EN ISO 11341:2004

SLOVENSKI STANDARD
01-april-2005
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SIST EN ISO 11341:1998
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Paints and varnishes - Artificial weathering and exposure to artificial radiation - Exposure
to filtered xenon-arc radiation (ISO 11341:2004)
Beschichtungsstoffe - Künstliches Bewittern und künstliches Bestrahlen -
Beanspruchung durch gefilterte Xenonbogenstrahlung (ISO 11341:2004)
Peintures et vernis - Vieillissement artificiel et exposition au rayonnement artificiel -
Exposition au rayonnement filtré d'une lampe a arc au xénon (ISO 11341:2004)
Ta slovenski standard je istoveten z: EN ISO 11341:2004
ICS:
87.040 Barve in laki Paints and varnishes
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 11341
Second edition
2004-09-01
Paints and varnishes — Artificial
weathering and exposure to artificial
radiation — Exposure to filtered
xenon-arc radiation
Peintures et vernis — Vieillissement artificiel et exposition au
rayonnement artificiel — Exposition au rayonnement filtré d'une lampe
à arc au xénon
Reference number
ISO 11341:2004(E)
©
ISO 2004
ISO 11341:2004(E)
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ii © ISO 2004 – All rights reserved

ISO 11341:2004(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 1
4 Principle. 2
5 Required supplementary information. 3
6 Apparatus. 3
7 Sampling. 7
8 Preparation of test panels. 7
9 Procedure. 8
10 Evaluation of ageing behaviour. 10
11 Test report. 10
Annex A (normative) Required supplementary information . 12
Annex B (informative) Global solar spectral irradiance and spectral transmittance of window
glass . 13
Bibliography . 16

ISO 11341:2004(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 11341 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 9,
General test methods for paints and varnishes.
This second edition cancels and replaces the first edition (ISO 11341:1994), which has been revised both
technically and editorially. It also replaces ISO 2809:1976.
The main technical changes compared to ISO 11341:1994 are:
a) Tables 1 and 2: The spectral irradiance distribution tables have been recalculated from the previous
wavelength range of 300 nm to 800 nm to a wavelength range of 300 nm to 400 nm. New tolerances
have been introduced based on spectral irradiance measurements made with typical xenon-arc
instruments. In Table 2, the central values have been corrected using Table B.1 and B.2.
b) Subclause 6.2: The required irradiance values have been recalculated from the previous wavelength
range of 300 nm to 800 nm to a wavelength range of 300 nm to 400 nm. Additionally, narrow-band
spectral irradiance values at 320 nm and 420 nm have been included.
c) Subclause 6.2: An option for using high irradiance levels (up to about three times that of the sun) has
been included.
d) Subclauses 6.6 and 9.2: Both black-standard and black-panel thermometers are now included.
e) Subclause 9.3: The test-chamber air temperature is now specified.
f) Table 3: The values of the relative humidity in cycles A and B have been harmonized with those in
cycles C and D.
g) Clause 9.5: An additional wetting/drying cycle has been included for special applications.

iv © ISO 2004 – All rights reserved

ISO 11341:2004(E)
Introduction
Coatings of paints, varnishes and similar materials (subsequently referred to simply as coatings) are exposed
to artificial weathering, or to artificial radiation, in order to simulate in the laboratory the ageing processes
which occur during natural weathering or during exposure tests under glass cover.
In contrast to natural weathering, artificial weathering involves a limited number of variables which can be
controlled more readily and which can be intensified to produce accelerated ageing.
The ageing processes which occur during artificial and natural weathering cannot be expected to correlate
with each other because of the large number of factors which influence these processes. Definite relationships
can only be expected if the important parameters (distribution of the irradiance over the photochemically
relevant part of the spectrum, temperature of the specimen, type of wetting and wetting cycle, and relative
humidity) are the same in each case or if their effect on the coatings is known.

INTERNATIONAL STANDARD ISO 11341:2004(E)

Paints and varnishes — Artificial weathering and exposure to
artificial radiation — Exposure to filtered xenon-arc radiation
1 Scope
This International Standard specifies a procedure for exposing paint coatings to artificial weathering in xenon-
arc lamp apparatus, including the action of liquid water and water vapour. The effects of this weathering are
evaluated separately by comparative determination of selected parameters before, during and after
weathering.
The standard describes the most important parameters and specifies the conditions to be used in the
exposure apparatus.
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 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 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning and
testing
ISO 15528, Paints, varnishes and raw materials for paints and varnishes — Sampling
CIE Publication No. 85:1989, Solar spectral irradiance
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
ageing behaviour
change in the properties of a coating during weathering or exposure to radiation
NOTE One measure of ageing is the radiant exposure H in the wavelength range below 400 nm or at a specified
wavelength, e.g. 340 nm. The ageing behaviour of coatings exposed to artificial weathering, or to artificial radiation,
depends on the type of coating, the conditions of exposure of the coating, the property selected for monitoring the
progress of the ageing process and the degree of change of this property.
ISO 11341:2004(E)
3.2
radiant exposure
H
amount of radiant energy to which a test panel has been exposed, given by the equation
H = Etd
∫
where
E is the irradiance, in watts per square metre;
t is the exposure time, in seconds
NOTE 1 H is therefore expressed in joules per square metre.
NOTE 2 If the irradiance E is constant throughout the whole exposure time, the radiant exposure H is given simply by
the product of E and t.
3.3
ageing criterion
given degree of change in a selected property of the coating under test
NOTE The ageing criterion is specified or agreed upon.
4 Principle
Artificial weathering of coatings or exposure of coatings to filtered xenon-arc radiation is carried out in order to
obtain the degree of change in a selected property after a certain radiant exposure H, and/or the radiant
exposure which is required to produce a certain degree of ageing. The properties selected for monitoring
should preferably be those which are important for the practical use of the coatings. The properties of the
coatings exposed are compared with those of unexposed coatings prepared from the same coating materials
at the same time and in the same way (control specimens) or with those of coatings exposed at the same time
whose behaviour during testing in exposure apparatus is already known (reference specimens).
During natural weathering, solar radiation is considered to be the essential cause for the ageing of coatings.
The same is valid for exposure to radiation under glass. Therefore, in artificial weathering and exposure to
artificial radiation, particular importance is attached to the simulation of this parameter. The xenon-arc
radiation source used is therefore fitted with one of two different filter systems, designed to modify the spectral
distribution of the radiation produced so that, with one of the filters, it matches the spectral distribution, in the
ultraviolet and visible regions, of global solar radiation (method 1) and, with the other filter, it matches the
spectral distribution, in the ultraviolet and visible regions, of global solar radiation filtered by 3-mm-thick
window glass (method 2).
Two spectral energy distributions are used to describe the irradiance values and permitted deviations of the
filtered test radiation in the ultraviolet range below 400 nm. In addition, CIE Publication No. 85 is used for the
specification of the irradiance in the range up to 800 nm because only in that range can the xenon-arc
radiation be adapted to match solar radiation sufficiently well.
During testing in exposure apparatus, the spectral irradiance E may change due to
...