ISO 16053-2:2024
(Main)Paints and varnishes — Coating materials and coating systems for exterior wood — Part 2: Exposure of wood coatings to artificial weathering using fluorescent UV lamps and water
Paints and varnishes — Coating materials and coating systems for exterior wood — Part 2: Exposure of wood coatings to artificial weathering using fluorescent UV lamps and water
This document specifies a method for determining the resistance of wood coatings to artificial weathering performed in an apparatus equipped with fluorescent UV lamps, condensation and water spray devices.
Peintures et vernis — Produits de peinture et systèmes de peinture pour bois en extérieur — Partie 2: Vieillissement artificiel des revêtements pour bois par exposition à des lampes UV fluorescentes et à de l'eau
General Information
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Standards Content (Sample)
International
Standard
ISO 16053-2
First edition
Paints and varnishes — Coating
2024-03
materials and coating systems for
exterior wood —
Part 2:
Exposure of wood coatings
to artificial weathering using
fluorescent UV lamps and water
Peintures et vernis — Produits de peinture et systèmes de
peinture pour bois en extérieur —
Partie 2: Vieillissement artificiel des revêtements pour bois par
exposition à des lampes UV fluorescentes et à de l'eau
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principle . 2
5 Apparatus . 2
5.1 Test chamber .2
5.2 Lamps . .2
5.3 Device for wetting the test panels.2
5.4 Black panel thermometer .2
5.5 Irradiance control .3
6 Test panels . 3
6.1 Wood .3
6.2 Preparation and selection of wood panels.4
6.3 Preparation of coated panels .4
6.3.1 Wood conditioning.4
6.3.2 Preparation of panels for the test coating .4
6.3.3 Conditioning .5
7 Procedure . 5
7.1 Examination before exposure .5
7.2 Mounting the test panels .5
7.3 Exposure .5
7.3.1 Exposure cycle .5
7.3.2 Sample rotation and maintenance .6
7.3.3 Duration of test .6
7.4 Examination of test panels .6
8 Precision . 6
9 Expression of results and test report . 9
Annex A (normative) Details of the test methods . 10
Annex B (informative) Explanatory notes .12
Annex C (normative) Test for heartwood in pine.13
Annex D (informative) Water purification . 14
Annex E (normative) Test for abnormally porous wood .15
Annex F (informative) Alternative procedure for preparation and coating of panels .16
Annex G (informative) Determination of adhesive strength of tape on test surface. 17
Bibliography .18
iii
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
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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 document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
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patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
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Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by the European Committee for Standardization (CEN) (as EN 927-6:2018) and
was adopted, without modification other than those given below. It was assigned to Technical Committee
ISO/TC 35, Paints and varnishes, Subcommittee SC 9, General test methods for paints and varnishes and
adopted under the "fast-track procedure".
— added CIE 1964 and CIE 1976 as normative references in Clause 2;
— removed redundant UVA-340 peak emission specification from 5.2;
— citation of Annex E added in 6.1;
— text below Figure 1 has been made into a Note;
— changed “mesh” to “grit” in 6.3.2;
— added a bibliography reference to the SERVOWOOD project in Clause 8;
— changed “may” to “can” in Clause 8 to indicate the possibility of the test precision to vary, rather than a
permission;
— updated symbols and units and added a Note in Table 2;
— updated symbols in A.1;
— changed “guidance” to “instructions” in A.8.2.2;
— updated grammar in B.2 to improve clarity;
— removed hypothetical statement for testing other wood species from B.4;
— changed the status of Annex C from informative to normative;
— updated the title of Annex D;
— clarified the tape strength procedure in Annex G.
iv
A list of all parts in the ISO 16053 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
v
Introduction
Coatings from paints, varnishes and similar materials are weathered in a laboratory in order to accelerate
ageing processes (caused by temperature, wetness and irradiation) which occur during natural weathering.
Generally, a simple accelerating ratio between ageing during artificial and natural weathering cannot be
expected due to the influencing factors having different effects according to the nature of the coating and
substrate. Predictable relationships can only be expected if the effect of the important parameters (spectral
distribution of the irradiance in the photochemically relevant range, temperature of the specimen, type of
wetting, wetting cycle relative humidity) on the coating is known. Moreover, acceleration of the coating
chemistry can cause alternative degradation pathways to be followed. However, unlike natural weathering,
testing in the laboratory can be controlled by the operator and therefore the results are more repeatable
and reproducible. This document incorporates the results of a precision investigation that quantifies the
capability of the test in terms of repeatability and reproducibility.
vi
International Standard ISO 16053-2:2024(en)
Paints and varnishes — Coating materials and coating
systems for exterior wood —
Part 2:
Exposure of wood coatings to artificial weathering using
fluorescent UV lamps and water
1 Scope
This document specifies a method for determining the resistance of wood coatings to artificial weathering
performed in an apparatus equipped with fluorescent UV lamps, condensation and water spray devices.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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 554, Standard atmospheres for conditioning and/or testing — Specifications
ISO 2409, Paints and varnishes — Cross-cut test
ISO 2813, Paints and varnishes — Determination of gloss value at 20°, 60° and 85°
ISO 4618, Paints and varnishes — Vocabulary
ISO 4628-1:2016, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size
of defects, and of intensity of uniform changes in appearance — Part 1: General introduction and designation system
ISO 4628-2, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of
defects, and of intensity of uniform changes in appearance — Part 2: Assessment of degree of blistering
ISO 4628-4, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of
defects, and of intensity of uniform changes in appearance — Part 4: Assessment of degree of cracking
ISO 4628-5, Paints and varnishes — Evaluation of quantity and size of defects, and of intensity of uniform
changes in appearance — Part 5: Assessment of degree of flaking
ISO 4628-6, Paints and varnishes — Evaluation of degradation of coatings — Designation of quantity and size of
defects, and of intensity of uniform changes in appearance — Part 6: Assessment of degree of chalking by tape method
ISO 16474-3, Paints and varnishes — Methods of exposure to laboratory light sources — Part 3: Fluorescent UV lamps
ISO 18314-1, Analytical colorimetry — Part 1: Practical colour measurement
EN 927-1, Paints and varnishes — Coating materials and coating systems for exterior wood — Part 1:
Classification and selection
CIE 1964, (U*, V*, W*) color space (CIEUVW)
CIE 1976, L*, u*, v* color space (CIELUV)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle
Artificial weathering of coatings using fluorescent UV lamps, condensation or water spray is carried out in
order to produce a certain radiant exposure or mutually agreed total number of operation hours, based on a
given degree of a change in a property or properties. The properties of the exposed coatings are compared
with those of unexposed coatings, which are prepared from the same coating materials under identical
conditions or with coatings whose degradation properties are known.
Radiation, temperature and humidity all contribute to the ageing process. Therefore, the apparatus specified
in this document simulates all three factors.
The results obtained by this method do not necessarily directly relate to the results obtained under natural
exposure conditions. The relationship between these results shall be established before the method can be
used to predict performance. See B.3 for further explanations on correlation to natural weathering.
The standard test substrate is pine sapwood with the back side of panels coated. However, supplementary
information on coating performance may be obtained by conducting optional tests on additional wood
species, on pine, modified or impregnated by industrial processes or without coating the back side of the
panels. See B.4 for further explanations on wood species.
5 Apparatus
5.1 Test chamber
The test chamber consists of an enclosure made from corrosion-resistant material which houses the lamps,
a heated water tray, spray nozzles and test panel racks.
5.2 Lamps
An UV lamp emits UV radiation from a low-pressure mercury arc. The required spectral distribution is
achieved by 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.
NOTE The principal construction details are described in ISO 16474-1.
The lamp shall be of type UVA 340 in accordance with ISO 16474-3.
5.3 Device for wetting the test panels
The test panels shall be wetted by condensation from the heated water tray and by spray. To prevent spotting
on to the test panels, water with a pH value between 5,0 and 7,5 and an electrical conductivity of maximum
2 mS/m, measured at (25 ± 1) °C shall be used. See Annex D.
5.4 Black panel thermometer
Set the apparatus to operate at the specified parameters. The temperature shall be monitored by a remote
sensor attached to the black panel. The black panel thermometer shall be exposed to the same exposure
conditions as the specimens. Black panel thermometers shall be calibrated in accordance with the
manufacturer’s recommendations.
NOTE The construction of the black panel thermometer is described in ISO 16474-1.
5.5 Irradiance control
The irradiance at 340 nm shall be set to 0,89 W/(m ·nm) (see 7.3.1).
Apparatus equipped with an irradiance control system shall be calibrated in accordance with the
manufacturer’s recommendations.
Lamps within the apparatus without an irradiance control system shall be rotated and replaced in
accordance with the manufacturer’s recommendations to compensate for lamp ageing.
6 Test panels
6.1 Wood
The wood shall be Scots Pine (Pinus sylvestris) that has been selected free of knots, cracks and resinous
streaks, to be straight-grained and of normal growth rate (i.e. 3 to 8 annual rings per 10 mm). The inclination
of the growth rings to the face shall be 5° to 45° (see Figure 1 a, c, and d).
The wood shall be free from blue stain and evidence of surface or bulk fungal infection. Abnormal porosity
(caused by bacterial attack) shall be avoided. The procedure in Annex E shall be used to test for abnormal
porosity.
The panels shall be selected to give a sapwood test surface on the convex side of the growth rings, with no
heartwood (if present), closer than 10 mm to the test surface (see Figure 1b). If the presence of heartwood in
the selected pine cannot be detected by a difference in the colour in the wood, it shall be checked using the
test described in Annex C.
The wood shall be conditioned at (20 ± 2) °C and a relative humidity of (65 ± 5) %, in accordance with
ISO 554, to constant mass.
Key
a) Example of a panel fulfilling the demands of growth ring orientation (5° to 45°) at the front side. No heartwood is
closer than 10 mm to the test surface
b) This panel does not meet the specification because the heartwood is too close to the front side
c) This panel does not meet the specification because the growth ring orientation is not within the (5° to 45°) band. The
growth rings incline at −10° on the left of the panel and 30° on the right. Consequently, a part of the surface contains
a tangentially cut wood surface (gro
...
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