f) The wetting temperature and cycle.
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g) The timing of the UV/dark cycle.
3.4 Wetting is usually produced by condensation of water vapour onto the exposed specimen surface or by
spraying the test specimens with demineralized/deionized water.
3.5 The procedure(s) may include measurement of the irradiance and the radiant exposure in the plane of
the specimen.
3.6 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.
3.7 Intercomparison of results obtained from specimens exposed in different types of apparatus or to
different types of lamp should not be made unless an appropriate statistical relationship has been established
between the different types of equipment for the material to be tested.
4 Apparatus
4.1 Laboratory light source
4.1.1 Fluorescent UV lamps are fluorescent lamps in which radiant emission in the ultraviolet region of the
spectrum, i.e. below 400 nm, makes up at least 80 % of the total light output. There are three types of
fluorescent UV lamp used in this part of ISO 4892:
⎯ Type 1A (UVA-340) fluorescent UV lamp: These lamps have a radiant emission below 300 nm of less
than 2 % of the total light output, have an emission peak at 343 nm, and are more commonly identified as
UVA-340 for simulation of daylight from 300 nm to 340 nm (see Table 1, column A.1). Figure A.1 of
Annex A is a graph of spectral irradiance from 250 nm to 400 nm of a typical type 1A (UVA-340)
fluorescent lamp compared to daylight.
⎯ Type 1A lamp combination: If specified and agreed upon by all parties, a combination of fluorescent UV
lamps may also be used (see Table 1, column A.2). When combinations of lamps with different spectral
emissions are used, provision shall be made to ensure the uniformity of the spectral irradiance at the
surface of the specimens, e.g. by continuous repositioning of the specimens around the lamp array.
Figure A.4 of Annex A is a graph of spectral irradiance of a typical type type 1A UV lamp combination with
filter compared to daylight.
⎯ Type 1B (UVA-351) fluorescent UV lamp: These lamps have a radiant emission below 310 nm of less
than 2 % of the total light output, have a peak emission at 353 nm, and are more commonly identified as
UVA-351 for simulation of the UV portion of daylight behind window glass (see Table 2). Figure A.2 of
Annex A is a graph of spectral irradiance from 250 nm to 400 nm of a typical type 1B (UVA-351)
fluorescent UV lamp compared to daylight filtered by window glass.
⎯ Type 2 (UVB-313) fluorescent UV lamp: These lamps are more commonly identified as UVB-313 and
have a radiant emission below 300 nm that is more than 10 % of the total output and a peak emission at
313 nm (see Table 3). Figure A.3 of Annex A is a graph of the spectral irradiance from 250 nm to 400 nm
of two typical type 2 (UVB-313) fluorescent lamps compared to daylight. Type 2 (UVB-313) lamps may be
used only by agreement between the parties concerned. Such agreement shall be stated in the test
report.
NOTE 1 Type 2 (UVB-313) lamps have a spectral distribution of radiation which peaks near the 313 nm mercury line
and may emit radiation down to λ = 254 nm, which can initiate ageing processes that never occurs in end-use
environments.
NOTE 2 The solar spectral irradiance for a number of different atmospheric conditions is described in CIE Publication
[1]
No. 85 . The benchmark daylight used in this part of ISO 4892 is from Table 4 in CIE Publication No. 85:1989.
4.1.2 Unless otherwise specified, type 1A (UVA-340) fluorescent UV lamps or corresponding type 1A
fluorescent UV lamp combinations shall be used to simulate the UV part of daylight (see Table 4, method A).
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Unless otherwise specified, type 1B (UVA-351) lamps shall be used to simulate the UV part of daylight
through window glass (see Table 4, method B).
4.1.3 Fluorescent lamps age significantly with extended use. If an automatic irradiance control system is not
used, follow the apparatus manufacturer’s instructions on the procedure necessary to maintain the desired
irradiance.
4.1.4 Irradiance uniformity shall be in accordance with the requirements specified in ISO 4892-1.
Requirements for periodic repositioning of specimens when irradiance within the exposure area is less than
90 % of the peak irradiance are described in ISO 4892-1.
a, b
Table 1 — Relative ultraviolet spectral irradiance for type 1A lamps for daylight UV (method A)
Type 1A (UVA-340) lamp Type 1A lamp combination
A.1 A.2
Spectral passband
c c c c
(λ = wavelength in nm) Minimum CIE No. 85:1989, Maximum Minimum CIE No. 85:1989, Maximum
d,e d,e
Table 4 Table 4
% % % % % %
λ < 290 0 0,01 0 0
290 < λ < 320 5,9 5,4 9,3 4 5,4 7
320 < λ < 360 60,9 38,2 65,5 48 38,2 56
360 < λ < 400 26,5 56,4 32,8 38 56,4 46
a
This table gives the irradiance in the given passband, expressed as a percentage of the total irradiance between 290 nm and
400 nm. To determine whether a specific type 1A (UVA-340) lamp meets the requirements of this table, the spectral irradiance from
250 nm to 400 nm shall be measured. Typically, this is done in 2 nm increments. The total irradiance in each passband is then summed
and divided by the total irradiance between 290 nm and 400 nm.
b
The minimum and maximum limits for type 1A (UVA-340) lamps in this table are based on more than 60 spectral irradiance
[2]
measurements with type 1A (UVA-340) lamps from different production lots and of various ages . The spectral irradiance data are for
lamps within the ageing recommendations of the apparatus 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.
The range of the relative irradiance of type 1A lamp combinations is determined by radiation measurements at about 50 locations within
the exposure area recommended by the apparatus manufacturer.
c
The minimum and maximum columns will not necessarily sum to 100 % because they represent the minima and maxima for the
measurement data used. For any individual spectral irradiance distribution, the percentages calculated for the passbands in this table
will sum to 100 %. For any individual type 1A (UVA-340) fluorescent lamp, the calculated percentage in each passband shall fall within
the minimum and maximum limits given. Test results can be expected to differ between exposures using type 1A (UVA-340) lamps in
which the spectral irradiance differs by as much as that allowed by the tolerances. Contact the manufacturer of the fluorescent UV
apparatus for specific spectral irradiance data for the type 1A (UVA-340) lamp used.
d
The data from Table 4 in CIE Publication No. 85:1989 is the global solar irradiance on a horizontal surface for an air mass of 1,0,
an ozone column of 0,34 cm at STP, 1,42 cm of precipitable water vapour and a spectral optical depth of aerosol extinction of 0,1 at
500 nm. These data are provided for reference purposes only and are intended to serve as a target.
e
For the solar spectrum represented by Table 4 in CIE No. 85:1989, the UV irradiance (290 nm to 400 nm) is 11 % and the visible
irradiance (400 nm to 800 nm) is 89 %, expressed as a percentage of the total irradiance from 290 nm to 800 nm. Because the primary
emission of fluorescent UV lamps is concentrated in the 300 nm to 400 nm passband, there are limited data available for the visible light
emission of fluorescent UV lamps. The percentages of UV irradiance and visible irradiance on specimens exposed in fluorescent UV
apparatus may vary due to the number of specimens being exposed and their reflectance properties.
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Table 2 — Relative ultraviolet spectral irradiance for type 1B (UVA-351) lamps for daylight behind
a, b
window glass (method B)
c c
Spectral passband Minimum CIE No. 85:1989, Table 4, Maximum
d,e
(λ = wavelength in nm) plus effect of window glass
% % %
λ < 300 0 0,2
300 < λ ≤ 320 1,1 ≤ 1 3,3
320 < λ ≤ 360 60,5 33,1 66,8
360 < λ ≤ 400 30,0 66,0 38,0
a
This table gives the irradiance in the given passband, expressed as a percentage of the total irradiance between 290 nm and
400 nm. To determine whether a specific type 1B (UVA-351) lamp meets the requirements of this table, the spectral irradiance from
250 nm to 400 nm shall be measured. The total irradiance in each passband is then summed and divided by the total irradiance
between 290 nm and 400 nm.
b
The minimum and maximum limits given in this table are based on 21 spectral irradiance measurements with type 1B (UVA-351)
[2]
lamps from different production lots and of various ages . The spectral irradiance data are for lamps within the ageing
recommendations of the apparatus 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.
c
The minimum and maximum columns will not necessarily sum to 100 % because they represent the minima and maxima for the
measurement data used. For any individual spectral irradiance distribution, the percentages calculated for the passbands in this table
will sum to 100 %. For any individual type 1B (UVA-351) fluorescent lamp, the calculated percentage in each passband shall fall within
the minimum and maximum limits given. Test results can be expected to differ between exposures using type 1B (UVA-351) lamps in
which the spectral irradiance differs by as much as that allowed by the tolerances. Contact the manufacturer of the fluorescent UV
apparatus for specific spectral irradiance data for the type 1B (UVA-351) lamp used.
d
The data from Table 4 in CIE No. 85:1989 plus the effect of window glass was determined by multiplying the CIE No. 85:1989
[3]
Table 4 data by the spectral transmittance of typical 3-mm-thick window glass (see ISO 11341 ). These data are provided for
reference purposes only and are intended to serve as a target.
e
For the CIE No. 85:1989 Table 4 plus window glass data, the UV irradiance from 300 nm to 400 nm is typically about 9 % and the
visible irradiance (400 nm to 800 nm) is typically about 91 %, expressed as a percentage of the total irradiance from 300 nm to 800 nm.
Because the primary emission of fluorescent UV lamps is concentrated in the 300 nm to 400 nm passband, there are limited data
available for the visible light emission of fluorescent UV lamps. The percentages of UV irradiance and visible irradiance on specimens
exposed in fluorescent UV apparatus may vary due to the number of specimens being exposed and their reflectance properties.
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a, b
Table 3 — Relative ultraviolet spectral irradiance for type 2 (UVB-313) lamps (method C)
c d, e c
Spectral passband Minimum CIE No. 85:1989, Table 4 Maximum
(λ = wavelength in nm)
% % %
λ < 290 1,3 0 5,4
290 < λ ≤ 320 47,8 5,4 65,9
320 < λ ≤ 360 26,9 38,2 43,9
360 < λ ≤ 400 1,7 56,4 7,2
a
This table gives the irradiance in the given passband, expressed as a percentage of the total irradiance between 250 nm and
400 nm. To determine whether a specific type 2 (UVB-313) lamp meets the requirements of this table, the spectral irradiance from
250 nm to 400 nm shall be measured. The total irradiance in each passband is then summed and divided by the total irradiance
between 250 nm and 400 nm.
b
The minimum and maximum limits given in this table are based on 44 spectral irradiance measurements with type 2 (UVB-313)
[2]
lamps from different production lots and of various ages . The spectral irradiance data are for lamps within the ageing
recommendations of the apparatus 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.
c
The minimum and maximum columns will not necessarily sum to 100 % because they represent the minima and maxima for the
measurement data used. For any individual spectral irradiance distribution, the percentages calculated for the passbands in this table
will sum to 100 %. For any individual type 2 (UVB-313) fluorescent lamp, the calculated percentage in each passband shall fall within
the minimum and maximum limits given. Test results can be expected to differ between exposures using type 2 (UVB-313) lamps in
which the spectral irradiance differs by as much as that allowed by the tolerances. Contact the manufacturer of the fluorescent UV
apparatus for specific spectral irradiance data for the type 2 lamp used.
d
The data from Table 4 in CIE Publication No. 85:1989 is the global solar irradiance on a horizontal surface for an air mass of 1,0,
an ozone column of 0,34 cm at STP, 1,42 cm of precipitable water vapour and a spectral optical depth of aerosol extinction of 0,1 at
500 nm. These data are provided for reference purposes only.
e
For the solar spectrum represented by Table 4 in CIE No. 85:1989, the UV irradiance (290 nm to 400 nm) is 11 % and the visible
irradiance (400 nm to 800 nm) is 89 %, expressed as a percentage of the total irradiance from 290 nm to 800 nm. Because the primary
emission of fluorescent UV lamps is concentrated in the 300 nm to 400 nm passband, there are limited data available for the visible light
emission of fluorescent UV lamps. The percentages of UV irradiance and visible irradiance on specimens exposed in fluorescent UV
apparatus may vary due to the number of specimens being exposed and their reflectance properties.
4.2 Test chamber
The design of the exposure chamber may vary, but it shall be constructed from inert material and provide
uniform irradiance in conformance with ISO 4892-1, with means for controlling the temperature. When
required, provision shall be made for the formation of condensate or for spraying water onto the exposed
faces of the specimens, or for controlling the humidity in the exposure chamber.
4.3 Radiometer
The use of a radiometer for irradiance control is recommended. If a radiometer is used, it shall conform to the
requirements given in ISO 4892-1. If an automatic irradiance control system is not used, follow the apparatus
manufacturer’s instructions on the procedure necessary to maintain the desired irradiance.
4.4 Black-standard/black-panel thermometer
The black-standard or black-panel thermometer used shall comply with the requirements for these devices
that are given in ISO 4892-1.
4.5 Wetting and humidity
4.5.1 General
Specimens may be exposed to moisture in the form of condensation or water spray. Specific test conditions
describing the use of condensation or water spray are described in Table 4. If condensation or water spray is
utilized, the specific procedures and exposure conditions used shall be included in the test report.
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Table 4 describes various test conditions where relative humidity is controlled and where humidity control is
not required.
NOTE The duration of the condensation or water spray period, or the relative humidity of the air, may have a
significant influence on the photodegradation of polymers.
4.5.2 Relative humidity control equipment
The relative humidity may be controlled during the exposure. For tests where relative humidity control is
requir
...
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