INTERNATIONAL ISO

STANDARD 11507

Second edition
2007-02-01

Paints and varnishes — Exposure of

coatings to artificial weathering —
Exposure to fluorescent UV lamps and
water
Peintures et vernis — Exposition des revêtements au vieillissement
artificiel — Exposition au rayonnement de lampes à fluorescence UV et
à l'eau
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ISO 11507:2007
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Reference number
ISO 11507:2007(E)

© ISO 2007
ISO 11507:2007(E)

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Contents Page

Foreword............................................................................................................................................................ iv
Introduction ........................................................................................................................................................ v
1 Scope ......................................................................................................................................................1
2 Normative references ............................................................................................................................1
3 Terms and definitions ...........................................................................................................................1
4 Principle..................................................................................................................................................2
5 Apparatus ...............................................................................................................................................3
6 Sampling .................................................................................................................................................6
7 Test panels .............................................................................................................................................6
8 Procedure ...............................................................................................................................................7
9 Calibration ..............................................................................................................................................8
10 Examination of test panels (ageing criteria) .......................................................................................8
11 iTeh STANDARD PREVIEW
Precision .................................................................................................................................................8
12 (standards.iteh.ai)
Supplementary test conditions ............................................................................................................8
13 Test report ..............................................................................................................................................9
ISO 11507:2007
Bibliography ......................................................................................................................................................10
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ISO 11507:2007(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.

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 11507 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9,
General test methods for paints and varnishes.
iTeh STANDARD PREVIEW
This second edition cancels and replaces the first edition (ISO 11507:1997), which has been technically
revised. The main changes are: (standards.iteh.ai)
⎯ the data on the lamps (tables in 5.1.2) have been harmonized with the data given in ISO 4892-3;
ISO 11507:2007
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⎯ the purity of the water for wetting the test panels has been changed from grade 2 to grade 3;
2aba9ecee558/iso-11507-2007
⎯ conditioning of the coated test panels prior to testing has been deleted.

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 ISO 11507:2007(E)

Introduction
Coatings from paints, varnishes and similar materials are weathered in the laboratory, in order to simulate
ageing processes occurring during natural weathering. Generally, valid correlations between ageing during
artificial and natural weathering cannot be expected because of the large number of influencing factors. Certain
relationships can only be expected if the effect of the important parameters (spectral distribution of the irradiance
in their photochemically relevant range, temperature of the specimen, type of wetting, wetting cycle relative
humidity) on the coating is known. However, unlike natural weathering, testing in the laboratory is carried out
taking into consideration a limited number of variables which can be controlled and therefore the results are
more reproducible.

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INTERNATIONAL STANDARD ISO 11507:2007(E)

Paints and varnishes — Exposure of coatings to artificial

weathering — Exposure to fluorescent UV lamps and water

1 Scope
This International Standard specifies exposure conditions for paint coatings exposed to artificial weathering in
apparatus including fluorescent UV lamps and condensation or water spray. The effects of weathering are
evaluated separately by comparative testing of chosen parameters.

NOTE The ultraviolet light produced by fluorescent lamps simulates only part of the UV region of natural sunlight and,
consequently, the test pieces are subjected to a small but destructive portion of the spectrum.

Due to the lack of visible and infra-red energy in the light from such UV lamps compared to sunlight, the test
pieces are not heated above the temperature of the surrounding air in the way in which they would be in
practical use.

2
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Normative references
(standards.iteh.ai)
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
ISO 11507:2007
document (including any amendments) applies.
https://standards.iteh.ai/catalog/standards/sist/27e79e03-4cb7-406c-a2fa-
2aba9ecee558/iso-11507-2007
ISO 1513, Paints and varnishes — Examination and preparation of samples for testing

ISO 1514, Paints and varnishes — Standard panels for testing

ISO 2808, Paints and varnishes — Determination of film thickness

ISO 3696:1987, Water for analytical laboratory use — Specification and test methods

ISO 4892-1:1999, Plastics — Methods of exposure to laboratory light sources — Part 1: General guidance

ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1
ageing criterion
given degree of change in a selected property of the coating under test

NOTE The ageing criterion is specified or agreed upon.

[ISO 11341:2004]

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ISO 11507:2007(E)

3.2
ageing behaviour
change in the properties of a coating during weathering or exposure to radiation

[ISO 11341:2004]

NOTE One measure of ageing is the radiant exposure below 400 nm or the radiant exposure at a specific wavelength
that is necessary to cause a specific property change.

3.3
irradiance
E
radiant flux/area for a specified wavelength range, expressed in watts per square metre

3.4
radiant exposure
H
amount of radiant energy to which a test panel has been exposed, given by the equation

∫
H = E dt

where

E is the irradiance, in watts per square metre;

t iTeh STANDARD PREVIEW

is the exposure time, in seconds.

NOTE 1
(standards.iteh.ai)
H is therefore expressed in joules per square metre.

NOTE 2 If the irradiance E is constant throughout the whole ISO 11507:2007

exposure time, the radiant exposure H is given simply by
the product of E and t. https://standards.iteh.ai/catalog/standards/sist/27e79e03-4cb7-406c-a2fa-
2aba9ecee558/iso-11507-2007
[ISO 11341:2004]

4 Principle
Artificial weathering of coatings using fluorescent UV lamps and condensation or water spray is carried out in
order to produce a certain radiant exposure or mutually agreed total number of operation hours and a given
degree of a change in a property or properties.

The properties of the exposed coatings are compared with those of unexposed coatings, prepared from the
same coating materials under identical conditions, or with coatings whose degradation properties are known.
These properties are evaluated in accordance with criteria agreed in advance between the interested parties.

Radiation, temperature and humidity all contribute to the ageing process. Therefore, apparatus specified in
this International Standard simulates all three factors.

The results obtained by the use of this method do not necessarily relate directly to the results obtained under
natural exposure conditions. The relationship between these results needs to be established before the
method can be used to predict performance. Different chemical behaviour can result in a different correlation
between accelerated weathering and natural weathering.

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5 Apparatus

5.1 Test chamber

5.1.1 General

The test chamber consists essentially of a conditioned enclosure, made from corrosion-resistant material, in
which are housed the lamps, a heated water-tray or spray nozzles and test panel racks.

5.1.2 Lamps

UV lamps emit UV light from a low-pressure mercury arc. The required spectral distribution is achieved by a
careful selection of the type of phosphor coating on the inner surface of the lamp and the nature of the glass
used in the construction of the tubes.

Unless otherwise specified, the lamp shall be one of the three types listed below:

Type I: This lamp emits a significant amount of radiation at wavelengths below 300 nm which is not present in
the sun's radiation. Some lamps of this type have a measurable emittance at the 254 nm mercury line. Due to
the higher quantum energy of this radiation, photochemical ageing processes can be initiated which do not
take place in natural weathering. Therefore, this type of fluorescent lamp should be used only when specially
agreed between the parties concerned.

This lamp, commonly called UVB-313, has a peak emission at 313 nm and the relative spectral irradiance
given in Table 1. iTeh STANDARD PREVIEW
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Table 1 — Relative ultraviolet spectral irradiance for UVB-313 lamps a,b

c
Spectral passband Minimum cISO 11507:2007 CIE No. 85:1989, Table 4 d,e Maximum
(λ = wavelength in nm)
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% % %
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λ < 290 1,3 0 5,4
290 u λ u 320 47,8 5,4 65,9
320 < λ u 360 26,9 38,2 43,9
360 < λ u 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 I (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 I (UVB-313)
lamps from different production lots and of various ages [18]. 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 I (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 I (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 I (UVB-313) 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 can vary due to the number of specimens being exposed and their reflectance properties.

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