SIST EN ISO 22970:2021
(Main)Paints and varnishes - Test method for evaluation of adhesion of elastic adhesives on coatings by peel test, peel strength test and tensile lap-shear strength test with additional stress by condensation test or cataplasm storage (ISO 22970:2019)
Paints and varnishes - Test method for evaluation of adhesion of elastic adhesives on coatings by peel test, peel strength test and tensile lap-shear strength test with additional stress by condensation test or cataplasm storage (ISO 22970:2019)
This document specifies three methods for testing the peel adhesion, peel strength and tensile lap-shear strength in order to evaluate the adhesive bond as well as the type, location and structure of failures of elastic adhesives on coatings. These methods are used, for example, for testing the assembly with respect to the bond of panes or built-on parts, such as plastic covers, spoilers, instrument panel covers, headlights, with coatings for automobile construction. The two methods of climatic exposure of specimens described herein are the condensation test and cataplasm storage.
This document does not specify requirements for adhesives and coatings.
NOTE The peel strength test (method B) for rigid car body construction adhesives is described in ISO 8510‑2. The tensile lap-shear strength test (method C) for rigid car body construction adhesives is described in EN 1465. Testing of rigid car body construction adhesives is generally conducted on small joint thicknesses, i.e. <1 mm.
Beschichtungsstoffe - Prüfverfahren zur Beurteilung der Haftfestigkeit von elastischen Klebstoffen auf Beschichtungen durch Prüfen der Schälhaftung, Schälfestigkeit und Zugscherfestigkeit mit zusätzlicher Beanspruchung durch Kondenswasserprüfung oder Kataplasmalagerung (ISO 22970:2019)
Dieses Dokument legt drei Verfahren zum Prüfen der Schälhaftung, Schälfestigkeit und Zugscherfestigkeit zur Beurteilung des Klebeverbundes sowie der Bruchart, des Bruchortes und des Bruchgefüges von elastischen Klebstoffen auf Beschichtungen fest. Die Verfahren werden zum Beispiel zum Prüfen des Verbundes bei der Verklebung von Scheiben oder Anbauteilen, z. B. Kunststoffabdeckungen, Spoiler, Armaturenverkleidungen, Scheinwerfer, mit Beschichtungen im Automobilbau eingesetzt. Zur klimatischen Beanspruchung der Proben werden zwei Verfahren beschrieben, Kondenswasserprüfung und Kataplasmalagerung.
Dieses Dokument legt keine Anforderungen an Klebstoffe und Beschichtungen fest.
ANMERKUNG Die Prüfung der Schälfestigkeit (Verfahren B) von starren Karosseriebau-Klebstoffen ist in ISO 8510 2 beschrieben. Die Prüfung der Zugscherfestigkeit (Verfahren C) von starren Karosseriebau-Klebstoffen ist in EN 1465 beschrieben. Die Prüfung von starren Karosseriebau-Klebstoffen wird im Allgemeinen bei geringen Fugendicken, d. h. < 1 mm, durchgeführt.
Peintures et vernis - Évaluation de l'adhérence des adhésifs élastiques sur les produits de peinture en examinant l'adhérence, la résistance au pelage et la résistance à la traction et le cisaillement en combinaison avec l'exposition à l'eau de condensation ou au cataplasme (ISO 22970:2019)
Le présent document spécifie trois méthodes d'essai déterminant l'adhérence au pelage, la résistance au pelage et la résistance au cisaillement en traction afin d'évaluer l'assemblage collé ainsi que le type, l'emplacement et la structure des ruptures des adhésifs élastiques sur des produits de peinture. Ces méthodes d'essai sont utilisées, notamment, pour évaluer l'assemblage au niveau de la liaison de panneaux ou de parties intégrées, telles que caches plastiques, déflecteurs, caches de tableau de bord, feux avant, revêtus de produits de peinture pour la construction automobile. Les deux méthodes d'exposition climatique des éprouvettes décrites dans le présent document sont l'essai de condensation et la méthode dite du cataplasme.
Le présent document ne spécifie aucune exigence pour les adhésifs et les revêtements en produits de peinture.
NOTE L'essai de résistance au pelage (méthode B) pour les adhésifs sur rigide (carrosserie automobile) est décrit dans l'ISO 8510‑2. L'essai de résistance au cisaillement en traction (méthode C) pour les adhésifs sur rigide (carrosserie automobile) est décrit dans l'EN 1465. Les essais des adhésifs sur rigide pour la carrosserie automobile sont généralement réalisés sur des épaisseurs de joint fines < 1 mm.
Barve in laki - Preskusna metoda za vrednotenje oprijema elastičnih lepil na premaze s preskusom luščenja, preskusom lepilne trdnosti in preskusom strižne trdnosti prekritih spojev z nategom pri dodatnem obremenjevanju s kondenzacijo ali vlažnim povijanjem (ISO 22970:2019)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 22970:2021
01-marec-2021
Barve in laki - Preskusna metoda za vrednotenje oprijema elastičnih lepil na
premaze s preskusom luščenja, preskusom lepilne trdnosti in preskusom strižne
trdnosti prekritih spojev z nategom pri dodatnem obremenjevanju s kondenzacijo
ali vlažnim povijanjem (ISO 22970:2019)
Paints and varnishes - Test method for evaluation of adhesion of elastic adhesives on
coatings by peel test, peel strength test and tensile lap-shear strength test with additional
stress by condensation test or cataplasm storage (ISO 22970:2019)
Beschichtungsstoffe - Prüfverfahren zur Beurteilung der Haftfestigkeit von elastischen
Klebstoffen auf Beschichtungen durch Prüfen der Schälhaftung, Schälfestigkeit und
Zugscherfestigkeit mit zusätzlicher Beanspruchung durch Kondenswasserprüfung oder
Kataplasmalagerung (ISO 22970:2019)
Peintures et vernis - Évaluation de l'adhérence des adhésifs élastiques sur les produits
de peinture en examinant l'adhérence, la résistance au pelage et la résistance à la
traction et le cisaillement en combinaison avec l'exposition à l'eau de condensation ou
au cataplasme (ISO 22970:2019)
Ta slovenski standard je istoveten z: EN ISO 22970:2020
ICS:
87.040 Barve in laki Paints and varnishes
SIST EN ISO 22970:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 22970:2021
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SIST EN ISO 22970:2021
EN ISO 22970
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2020
EUROPÄISCHE NORM
ICS 87.040
English Version
Paints and varnishes - Test method for evaluation of
adhesion of elastic adhesives on coatings by peel test, peel
strength test and tensile lap-shear strength test with
additional stress by condensation test or cataplasm
storage (ISO 22970:2019)
Peintures et vernis - Évaluation de l'adhérence des Beschichtungsstoffe - Prüfverfahren zur Beurteilung
adhésifs élastiques sur les produits de peinture en der Haftfestigkeit von elastischen Klebstoffen auf
examinant l'adhérence, la résistance au pelage et la Beschichtungen durch Prüfen der Schälhaftung,
résistance à la traction et le cisaillement en Schälfestigkeit und Zugscherfestigkeit mit zusätzlicher
combinaison avec l'exposition à l'eau de condensation Beanspruchung durch Kondenswasserprüfung oder
ou au cataplasme (ISO 22970:2019) Kataplasmalagerung (ISO 22970:2019)
This European Standard was approved by CEN on 30 November 2020.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 22970:2020 E
worldwide for CEN national Members.
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SIST EN ISO 22970:2021
EN ISO 22970:2020 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 22970:2021
EN ISO 22970:2020 (E)
European foreword
The text of ISO 22970:2019 has been prepared by Technical Committee ISO/TC 35 "Paints and
varnishes” of the International Organization for Standardization (ISO) and has been taken over as
EN ISO 22970:2020 by Technical Committee CEN/TC 139 “Paints and varnishes” the secretariat of
which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2021, and conflicting national standards shall be
withdrawn at the latest by June 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 22970:2019 has been approved by CEN as EN ISO 22970:2020 without any modification.
3
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SIST EN ISO 22970:2021
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SIST EN ISO 22970:2021
INTERNATIONAL ISO
STANDARD 22970
First edition
2019-05
Paints and varnishes — Test method
for evaluation of adhesion of elastic
adhesives on coatings by peel test,
peel strength test and tensile lap-
shear strength test with additional
stress by condensation test or
cataplasm storage
Peintures et vernis — Évaluation de l'adhérence des adhésifs
élastiques sur les produits de peinture en examinant l'adhérence, la
résistance au pelage et la résistance à la traction et le cisaillement
en combinaison avec l'exposition à l'eau de condensation ou au
cataplasme
Reference number
ISO 22970:2019(E)
©
ISO 2019
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SIST EN ISO 22970:2021
ISO 22970:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
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SIST EN ISO 22970:2021
ISO 22970:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
4.1 Adhesive strength test method A — Peel adhesion . 2
4.2 Adhesive strength test method B — Peel strength . 2
4.3 Adhesive strength test method C — Tensile lap-shear strength . 3
4.4 Conduction of the test . 3
5 Apparatus and test media . 3
5.1 Adhesive strength test method A — Peel adhesion . 3
5.2 Adhesive strength test method B — Peel strength . 4
5.3 Adhesive strength test method C — Tensile lap-shear strength . 4
5.4 Exposure method 1 — Condensation atmosphere with constant humidity . 5
5.5 Exposure method 2 — Cataplasm storage . 5
6 Sequence of adhesive strength tests A, B and C . 5
7 Preparation of specimens . 6
7.1 Preparation of test panels . 6
7.2 Adhesive strength test method A — Peel adhesion . 6
7.2.1 Bead shape . 6
7.2.2 Application of the adhesive bead . 7
7.3 Adhesive strength test method B — Peel strength .10
7.4 Adhesive strength test method C — Tensile lap-shear strength .11
8 Curing and exposure of specimens with applied adhesive .14
8.1 Curing .14
8.2 Reference value determination .15
8.3 Exposure methods .15
8.3.1 Exposure method 1 — Condensation atmosphere with constant humidity .15
8.3.2 Exposure method 2 — Cataplasm storage .15
9 Test procedure .15
9.1 Adhesive strength test method A — Peel adhesion .15
9.2 Adhesive strength test method B — Peel strength .17
9.3 Adhesive strength test method C — Tensile lap-shear strength .18
10 Expression of results .18
10.1 Adhesive strength test method A — Peel adhesion .18
10.2 Adhesive strength test method B — Peel strength .19
10.3 Adhesive strength test method C — Tensile lap-shear strength .20
11 Designation .20
12 Precision .21
13 Test report .21
Bibliography .23
© ISO 2019 – All rights reserved iii
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SIST EN ISO 22970:2021
ISO 22970:2019(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.
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 documents 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).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee
SC 9, General test methods for paints and varnishes.
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.
iv © ISO 2019 – All rights reserved
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SIST EN ISO 22970:2021
INTERNATIONAL STANDARD ISO 22970:2019(E)
Paints and varnishes — Test method for evaluation of
adhesion of elastic adhesives on coatings by peel test,
peel strength test and tensile lap-shear strength test with
additional stress by condensation test or cataplasm storage
1 Scope
This document specifies three methods for testing the peel adhesion, peel strength and tensile lap-
shear strength in order to evaluate the adhesive bond as well as the type, location and structure of
failures of elastic adhesives on coatings. These methods are used, for example, for testing the assembly
with respect to the bond of panes or built-on parts, such as plastic covers, spoilers, instrument panel
covers, headlights, with coatings for automobile construction. The two methods of climatic exposure of
specimens described herein are the condensation test and cataplasm storage.
This document does not specify requirements for adhesives and coatings.
NOTE The peel strength test (method B) for rigid car body construction adhesives is described in ISO 8510-2.
The tensile lap-shear strength test (method C) for rigid car body construction adhesives is described in EN 1465.
Testing of rigid car body construction adhesives is generally conducted on small joint thicknesses, i.e. <1 mm.
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 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning
and testing
ISO 4618, Paints and varnishes — Terms and definitions
ISO 6270-2, Paints and varnishes — Determination of resistance to humidity — Part 2: Condensation (in-
cabinet exposure with heated water reservoir)
ISO 10365, Adhesives — Designation of main failure patterns
ISO 17872, Paints and varnishes — Guidelines for the introduction of scribe marks through coatings on
metallic panels for corrosion testing
DIN 55997, Solvents for paints and varnishes — Deionized water — Requirements and methods of test
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
© ISO 2019 – All rights reserved 1
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SIST EN ISO 22970:2021
ISO 22970:2019(E)
3.1
adhesive
non-metallic substance capable of joining materials by surface bonding (adhesion), where the bond
possessing adequate internal strength for force transmission
3.2
adherend
body that is, or is intended to be, held to another body
Note 1 to entry: “Adherend” is a narrower term than “substrate”.
[SOURCE: ISO 472:2013, 2.13]
3.3
tensile lap-shear strength
stressing in shear of an overlap specimen between rigid adherends (3.2) by applying to the adherends a
tensile force which is parallel to the bond area and to the major axis of the specimen
3.4
cohesion failure
cohesive failure
failure of an adhesive bond within the body of the adhesive (3.1), i.e. not at the interface
[SOURCE: ISO 472:2013, 2.159]
3.5
adhesion failure
adhesive failure
failure of an adhesive bond in such a way that the separation appears to be at the adhesive/adherend
interface
[SOURCE: ISO 472:2013, 2.30]
4 Principle
4.1 Adhesive strength test method A — Peel adhesion
It describes the peel adhesion test of adhesives on coatings. This method is suitable where a qualitative,
i.e. visual, evaluation of an adhesive’s behaviour is sufficient or when testing large and voluminous parts.
The adhesive is applied to the test panel in form of a (round or triangular) bead, dried and peeled off the
coating using a cutter knife and, if required, pliers. This is followed by a visual evaluation of the failure
pattern.
4.2 Adhesive strength test method B — Peel strength
It describes the adhesive strength testing of adhesives by determination of the peel force. This method
enhances the range of results obtained using method A by additional quantitative measurement values
and enables a statement as to which forces are transmitted to the adherend.
The adhesive is applied to the test panel to be bonded in form of a (round or triangular) bead, pressed
to the required thickness using a suitable thin plate and cured. A tensile force is applied to the plate
thereby peeling it off the bond in a defined angle. The reported result is the maximum force measured
for each bond width (see Figure 20).
2 © ISO 2019 – All rights reserved
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SIST EN ISO 22970:2021
ISO 22970:2019(E)
4.3 Adhesive strength test method C — Tensile lap-shear strength
It describes the adhesive strength testing of adhesives on coatings by determination of the tensile lap-
shear strength. This method yields both qualitative and quantitative results. It is suitable for testing
complete bonded assemblies as later used in practice. This also includes the use of original adherends.
The tensile lap-shear strength of overlap specimens is determined by stressing in shear of an overlap
joint between rigid adherends by applying to the adherends a tensile force which is parallel to the bond
area and to the major axis of the specimen. The reported result is the maximum force or maximum
tensile shear stress measured for each bond width.
4.4 Conduction of the test
After complete curing of the adhesive, testing is conducted according to adhesive strength test method A,
B or C, either immediately or following subsequent climatic exposure (exposure method 1 or 2).
5 Apparatus and test media
Normal laboratory equipment together with the following.
5.1 Adhesive strength test method A — Peel adhesion
5.1.1 Test panel, e.g. coated plates having dimensions of approximately 200 mm × 100 mm and
a thickness of 0,7 mm to 1,2 mm or coated plastic or coated glass (float glass) having a thickness of
approximately 4 mm. The thickness shall be sufficient to prevent deformation or fracture of the test
panel in combination with the specimen grip under the expected tensile load when peeling off the bead.
Specimen preparation, coating and drying/curing shall be indicated in the test report.
5.1.2 Adhesive, as agreed between the interested parties, supplied in a commercially available can.
5.1.3 Application gun, for applying the adhesive.
5.1.4 Doctor blade, for forming the adhesive beads (see Figure 1).
Dimensions in millimetres
Figure 1 — Example for doctor blade design
5.1.5 Vapour barrier, e.g. strips of PE film or siliconized paper, e.g. baking paper, having dimensions
of approximately 200 mm × 25 mm and a thickness of about 0,1 mm.
© ISO 2019 – All rights reserved 3
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SIST EN ISO 22970:2021
ISO 22970:2019(E)
5.1.6 Spacer, according to the agreed bond thickness.
5.1.7 Cutter knife, which shall be in accordance with ISO 17872, designed as agreed between the
interested parties.
5.1.8 Commercially available adhesive tape, approximately 20 mm wide.
5.1.9 Pliers, designed as agreed between the interested parties, e.g. needle-nose pliers.
5.2 Adhesive strength test method B — Peel strength
5.2.1 Test panel, e.g. coated plates having dimensions of at least 250 mm × 70 mm and a thickness
of 0,7 mm to 1,2 mm. The thickness shall be sufficient to prevent deformation of the test panel in
combination with the specimen holder under the expected tensile load when peeling off the bead.
Specimen preparation, coating and drying/curing shall be indicated in the test report.
5.2.2 Adhesive, as agreed between the interested parties, supplied in a commercially available can.
5.2.3 Application gun, for applying the adhesive.
5.2.4 Strips of PE film or siliconized paper, e.g. baking paper, having dimensions of approximately
70 mm × 100 mm and a thickness of about 0,1 mm.
5.2.5 Peeling plate, just thick enough to enable transmission of the expected tensile forces
to the adhesive while allowing bending without using excessive force, e.g. aluminium A1050P,
25 mm × 250 mm × 0,5 mm.
5.2.6 Spacer, according to the agreed bond thickness.
5.2.7 Tensile testing machine, having a nominal load suitable for the respective adhesive bond,
e.g. 10 kN.
The response time of the testing machine shall be sufficiently short to prevent influences on the
accuracy when measuring the force at failure. The recorded force shall not deviate from the actually
required force by more than 1 %. The testing machine shall be capable of applying the required tensile
force increasing at a steady rate. It shall be provided with a pair of suitable self-aligning grips to hold
the specimen. The grips and attachments shall be constructed such as to move into alignment with
the specimen as soon as the force is applied, so that the longitudinal axis of the specimen will coincide
with the direction of the required force through the centre line of the grip assembly to avoid bending
moment. Grips that operate by bolting through the adherends shall not be used since tearing of the
bolting holes is to be expected.
5.3 Adhesive strength test method C — Tensile lap-shear strength
5.3.1 Test panel, e.g. coated plates having dimensions of at least 75 mm × 25 mm and a thickness
of 0,7 mm to 1,2 mm or coated plastic or coated glass (float glass) having a thickness of approximately
6 mm. The test panel strength shall be sufficient to enable transmission of the occurring tensile forces to
the bond.
Specimen preparation, coating and drying/curing shall be indicated in the test report.
5.3.2 Adhesive, as agreed between the interested parties, supplied in a commercially available can.
4 © ISO 2019 – All rights reserved
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SIST EN ISO 22970:2021
ISO 22970:2019(E)
5.3.3 Application gun, for applying the adhesive.
5.3.4 Jig, for accurately locating adherends during bonding.
5.3.5 Spacer, according to the agreed bond thickness or bonding frame with non-adhesive film or
coating.
5.3.6 Tensile testing machine, having a nominal load suitable for the respective adhesive bond,
e.g. 10 kN.
The response time of the testing machine shall be sufficiently short to prevent influences on the
accuracy when measuring the force at failure. The recorded force shall not deviate from the actually
required force by more than 1 %. The testing machine shall be capable of applying the required tensile
force increasing at a steady rate. It shall be provided with a pair of suitable self-aligning grips to hold
the specimen. The grips and attachments shall be constructed such as to move into alignment with
the specimen as soon as the force is applied, so that the longitudinal axis of the specimen will coincide
with the direction of the required force through the centre line of the grip assembly to avoid bending
moment. Grips that operate by bolting through the adherends shall not be used since tearing of the
bolting holes is to be expected.
5.4 Exposure method 1 — Condensation atmosphere with constant humidity
5.4.1 Apparatus for testing in a condensation atmosphere with constant humidity shall be in
accordance with ISO 6270-2.
5.5 Exposure method 2 — Cataplasm storage
5.5.1 Laboratory drying chamber, capable of maintaining the test temperature within ±2 °C (for
temperatures up to 150 °C). A laboratory drying chamber with technical ventilation shall be used.
5.5.2 Freezer, adjustable to (−20 ± 2) °C.
5.5.3 Aluminium foil, commercial quality.
5.5.4 Plastic bag made of polyethylene, at least 0,22 mm thick, heat resistant and sealable or
thermally sealable with an appropriate sealing device.
5.5.5 Deionized water, which shall be in accordance with DIN 55997, but with a maximum
conductivity of 20 µS/cm.
5.5.6 Purified absorbent cotton, single layer, rectangular, pH neutral.
6 Sequence of adhesive strength tests A, B and C
Table 1 gives an overview over the sequence of adhesive strength tests A, B and C.
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SIST EN ISO 22970:2021
ISO 22970:2019(E)
Table 1 — Sequence of adhesive strength tests A, B and C
Process step Method A: Method B: Method C:
Peel adhesion Peel strength Tensile lap-shear
strength
Preparation of test panels according to 7.1
Preparation of specimens according to 7.2 according to 7.3 according to 7.4
Curing of applied adhesive according to 8.1
Determination of reference va
...
SLOVENSKI STANDARD
oSIST prEN ISO 22970:2020
01-september-2020
Barve in laki - Preskusna metoda za vrednotenje oprijema elastičnih lepil na
premazih s preskušanjem luščenja, trdnosti luščenja ter natezne in strižne trdnosti
z dodatnimi obremenitvami s kondenzacijsko vodo ali shranjevanjem v kataplazmi
(ISO 22970:2019)
Paints and varnishes - Test method for evaluation of adhesion of elastic adhesives on
coatings by peel test, peel strength test and tensile lap-shear strength test with additional
stress by condensation test or cataplasm storage (ISO 22970:2019)
Beschichtungsstoffe - Prüfverfahren zur Beurteilung der Haftfestigkeit von elastischen
Klebstoffen auf Beschichtungen durch Prüfen der Schälhaftung, Schälfestigkeit und
Zugscherfestigkeit mit zusätzlicher Beanspruchung durch Kondenswasserprüfung oder
Kataplasmalagerung (ISO 22970:2019)
Peintures et vernis - Évaluation de l'adhérence des adhésifs élastiques sur les produits
de peinture en examinant l'adhérence, la résistance au pelage et la résistance à la
traction et le cisaillement en combinaison avec l'exposition à l'eau de condensation ou
au cataplasme (ISO 22970:2019)
Ta slovenski standard je istoveten z: prEN ISO 22970
ICS:
87.040 Barve in laki Paints and varnishes
oSIST prEN ISO 22970:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 22970:2020
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oSIST prEN ISO 22970:2020
INTERNATIONAL ISO
STANDARD 22970
First edition
2019-05
Paints and varnishes — Test method
for evaluation of adhesion of elastic
adhesives on coatings by peel test,
peel strength test and tensile lap-
shear strength test with additional
stress by condensation test or
cataplasm storage
Peintures et vernis — Évaluation de l'adhérence des adhésifs
élastiques sur les produits de peinture en examinant l'adhérence, la
résistance au pelage et la résistance à la traction et le cisaillement
en combinaison avec l'exposition à l'eau de condensation ou au
cataplasme
Reference number
ISO 22970:2019(E)
©
ISO 2019
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oSIST prEN ISO 22970:2020
ISO 22970:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
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Published in Switzerland
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oSIST prEN ISO 22970:2020
ISO 22970:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
4.1 Adhesive strength test method A — Peel adhesion . 2
4.2 Adhesive strength test method B — Peel strength . 2
4.3 Adhesive strength test method C — Tensile lap-shear strength . 3
4.4 Conduction of the test . 3
5 Apparatus and test media . 3
5.1 Adhesive strength test method A — Peel adhesion . 3
5.2 Adhesive strength test method B — Peel strength . 4
5.3 Adhesive strength test method C — Tensile lap-shear strength . 4
5.4 Exposure method 1 — Condensation atmosphere with constant humidity . 5
5.5 Exposure method 2 — Cataplasm storage . 5
6 Sequence of adhesive strength tests A, B and C . 5
7 Preparation of specimens . 6
7.1 Preparation of test panels . 6
7.2 Adhesive strength test method A — Peel adhesion . 6
7.2.1 Bead shape . 6
7.2.2 Application of the adhesive bead . 7
7.3 Adhesive strength test method B — Peel strength .10
7.4 Adhesive strength test method C — Tensile lap-shear strength .11
8 Curing and exposure of specimens with applied adhesive .14
8.1 Curing .14
8.2 Reference value determination .15
8.3 Exposure methods .15
8.3.1 Exposure method 1 — Condensation atmosphere with constant humidity .15
8.3.2 Exposure method 2 — Cataplasm storage .15
9 Test procedure .15
9.1 Adhesive strength test method A — Peel adhesion .15
9.2 Adhesive strength test method B — Peel strength .17
9.3 Adhesive strength test method C — Tensile lap-shear strength .18
10 Expression of results .18
10.1 Adhesive strength test method A — Peel adhesion .18
10.2 Adhesive strength test method B — Peel strength .19
10.3 Adhesive strength test method C — Tensile lap-shear strength .20
11 Designation .20
12 Precision .21
13 Test report .21
Bibliography .23
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oSIST prEN ISO 22970:2020
ISO 22970:2019(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.
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 documents 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).
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. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee
SC 9, General test methods for paints and varnishes.
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.
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oSIST prEN ISO 22970:2020
INTERNATIONAL STANDARD ISO 22970:2019(E)
Paints and varnishes — Test method for evaluation of
adhesion of elastic adhesives on coatings by peel test,
peel strength test and tensile lap-shear strength test with
additional stress by condensation test or cataplasm storage
1 Scope
This document specifies three methods for testing the peel adhesion, peel strength and tensile lap-
shear strength in order to evaluate the adhesive bond as well as the type, location and structure of
failures of elastic adhesives on coatings. These methods are used, for example, for testing the assembly
with respect to the bond of panes or built-on parts, such as plastic covers, spoilers, instrument panel
covers, headlights, with coatings for automobile construction. The two methods of climatic exposure of
specimens described herein are the condensation test and cataplasm storage.
This document does not specify requirements for adhesives and coatings.
NOTE The peel strength test (method B) for rigid car body construction adhesives is described in ISO 8510-2.
The tensile lap-shear strength test (method C) for rigid car body construction adhesives is described in EN 1465.
Testing of rigid car body construction adhesives is generally conducted on small joint thicknesses, i.e. <1 mm.
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 3270, Paints and varnishes and their raw materials — Temperatures and humidities for conditioning
and testing
ISO 4618, Paints and varnishes — Terms and definitions
ISO 6270-2, Paints and varnishes — Determination of resistance to humidity — Part 2: Condensation (in-
cabinet exposure with heated water reservoir)
ISO 10365, Adhesives — Designation of main failure patterns
ISO 17872, Paints and varnishes — Guidelines for the introduction of scribe marks through coatings on
metallic panels for corrosion testing
DIN 55997, Solvents for paints and varnishes — Deionized water — Requirements and methods of test
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
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ISO 22970:2019(E)
3.1
adhesive
non-metallic substance capable of joining materials by surface bonding (adhesion), where the bond
possessing adequate internal strength for force transmission
3.2
adherend
body that is, or is intended to be, held to another body
Note 1 to entry: “Adherend” is a narrower term than “substrate”.
[SOURCE: ISO 472:2013, 2.13]
3.3
tensile lap-shear strength
stressing in shear of an overlap specimen between rigid adherends (3.2) by applying to the adherends a
tensile force which is parallel to the bond area and to the major axis of the specimen
3.4
cohesion failure
cohesive failure
failure of an adhesive bond within the body of the adhesive (3.1), i.e. not at the interface
[SOURCE: ISO 472:2013, 2.159]
3.5
adhesion failure
adhesive failure
failure of an adhesive bond in such a way that the separation appears to be at the adhesive/adherend
interface
[SOURCE: ISO 472:2013, 2.30]
4 Principle
4.1 Adhesive strength test method A — Peel adhesion
It describes the peel adhesion test of adhesives on coatings. This method is suitable where a qualitative,
i.e. visual, evaluation of an adhesive’s behaviour is sufficient or when testing large and voluminous parts.
The adhesive is applied to the test panel in form of a (round or triangular) bead, dried and peeled off the
coating using a cutter knife and, if required, pliers. This is followed by a visual evaluation of the failure
pattern.
4.2 Adhesive strength test method B — Peel strength
It describes the adhesive strength testing of adhesives by determination of the peel force. This method
enhances the range of results obtained using method A by additional quantitative measurement values
and enables a statement as to which forces are transmitted to the adherend.
The adhesive is applied to the test panel to be bonded in form of a (round or triangular) bead, pressed
to the required thickness using a suitable thin plate and cured. A tensile force is applied to the plate
thereby peeling it off the bond in a defined angle. The reported result is the maximum force measured
for each bond width (see Figure 20).
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4.3 Adhesive strength test method C — Tensile lap-shear strength
It describes the adhesive strength testing of adhesives on coatings by determination of the tensile lap-
shear strength. This method yields both qualitative and quantitative results. It is suitable for testing
complete bonded assemblies as later used in practice. This also includes the use of original adherends.
The tensile lap-shear strength of overlap specimens is determined by stressing in shear of an overlap
joint between rigid adherends by applying to the adherends a tensile force which is parallel to the bond
area and to the major axis of the specimen. The reported result is the maximum force or maximum
tensile shear stress measured for each bond width.
4.4 Conduction of the test
After complete curing of the adhesive, testing is conducted according to adhesive strength test method A,
B or C, either immediately or following subsequent climatic exposure (exposure method 1 or 2).
5 Apparatus and test media
Normal laboratory equipment together with the following.
5.1 Adhesive strength test method A — Peel adhesion
5.1.1 Test panel, e.g. coated plates having dimensions of approximately 200 mm × 100 mm and
a thickness of 0,7 mm to 1,2 mm or coated plastic or coated glass (float glass) having a thickness of
approximately 4 mm. The thickness shall be sufficient to prevent deformation or fracture of the test
panel in combination with the specimen grip under the expected tensile load when peeling off the bead.
Specimen preparation, coating and drying/curing shall be indicated in the test report.
5.1.2 Adhesive, as agreed between the interested parties, supplied in a commercially available can.
5.1.3 Application gun, for applying the adhesive.
5.1.4 Doctor blade, for forming the adhesive beads (see Figure 1).
Dimensions in millimetres
Figure 1 — Example for doctor blade design
5.1.5 Vapour barrier, e.g. strips of PE film or siliconized paper, e.g. baking paper, having dimensions
of approximately 200 mm × 25 mm and a thickness of about 0,1 mm.
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5.1.6 Spacer, according to the agreed bond thickness.
5.1.7 Cutter knife, which shall be in accordance with ISO 17872, designed as agreed between the
interested parties.
5.1.8 Commercially available adhesive tape, approximately 20 mm wide.
5.1.9 Pliers, designed as agreed between the interested parties, e.g. needle-nose pliers.
5.2 Adhesive strength test method B — Peel strength
5.2.1 Test panel, e.g. coated plates having dimensions of at least 250 mm × 70 mm and a thickness
of 0,7 mm to 1,2 mm. The thickness shall be sufficient to prevent deformation of the test panel in
combination with the specimen holder under the expected tensile load when peeling off the bead.
Specimen preparation, coating and drying/curing shall be indicated in the test report.
5.2.2 Adhesive, as agreed between the interested parties, supplied in a commercially available can.
5.2.3 Application gun, for applying the adhesive.
5.2.4 Strips of PE film or siliconized paper, e.g. baking paper, having dimensions of approximately
70 mm × 100 mm and a thickness of about 0,1 mm.
5.2.5 Peeling plate, just thick enough to enable transmission of the expected tensile forces
to the adhesive while allowing bending without using excessive force, e.g. aluminium A1050P,
25 mm × 250 mm × 0,5 mm.
5.2.6 Spacer, according to the agreed bond thickness.
5.2.7 Tensile testing machine, having a nominal load suitable for the respective adhesive bond,
e.g. 10 kN.
The response time of the testing machine shall be sufficiently short to prevent influences on the
accuracy when measuring the force at failure. The recorded force shall not deviate from the actually
required force by more than 1 %. The testing machine shall be capable of applying the required tensile
force increasing at a steady rate. It shall be provided with a pair of suitable self-aligning grips to hold
the specimen. The grips and attachments shall be constructed such as to move into alignment with
the specimen as soon as the force is applied, so that the longitudinal axis of the specimen will coincide
with the direction of the required force through the centre line of the grip assembly to avoid bending
moment. Grips that operate by bolting through the adherends shall not be used since tearing of the
bolting holes is to be expected.
5.3 Adhesive strength test method C — Tensile lap-shear strength
5.3.1 Test panel, e.g. coated plates having dimensions of at least 75 mm × 25 mm and a thickness
of 0,7 mm to 1,2 mm or coated plastic or coated glass (float glass) having a thickness of approximately
6 mm. The test panel strength shall be sufficient to enable transmission of the occurring tensile forces to
the bond.
Specimen preparation, coating and drying/curing shall be indicated in the test report.
5.3.2 Adhesive, as agreed between the interested parties, supplied in a commercially available can.
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5.3.3 Application gun, for applying the adhesive.
5.3.4 Jig, for accurately locating adherends during bonding.
5.3.5 Spacer, according to the agreed bond thickness or bonding frame with non-adhesive film or
coating.
5.3.6 Tensile testing machine, having a nominal load suitable for the respective adhesive bond,
e.g. 10 kN.
The response time of the testing machine shall be sufficiently short to prevent influences on the
accuracy when measuring the force at failure. The recorded force shall not deviate from the actually
required force by more than 1 %. The testing machine shall be capable of applying the required tensile
force increasing at a steady rate. It shall be provided with a pair of suitable self-aligning grips to hold
the specimen. The grips and attachments shall be constructed such as to move into alignment with
the specimen as soon as the force is applied, so that the longitudinal axis of the specimen will coincide
with the direction of the required force through the centre line of the grip assembly to avoid bending
moment. Grips that operate by bolting through the adherends shall not be used since tearing of the
bolting holes is to be expected.
5.4 Exposure method 1 — Condensation atmosphere with constant humidity
5.4.1 Apparatus for testing in a condensation atmosphere with constant humidity shall be in
accordance with ISO 6270-2.
5.5 Exposure method 2 — Cataplasm storage
5.5.1 Laboratory drying chamber, capable of maintaining the test temperature within ±2 °C (for
temperatures up to 150 °C). A laboratory drying chamber with technical ventilation shall be used.
5.5.2 Freezer, adjustable to (−20 ± 2) °C.
5.5.3 Aluminium foil, commercial quality.
5.5.4 Plastic bag made of polyethylene, at least 0,22 mm thick, heat resistant and sealable or
thermally sealable with an appropriate sealing device.
5.5.5 Deionized water, which shall be in accordance with DIN 55997, but with a maximum
conductivity of 20 µS/cm.
5.5.6 Purified absorbent cotton, single layer, rectangular, pH neutral.
6 Sequence of adhesive strength tests A, B and C
Table 1 gives an overview over the sequence of adhesive strength tests A, B and C.
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Table 1 — Sequence of adhesive strength tests A, B and C
Process step Method A: Method B: Method C:
Peel adhesion Peel strength Tensile lap-shear
strength
Preparation of test panels according to 7.1
Preparation of specimens according to 7.2 according to 7.3 according to 7.4
Curing of applied adhesive according to 8.1
Determination of reference values according to 8.2
Exposure according to 8.3
Conditioning of test panels according to 8.3
Test procedure according to 9.1 according to 9.2 according to 9.3
Expression of results according to 10.1 according to 10.2 according to 10.3
7 Preparation of specimens
7.1 Preparation of test panels
Pretreat the substrate to be bonded as agreed between the interested parties (clean with suitable
solvent and apply activator/primer, if applicable).
Store the coated test panels (5.1.1, 5.2.1 or 5.3.1) at (23 ± 2) °C and (50 ± 5) % relative humidity in
accordance with ISO 3270. The time between completion of the coating and application of the adhesive
shall be indicated in the test report.
NOTE The adhesive strength of the adhesive can depend on this time span.
Temper the adhesive as indicated by the manufacturer.
7.2 Adhesive strength test method A — Peel adhesion
7.2.1 Bead shape
Cut the nozzle to the base and height of the bead according to the agreed bead shape (round or triangular
bead), for example as shown in Figures 2 and 3.
Dimensions in millimetres
a) Cross section b) Cut nozzle tip
(lateral view)
Figure 2 — Round bead
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Dimensions in millimetres
a) Cross section b) Cut nozzle tip
(front view)
Figure 3 — Triangular bead
For the purpose of paired measurement, apply 2 beads of the appropriately tempered adhesive parallel
to each other to the test panel prepared in accordance with 7.1.
Usually, exposures are conducted simultaneously, i.e. one reference test on one pair of beads and only
one exposure each.
For elastic bonds, e.g. of windscreens where a clearance of approximately 5 mm is required, a typical
bead geometry may be as follows:
Bead length approximately 180 mm
Bead base (8 ± 2) mm
Bead height (12 ± 2) mm
When combining several ageing tests on one pair of beads (sequential testing), the sequence, conditions
and conditioning between the individual exposures shall be specified for each ageing test. The bead
shall be long enough to provide a length of about 5 cm for reference purposes and for each test.
7.2.2 Application of the adhesive bead
7.2.2.1 Application to the coating, curing without pressing
This method allows quick execution (“screening”) by applying round beads directly to the coating thus
causing them to cure faster due to the lack of a vapour barrier. Testing may also be conducted on uneven
surfaces of original parts.
Following cleaning and application of the pretreatment layer, adhesive tape may be applied to one of
the shorter sides of the test panel. This will later facilitate initial lifting of the adhesive bead. As an
alternative, the bead may initially be cut to peel it off the coating.
During bead application, the nozzle tip shall be placed carefully on the substrate without damaging
the surface. If damage cannot be excluded, application is done near to the surface without touching it.
For this purpose, the drawing speed of the application gun and the adhesive discharge rate shall be
coordinated such as to neither stretch nor compress the adhesive in order to ensure a uniformly good
contact with the substrate surface.
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As an alternative, beads of any geometry may be applied to test areas defined by taping; excess material
may be removed by means of a shaping doctor blade. See Figure 4.
Dimensions in millimetres
Key
1 one strip of adhesive tape
2 three strips of adhesive tape
3 adhesive bead
Figure 4 — Application of two adhesive beads directly to the coating
7.2.2.2 Application to the coating including pressing
The advantage of applying the adhesive bead directly to the coating including pressing is that this
ensures good contact of the adhesive with the surface. This is the method most commonly used by
laboratories. This specimen preparation simulates the curing process under real conditions where
curing will occur from two sides. A typical example is the bonding of panes.
Following the cleaning and the application of the pretreatment layer, adhesive tape may be applied to
one of the shorter sides of the test panel. This will later facilitate initial lifting of the adhesive bead. As
an alterna
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