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)

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

Status
Published
Public Enquiry End Date
01-Oct-2020
Publication Date
27-Jan-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
11-Jan-2021
Due Date
18-Mar-2021
Completion Date
28-Jan-2021

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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

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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.

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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.

© ISO 2019 – All rights reserved 5
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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
...

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