ISO 7972:2023

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 7972
ISO/TC 61/SC 11
Adhesives — Absorption of water into
Secretariat: JISC
an adhesive layer using an open-faced
Voting begins on:
2023-02-20 specimen and determination of shear
strength by secondary bonding
Voting terminates on:
2023-04-17
Adhésifs — Absorption d'eau dans une couche adhésive au moyen
d'un échantillon ouvert et détermination de la résistance au
cisaillement par collage secondaire
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 7972:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 1 ----------------------
ISO/FDIS 7972:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 7972
ISO/TC 61/SC 11
Adhesives — Absorption of water into
Secretariat: JISC
an adhesive layer using an open-faced
Voting begins on:
specimen and determination of shear
strength by secondary bonding
Voting terminates on:
Adhésifs — Absorption d'eau dans une couche adhésive au moyen
d'un échantillon ouvert et détermination de la résistance au
cisaillement par collage secondaire
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 7972:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 2 ----------------------
ISO/FDIS 7972:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Test specimens . 2
6.1 Open­faced specimen . 2
6.1.1 Cleaning . 2
6.1.2 Surface treatment . 2
6.1.3 Deposition and control of the adhesive thickness . 2
6.1.4 Immersion in water. 3
6.2 Specimen for single lap shear test . 3
6.2.1 Dimensions and alignment . 3
6.2.2 Number of specimens . 3
6.3 Accuracy . 3
7 Conditioning of test . 4
8 Procedure .4
8.1 Immersion in water . 4
8.2 Secondary bonding . 4
8.3 Tensile shear test . 4
9 Precision data .4
10 Calculation and expression of results . 5
11 Test report . 5
Annex A (informative) Example of preparation of open-faced specimen . 6
Annex B (informative) Example of secondary bonding . 8
Bibliography .10
iii
© ISO 2023 – All rights reserved

---------------------- Page: 3 ----------------------
ISO/FDIS 7972:2023(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 non­governmental, 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 61, Plastics, Subcommittee SC 11,
Products.
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 2023 – All rights reserved

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ISO/FDIS 7972:2023(E)
Introduction
Adhesives absorb moisture from the environment over a long period of time. The absorbed water often
decreases the strength of the adhesive. Therefore, it is important to evaluate the effect of absorbed
water properly to ensure the durability of adhesive bonding joints. Such an evaluation is generally time-
consuming because the penetration of water into the adhesive layer is a slow process. Additionally, the
moisture in the adhesive layer can alter the chemical and physical properties of the adhesive layer and
interface over time.
v
© ISO 2023 – All rights reserved

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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 7972:2023(E)
Adhesives — Absorption of water into an adhesive layer
using an open-faced specimen and determination of shear
strength by secondary bonding
1 Scope
This document specifies a method for the rapid permeation of water to an adhesive layer using a
specimen with one side open, the secondary bonding the specimens with the adhesive layer that is
still moistened, and a shear strength test of the secondary bonded specimen, for the selection of water-
resistant adhesives and the determination of suitable surface treatments. It does not assess the water
resistance of the actual joint itself, as the distribution of water in the adhesive layer is different. This
test procedure does not provide design information.
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 175, Plastics — Methods of test for the determination of the effects of immersion in liquid chemicals
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 472, Plastics — Vocabulary
ISO 4587, Adhesives — Determination of tensile lap-shear strength of rigid-to-rigid bonded assemblies
ISO 10365, Adhesives — Designation of main failure patterns
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at
...

ISO/XX FDIS 7972:2023(E)
ISO TC61/SC 11/WG 5
Secretariat: JISC
Date: 2022-12-232023-02-06
Adhesives — Absorption of water into an adhesive layer using an open-faced specimen and
determination of shear strength by secondary bonding

---------------------- Page: 1 ----------------------
ISO/FDIS 7972:2023(E)
© ISO 20222023
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
Email: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
ii © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 7972:2023(E)
Contents
Foreword . Error! Bookmark not defined.
Introduction . Error! Bookmark not defined.
1 Scope . Error! Bookmark not defined.
2 Normative references . Error! Bookmark not defined.
3 Terms and definitions . Error! Bookmark not defined.
4 Principle . Error! Bookmark not defined.
5 Apparatus . Error! Bookmark not defined.
5.1 Linear measuring device . Error! Bookmark not defined.
5.2 Beakers, enclosures, the thermometer, and the ventilated ovensError! Bookmark not defined.
5.3 Tensile-testing machine . Error! Bookmark not defined.
6 Test specimens . Error! Bookmark not defined.
6.1 Open-faced specimen . Error! Bookmark not defined.
6.1.1 Dimension and deposition . Error! Bookmark not defined.
6.1.2 Layer thickness . Error! Bookmark not defined.
6.1.3 Surface treatment . Error! Bookmark not defined.
6.1.4 Cleaning and immersion in water . Error! Bookmark not defined.
6.2 Specimen for single lap shear test . Error! Bookmark not defined.
6.2.1 Dimensions and alignment . Error! Bookmark not defined.
6.2.2 Number of specimens . Error! Bookmark not defined.
6.3 Accuracy . Error! Bookmark not defined.
7 Conditioning of test . Error! Bookmark not defined.
8 Procedure . Error! Bookmark not defined.
8.1 Immersion in water . Error! Bookmark not defined.
8.2 Secondary bonding . Error! Bookmark not defined.
8.3 The tensile shear test . Error! Bookmark not defined.
9 Precision data . Error! Bookmark not defined.
10 Calculation and expression of results . Error! Bookmark not defined.
11 Test report . Error! Bookmark not defined.
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
6 Test specimens . 2
6.1 Open-faced specimen . 2
© ISO 2023 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO/FDIS 7972:2023(E)
6.1.1 Cleaning . 2
6.1.2 Surface treatment . 3
6.1.3 Deposition and control of the adhesive thickness . 3
6.1.4 Immersion in water . 3
6.2 Specimen for single lap shear test . 4
6.2.1 Dimensions and alignment . 4
6.2.2 Number of specimens . 4
6.3 Accuracy . 4
7 Conditioning of test . 5
8 Procedure. 5
8.1 Immersion in water . 5
8.2 Secondary bonding . 5
8.3 Tensile shear test . 5
9 Precision data . 5
10 Calculation and expression of results . 6
11 Test report . 6
Annex A (informative) Example of preparation of open-faced specimen . 7
Annex B (informative) Example of secondary bonding . 10
Bibliography . 14


iv © ISO 2023 – All rights reserved

---------------------- Page: 4 ----------------------
ISO/FDIS 7972:2023(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/directiveswww.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/patentswww.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.htmlwww.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 11,
Products.
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.htmlwww.iso.org/members.html.
© ISO 2023 – All rights reserved v

---------------------- Page: 5 ----------------------
ISO/FDIS 7972:2023(E)
Introduction
Adhesives absorb moisture from the environment over a long period of time. The absorbed water often
decreases the strength of the adhesive. Therefore, it is important to evaluate the effect of absorbed
water properly to ensure the durability of adhesive bonding joints. Such an evaluation is generally time-
consuming because the penetration of water into the adhesive layer is a slow process. Additionally, over
time, the moisture in the adhesive layer can alter the chemical and physical properties of the adhesive
layer and interface over time.
vi © ISO 2023 – All rights reserved

---------------------- Page: 6 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 7972:2023(E)

Adhesives — Absorption of water into an adhesive layer using an
open-faced specimen and determination of shear strength by
secondary bonding
1 Scope
This document specifies a method for the rapid permeation of water to an adhesive layer using a
specimen with one side open, the secondary bonding the specimens with the adhesive layer that is still
moistened, and a shear strength test of the secondary bonded specimen, for the selection of water-
resistant adhesives and the determination of suitable surface treatments. It does not assess the water
resistance of the actual joint itself, as the distribution of water in the adhesive layer is different. This
test procedure does not provide design information.
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 175, Plastics — Methods of test for the determination of the effects of immersion in liquid chemicals
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 472, Plastics — Vocabulary
ISO 4587, Adhesives — Determination of tensile lap-shear strength of rigid-to-rigid bonded assemblies
ISO 4588, Adhesives — Guidelines for the surface preparation of metals
ISO 10365, Adhesives — Designation of main failure patterns
ISO 13895, Adhesives — Guidelines for the surface preparation of plastics
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 472 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/obphttps://www.iso.org/obp
— IEC Ele
...