ISO 19862:2015

INTERNATIONAL ISO
STANDARD 19862
First edition
2015-11-01
Buildings and civil engineering
works — Sealants — Durability to
extension compression cycling under
accelerated weathering
Bâtiments et ouvrages de génie civil — Mastics — Durabilité à un cycle
d’extension-compression dans des conditions de vieillissement accéléré
Reference number
©
ISO 2015
© ISO 2015, Published in Switzerland
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ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative reference . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
6 Preparation of test specimens . 4
7 Conditioning of test specimens . 5
7.1 General . 5
7.2 Method A . 5
7.3 Method B . 5
8 Test procedure . 5
8.1 General . 5
8.2 Test Procedure. 5
9 Evaluation and expression of results . 6
10 Test report . 6
Bibliography . 8
Foreword
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The committee responsible for this document is ISO/TC 59, Buildings and civil engineering works,
Subcommittee SC 8, Sealants.
iv © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 19862:2015(E)
Buildings and civil engineering works — Sealants —
Durability to extension compression cycling under
accelerated weathering
1 Scope
This International Standard specifies a method for the determination of classification of durability of
sealants used in exterior joints in building construction.
2 Normative reference
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.
1)
ISO 4892-1 , 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
2)
ISO 4892-3 , Plastics — Methods of exposure to laboratory light sources — Part 3: Fluorescent UV lamps
ISO 4892-4, Plastics — Methods of exposure to laboratory light sources — Part 4: Open-flame carbon-arc
lamps
ISO 6927, Buildings and civil engineering works — Sealants — Vocabulary
ISO 13640, Building construction — Jointing products — Specifications for test substrates
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6927 apply.
4 Principle
Test specimens are prepared such that the sealant to be tested adheres to two parallel contact surfaces.
The cured and conditioned test specimens are compressed to a defined width and this compression
is maintained under accelerated weathering conditions. The test specimens are then extended to a
defined width and this extension is maintained under accelerated weathering conditions. The samples
are evaluated to record any loss of adhesion or cohesion is recorded along with recording if light can be
visible through the specimen.
1) To be published. (Revision of ISO 4892-1:1999)
2) To be published. (Revision of ISO 4892-3:2013)
5 Apparatus
5.1 Substrate materials, for the preparation of test specimens as defined in ISO 13640. The substrate
materials shall be selected from mortar type 1 or type 2. Other substrate materials may be used as agreed
by the parties concerned.
For each test specimen, two substrate pieces of the same material are required with a cross section
of dimensions as shown in Figure 1. Test substrates of other dimensions may be used, but then the
dimensions of the sealant bead and the area of adhesion shall be the same as those shown in Figure 1.
5.2 Spacers, cross section (12 mm × 12 mm) with anti-adherent surface. For the preparation of test
specimens see Figure 1.
Dimensions in millimetres
Key
1 mortar substrates
2 sealant
3 spacer
Figure 1 — Test specimen with mortar substrates
5.3 Anti-adherent substrate, for the preparation of the test specimens, e.g. polyethylene (PE) film,
according to the advice of the sealant manufacturer. (See ISO 8339, 5.3).
5.4 Tensile test machine, with recording device, capable of extending the test specimens at a rate of
(5,5 ±0,7) mm/min.
5.5 Ventilated convection-type oven, capable of being maintained at (70 ± 2) °C for conditioning
according to method B (see 7.3).
2 © ISO 2015 – All rights reserved

5.6 Container, for immersing test specimens in distilled water for conditioning according to
method B (see 7.3).
5.7 Separators and clamps, with appropriate dimensions to hold the test specimens extended
or compressed to 12,5%, 20%, or 25 % of the original width or any other width agreed between the
parties concerned.
5.8 Measuring device, accuracy to ±0,5 mm.
5.9 Light device, capable of shining light on the back surface of the specimen.
5.10 Fully automated artificial weathering test chamber with an artificial light source, fully
automated test chamber with an artificial light source (see 5.11), shall be used, capable of exposing the
test specimens to radiation under controlled conditions of temperature, relative humidity, and water,
complying with the requirements of ISO 4892-1, ISO 4892-2, ISO 4892-3, and ISO 4892-4. 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.
The level of irradiance and water exposure at the specimen surface may not be altered.
In fully automated test equipment, exposure to water for this test method is accomplished by water
spraying the specimen surface or immersing the test specimens in water (see Note 1 and Note
2). Contamination of the water is to be avoided. The purity of the water to be used is described in
ISO 4892-1. The water temperatures are typically (21 ± 5) °C for the spray water and typically (40 ± 5)
°C for the re-circulated immersion water (see Note 3).
Suitable equipment and test procedures for cyclic exposures to water are described in ISO 4892-1,
ISO 4892-2, ISO 4892-3, and ISO 4892-4. Water is a key factor contributing to the ageing of sealants,
especially in combination with exposure to light. In xenon arc devices that use water spray for wetting,
relative humidity during the light period shall be maintained at (50 ± 10) % RH, (see ISO 4892-2:2013,
Table 3, Method A, Cycle Number 1) (see Note 4).
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 spray water can be at a higher temperature. The uncontrolled temperature of the re-
circulated immersion water during operation of the weathering d
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