ISO 11617:2022

INTERNATIONAL ISO
STANDARD 11617
Second edition
2022-01
Building and civil engineering
sealants — Determination of changes
in cohesion and appearance of
elastic weatherproofing sealants
after exposure of statically cured
specimens to artificial weathering and
mechanical cycling
Reference number
© ISO 2022
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
5.1 Support . 2
5.2 Spacers . 2
5.3 Backing material (bond breaker). 3
5.4 Separators . 3
5.5 Container . 4
5.6 Ventilated convection-type oven . 4
5.7 Fully automated test chamber with an artificial light source . 4
5.8 Artificial light source . 4
5.8.1 General . 4
5.8.2 Xenon-arc light source (default) . 5
5.8.3 Fluorescent ultraviolet source (option) . 5
5.8.4 Open-flame carbon arc source (option) . 5
5.9 Black standard (insulated) and black panel (uninsulated) temperature sensors . 5
5.10 Measuring tools . 5
6 Preparation of test specimens . 5
7 Conditioning . 6
7.1 General . 6
7.2 Method A (default) . 6
7.3 Method B (option) . 6
8 Test conditions .6
8.1 Test conditions of artificial weathering . 6
8.1.1 Test conditions of xenon-arc lamps device. 6
8.1.2 Test conditions of fluorescent UV lamps device . 7
8.1.3 Test conditions of open-flame carbon arc lamps device . 7
8.2 Mechanical cycling . 8
8.3 Degradation cycles . 8
9 Test procedure .8
10 Examination for defects . 9
10.1 General . 9
10.2 Sections through sealant test specimen . 9
10.3 Rating for cohesive cracks in zone C . 10
11 Photo documentation of test specimens .12
12 Test report .13
Annex A (informative) Engineering drawing of anodized aluminium support assembly .15
Annex B (informative) The reference size of the separator .16
Bibliography .18
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
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www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 59, Buildings and civil engineering works,
Subcommittee SC 8, sealants.
This second edition cancels and replaces the first edition (ISO 11617:2014), which has been technically
revised.
The main changes are as follows:
— this document has been updated and restructured for easier access to the relevant information.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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iv
INTERNATIONAL STANDARD ISO 11617:2022(E)
Building and civil engineering sealants — Determination
of changes in cohesion and appearance of elastic
weatherproofing sealants after exposure of statically cured
specimens to artificial weathering and mechanical cycling
1 Scope
This document specifies laboratory exposure procedures for determining the effects of cyclic movement
and artificial weathering on cured, elastic weatherproofing joint sealants (one- or multi-component).
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 4892-1:2016, Plastics — Methods of exposure to laboratory light sources — Part 1: General guidance
ISO 4892-2:2013, Plastics — Methods of exposure to laboratory light sources — Part 2: Xenon-arc lamps
ISO 4892-3:2016, Plastics — Methods of exposure to laboratory light sources — Part 3: Fluorescent UV
lamps
ISO 4892-4:2013, Plastics — Methods of exposure to laboratory light sources — Part 4: Open-flame carbon-
arc lamps
ISO 6927, Building and civil engineering sealants — Vocabulary
CIE 085-1989, Solar spectral irradiance
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6927 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
Test specimens are prepared in which the sealant to be tested adheres to two parallel support surfaces
(substrates). The specimens are conditioned statically (no movement) in a controlled climate. The
conditioned specimens (in their extended/compressed state) are exposed to repetitive degradation
cycles of artificial weathering (light, heat and moisture) and cyclic movement under controlled
environmental conditions. Within each cycle, weathering is carried out for six weeks in an artificial
weathering machine. After completion of each degradation cycle (each lasting six weeks), the specimens
(in their extended/compressed state) are visually examined for changes in appearance, cohesion and
adhesion of the sealant beads. The rating for quantity, width and depth of cohesive cracks for a specific
extension/compression value achieved along the length of the specimen as well as the depth, length and
range of any very significant loss of cohesion or adhesion (defined as > 3 mm crack depth) is determined;
and the general condition of the sealant is reported. The weathering and mechanical cycling exposure
and the examination for failures constitute a degradation cycle; and the degradation cycle is repeated 3
times (default value) or repeated as often as desired to achieve a certain exposure.
5 Apparatus
5.1 Support
Anodized aluminium support (as shown in Figure 1) for the preparation of test specimens,
consisting of two pivoting, L-shaped anodized aluminium support elements of 2 mm thickness
riveted onto an anodized aluminium base-plate of 2 mm thickness such that a cavity of dimensions
120 mm × 20 mm × 18 mm (length × width × height) is formed.
Riveting of the support elements on the base-plate shall be such that they can be turned freely with
minimal friction on the pivot (fulcrum). The base plate holds five (5) equally spaced holes of 5 mm
diameter (for improved ventilation of the back face of the sealant such as to ensure better cure or
drying of the sealant) and two 3 mm holes for fixation of the specimen (see Figure 1 and Annex A). For
the specification of the anodized aluminium, refer to ISO 13640. All surfaces of the anodized aluminium
support to be later in contact with the sealant should be cleaned according to the sealant manufacturer’s
recommendation.
Achieving optimum adhesion on the support substrate is important in order to obtain reproducible
ratings for surface and bulk degradation (cracking, crazing, cohesive failure, etc.) that is induced or
influenced by mechanical cycling. Even a partial loss of adhesion causes a section of the test specimen
to be exposed to no or a lower degree of mechanical cycling than intended for a given movement
amplitude of the sealant and invalidate the results obtained for this movement exposure (as assessed
along the extended leg of the test specimen). Currently, no cleaning procedure and cleaning agent(s)
have been identified that provide optimum adhesion on the support substrate for all sealant products.
Therefore, no cleaning procedure is specified in this document. If the manufacturer does not provide
a recommendation for the cleaning procedure, the following method is suggested for consideration by
the experimenter. Clean all surfaces of the anodized aluminium support to be later in contact with the
sealant with high purity acetone (purity, by gas chromatography: 998 g/kg) as follows:
a) saturate a clean, lint-free paper tissue or cloth with the solvent;
b) clean the substrate with the solvent-saturated cloth or tissue by wiping a minimum of three times
so that visible contamination cannot be observed;
c) wipe the substrate with solvent-saturated cloth or tissue and immediately afterwards dry wipe the
substrate surface thoroughly using a dry, clean, lint-free paper tissue or cloth before the solvent
completely evaporates.
Repeat step c) at least once. In each wipe of the substrate surface during step c), a new, uncontaminated
cloth or tissue should be used. For severely contaminated substrates, additional pre-cleaning steps may
be required.
If other support materials are to be used, they should be characterised and described in the test report.
If other support dimensions are used, they should be described in the test report.
5.2 Spacers
Spacers for the preparation of the specimens, of dimensions 20 mm × 18 mm × 10 mm, with anti-
adherent surface (see Figure 1), shall be used. If the spacers are made of material to which the sealant
adheres, their surface shall be made anti-adherent, e.g. by a thin wax coating.
Dimensions in millimetres
Key
1 rivet
2 3 mm Ø hole (for fixing)
3 5 mm Ø hole (for ventilation)
4 sealant
5 3 mm PE or PU open-cell foam
NOTE Sealant in anodised aluminium support is exposed to cyclic mechanical movement of sealant.
Figure 1 — Schematic drawing of test specimen
5.3 Backing material (bond breaker)
Open-cell foam backing material (polyethylene (PE) or polyurethane (PU) foam) of 3 mm thickness
for the preparation of test specimens shall be used. The foam backing material shall not restrict the
movement of the L-shaped pivoted support elements.
5.4 Separators
Separators, of appropriate dimensions, shall be used to hold the test specimens in extension up to the
maximum specified movement amplitude of the sealant (see Annex B).
5.5 Container
Container filled with demineralised or distilled water shall be used for conditioning according to
method B (see 7.3).
5.6 Ventilated convection-type oven
Ventilated convection-type oven, capable of being maintained at (70 ± 2) °C, shall be used for
conditioning according to method B (see 7.3).
5.7 Fully automated test chamber with an artificial light source
Fully automated test chamber with an artificial light source (see 5.8) shall be used, capable of exposing
the test specimens to radiation under controlled conditions of temperature, relative humidity and
water, conforming to the requirements of the ISO 4892 series. The radiation is always directed towards
the same surface of the sealant specimen. Standard practices for operating such accelerated weathering
chambers are described in ISO 4892-1.
In fully automated test equipment, exposure to water for this test method is accomplished by water
1),2) ,3)
spraying the specimen surface or immersing the test specimens in water .Contamination of the
water shall be avoided. The purity of the water to be used is described in ISO 4892-1.
In the immersion technique, the test specimens are placed in a chamber that is periodically flooded
with re-circulated water. During immersion, the specimens are completely covered by water. The
water temperature is measured below the water surface with the black standard thermometer. The
immersion system shall be made from corrosion-resistant materials that do not contaminate the water
employed.
5.8 Artificial light source
5.8.1 General
Light sources for the simulation of the global radiation at the surface of the earth are subject to
development. The degree of approximation to the spectral power distribution according to CIE 085-
1) Adequate heat transfer between the test specimen and the environment is essential during the lower
temperature period in the fluorescent UV/condensation device in order for condensation on the sealant to occur.
This places restrictions on the thermal mass and, consequently, on the dimensions of a specimen. No experimental
data have been generated on the time-of-wetness of sealant test specimens of the kind specified in this document
when placed in fluorescent UV/condensation device operating at conditions specified in this document. However,
testing conducted by ASTM C24 on ISO 8339 specimens appears to suggest that the condensation process provided
in the fluorescent UV/condensation apparatus is generally not applicable to the type of sealant specimens tested.
Therefore, wetting in this document is carried out by water spray on the exposed specimen surface (default method).
However, the front surface water spray accessory was not designed for this purpose and requires an unreasonable
amount of pure water for the wet period specified. Therefore, often the equipment is modified to allow re-circulation
of the water during the exposure period. Some fluorescent UV equipment has adaptable spray manifolds, which
allow installation of lower flow type nozzles, thus reducing the amount of pure water used.
2) Data generated with these two methods of water exposure (spray or immersion) in a interlaboratory
test on a set of sealants for revision of ISO 11431 showed acceptable correlation, although contributions to the
various degradation mechanisms acting in the specimens (e.g. hydrolysis, thermal shock, leaching of formulation
components) can differ between these exposures. The degree of correlation between these two methods thus can
vary depending on the specific sealant tested.
3) Spray water can be fresh or re-circulated from a holding tank. Immersion water is generally in a holding tank
for re-circulation. The temperature of the spray water is uncontrolled and for fresh water is typically (21 ± 5) °C.
Recirculated spray water can be at a higher temperature. The uncontrolled temperature of the re-circulated
immersion water during operation of the weathering device is typically (40 ± 5) °C. It can be controlled by heating
the water to a higher temperature. However, heating is not desirable because the water immersion temperature
would then differ to a larger extent from the spray water temperature.
1989, Table 4 depends on the type of lamp. Xenon-arc lamps with suitable filters are preferred and are
considered the default for the purpose of this document.
Several factors can change the intensity and the spectral power distribution of the artificial light source
during service. Follow the manufacturer’s recommendations and the requirements of the ISO 4892
series to maintain constant irradiation conditions.
5.8.2 Xenon-arc light source (default)
Xenon-arc light source with daylight filters shall be used for the simulation of terrestrial daylight
as defined in the CIE 085. The spectral power distribution of the radiation shall conform to the
requirements outlined in ISO 4892-2:2013, Table 1.
5.8.3 Fluorescent ultraviolet source (option)
Fluorescent UVA-340 lamp(s) shall be used. The radiation of UVA-340 lamp(s) is mainly in the ultraviolet
region between 300 nm and 360 nm with negligible visible and infrared radiation. The spectral power
distribution of the radiation shall conform to the requirements outlined in ISO 4892-3:2016, Table 1.
5.8.4 Open-flame carbon arc source (option)
Open-flame carbon arc light sources typically use carbon rods, which contain a mixture of metal salts.
An electric current is passed between the carbon rods, which burn and give off ultraviolet, visible, and
infrared radiation. Use carbon rods recommended by the device manufacturer. Open-flame carbon
arc light source with daylight type filter (type 1 filter) is used. The spectral power distribution of the
4)
radiation shall conform to the requirements outlined in ISO 4892-4:2013, Table 1 .
5.9 Black standard (insulated) and black panel (uninsulated) temperature sensors
Black standard (defaul
...