ISO 24068-1:2021
(Main)Building and civil engineering sealants — Determination of the degree of cure — Part 1: Build-up of tensile properties in dumbbell-shaped specimens
Building and civil engineering sealants — Determination of the degree of cure — Part 1: Build-up of tensile properties in dumbbell-shaped specimens
This document specifies a method for the determination of the degree of cure of one- and multi-component sealants as indicated by the build-up of the tensile properties in dumbbell-shaped specimens during cure.
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INTERNATIONAL ISO
STANDARD 24068-1
First edition
2021-05
Building and civil engineering
sealants — Determination of the
degree of cure —
Part 1:
Build-up of tensile properties in
dumbbell-shaped specimens
Reference number
ISO 24068-1:2021(E)
©
ISO 2021
---------------------- Page: 1 ----------------------
ISO 24068-1:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 24068-1:2021(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus and materials. 1
6 Conditioning . 2
7 Preparation of test specimen . 2
8 Test procedure . 3
9 Calculation and expression of test result . 3
9.1 Tensile stress . 3
9.2 Tensile strength . 3
9.3 Degree of cure . 4
9.4 Rounding of results . 4
10 Test report . 4
Bibliography . 6
© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 24068-1:2021(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 59, Buildings and civil engineering works,
Subcommittee SC 8, Sealants.
A list of all parts in the ISO 24068 series can be found on the ISO website.
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 2021 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 24068-1:2021(E)
Building and civil engineering sealants — Determination of
the degree of cure —
Part 1:
Build-up of tensile properties in dumbbell-shaped
specimens
1 Scope
This document specifies a method for the determination of the degree of cure of one- and multi-
component sealants as indicated by the build-up of the tensile properties in dumbbell-shaped specimens
during cure.
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 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 5893, Rubber and plastics test equipment — Tensile, flexural and compression types (constant rate of
traverse) — Specification
ISO 6927, Building and civil engineering sealants — Vocabulary
ISO 80000-1:2009, Quantities and units — Part 1: General
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6927 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/
4 Principle
The degree of cure of a dumbbell-shaped test specimen of a (ambient temperature curing) sealant
is determined as the ratio between the value of engineering tensile stress (secant modulus), or
maximum tensile strength at any time during cure, and the corresponding value measured after a
reference cure period.
5 Apparatus and materials
5.1 Tensile-testing machine with recording device, conforming to ISO 5893 (force class 2 as defined
in ISO 7500-1, corresponding to a maximum permissible value of accuracy of ±2 %). The accuracy class
© ISO 2021 – All rights reserved 1
---------------------- Page: 5 ----------------------
ISO 24068-1:2021(E)
for elongation shall be class D. An appropriate load cell of suitable sensitivity for the sealants to be tested
shall be used.
It shall be possible to set the tensile-testing machine at one or more of the following rates of displacement
of the driven grip: (100 ± 10) mm/min, (200 ± 20) mm/
...
INTERNATIONAL ISO
STANDARD 24068-1
First edition
Building and civil engineering
sealants — Determination of the
degree of cure —
Part 1:
Build-up of tensile properties in
dumbbell-shaped specimens
PROOF/ÉPREUVE
Reference number
ISO 24068-1:2021(E)
©
ISO 2021
---------------------- Page: 1 ----------------------
ISO 24068-1:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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.org
Published in Switzerland
ii PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 24068-1:2021(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus and materials. 1
6 Conditioning . 2
7 Preparation of test specimen . 2
8 Test procedure . 3
9 Calculation and expression of test result . 3
9.1 Tensile stress . 3
9.2 Tensile strength . 3
9.3 Degree of cure . 4
9.4 Rounding of results . 4
10 Test report . 4
Bibliography . 6
© ISO 2021 – All rights reserved PROOF/ÉPREUVE iii
---------------------- Page: 3 ----------------------
ISO 24068-1:2021(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 59, Buildings and civil engineering works,
Subcommittee SC 8, Sealants.
A list of all parts in the ISO 24068 series can be found on the ISO website.
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 PROOF/ÉPREUVE © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 24068-1:2021(E)
Building and civil engineering sealants — Determination of
the degree of cure —
Part 1:
Build-up of tensile properties in dumbbell-shaped
specimens
1 Scope
This document specifies a method for the determination of the degree of cure of one- and multi-
component sealants as indicated by the build-up of the tensile properties in dumbbell-shaped specimens
during cure.
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 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 5893, Rubber and plastics test equipment — Tensile, flexural and compression types (constant rate of
traverse) — Specification
ISO 6927, Buildings and civil engineering works — Sealants — Vocabulary
ISO 80000-1:2009, Quantities and units — Part 1: General
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 6927 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/
4 Principle
The degree of cure of a dumbbell-shaped test specimen of a (ambient temperature curing) sealant
is determined as the ratio between the value of engineering tensile stress (secant modulus), or
maximum tensile strength at any time during cure, and the corresponding value measured after a
reference cure period.
5 Apparatus and materials
5.1 Tensile-testing machine with recording device, conforming to ISO 5893 (force class 2 as defined
in ISO 7500-1, corresponding to a maximum permissible value of accuracy of ±2 %). The accuracy class
© ISO 2021 – All rights reserved PROOF/ÉPREUVE 1
---------------------- Page: 5 ----------------------
ISO 24068-1:2021(E)
for elongation shall be class D. An appropriate load cell of suitable sensitivity for the sealants to be tested
shall be used.
It shall be possible to set the tensile-testing machine at one or more of the following rates of displacement
of the driven grip: (100 ± 10) mm/min, (200 ± 20) mm/min an
...
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