Elastomeric seals — Requirements for materials for pipe joint seals used in water and drainage applications — Thermoplastic elastomers

This document specifies requirements for materials used for moulded seals made of thermoplastic elastomers (TPEs) for joints in: a) thermoplastic piping systems for non-pressure wastewater discharge (intermittent flow at up to 95 °C) inside buildings; b) thermoplastic piping systems for non-pressure underground drainage and sewerage (continuous flow at up to 45 °C and intermittent flow at up to 95 °C); c) thermoplastic rainwater piping systems. General requirements for finished joint seals are also given; any additional requirements for a particular application are specified in the relevant product standards taking into account that the performance of pipe joints is a function of the seal material properties, seal geometry and pipe joint design.

Garnitures d'étanchéité en caoutchouc — Spécification des matériaux pour garnitures d'étanchéité utilisées dans le domaine de l'eau et du drainage — Élastomères thermoplastiques

General Information

Status
Published
Publication Date
13-Oct-2022
Current Stage
6060 - International Standard published
Due Date
31-Oct-2022
Completion Date
14-Oct-2022
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ISO 23711:2022 - Elastomeric seals — Requirements for materials for pipe joint seals used in water and drainage applications — Thermoplastic elastomers Released:14. 10. 2022
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INTERNATIONAL ISO
STANDARD 23711
Second edition
2022-10
Elastomeric seals — Requirements
for materials for pipe joint seals used
in water and drainage applications —
Thermoplastic elastomers
Garnitures d'étanchéité en caoutchouc — Spécification des matériaux
pour garnitures d'étanchéité utilisées dans le domaine de l'eau et du
drainage — Élastomères thermoplastiques
Reference number
ISO 23711:2022(E)
© ISO 2022
---------------------- Page: 1 ----------------------
ISO 23711:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

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

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or ISO’s member body in the country of the requester.
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Published in Switzerland
© ISO 2022 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 23711:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 2

4 Classification ............................................................................................................................................................................................................ 2

5 Finished-seal requirements ..................................................................................................................................................................... 2

5.1 Dimensional tolerances .................................................................................................................................................................. 2

5.2 Imperfections and defects ............................................................................................................................................................ 2

5.3 Hardness ...................................................................................................................................................................................................... 3

5.4 Tensile strength and elongation at break ....................................................................................................................... 3

5.5 Compression set in air...................................................................................................................................................................... 3

5.5.1 General ........................................................................................................................................................................................ 3

5.5.2 Compression set at 23 °C and 70 °C ................................................................................................................... 3

5.5.3 Low temperature compression set at −10 °C ............................................................................................. 3

5.6 Accelerated ageing in air ............................................................................................................................................................... 3

5.7 Stress relaxation in compression ........................................................................................................................................... 3

5.8 Stress fall ..................................................................................................................................................................................................... 4

5.9 Volume change in water ................................................................................................................................................................. 5

5.10 Ozone resistance ................................................................................................................................................................................... 5

5.11 Change in volume in oil [for type WH only (see Table 3)] ................................................................................ 6

6 Test pieces and temperature ..................................................................................................................................................................7

6.1 Preparation of test pieces ............................................................................................................................................................. 7

6.2 Test temperature .................................................................................................................................................................................. 7

7 Quality assurance ............................................................................................................................................................................................... 7

8 Storage ............................................................................................................................................................................................................................ 7

9 Designation ................................................................................................................................................................................................................ 7

10 Marking and labelling .................................................................................................................................................................................... 8

Annex A (informative) Quality assurance ...................................................................................................................................................... 9

Annex B (informative) Guidance on storage of seals .......................................................................................................................10

Bibliography .............................................................................................................................................................................................................................11

iii
© ISO 2022 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 23711:2022(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 45, Rubber and rubber products,

Subcommittee SC 4, Products (other than hoses).

This second edition cancels and replaces the first edition (ISO 23711:2003), which has been technically

revised.
The main changes are as follows:
— the tensile test has been changed so that it is performed in two directions;
— the ageing has been made more severe;
— a new test on stress fall has been added.

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
© ISO 2022 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 23711:2022(E)
Elastomeric seals — Requirements for materials for pipe
joint seals used in water and drainage applications —
Thermoplastic elastomers
1 Scope

This document specifies requirements for materials used for moulded seals made of thermoplastic

elastomers (TPEs) for joints in:

a) thermoplastic piping systems for non-pressure wastewater discharge (intermittent flow at up to

95 °C) inside buildings;

b) thermoplastic piping systems for non-pressure underground drainage and sewerage (continuous

flow at up to 45 °C and intermittent flow at up to 95 °C);
c) thermoplastic rainwater piping systems.

General requirements for finished joint seals are also given; any additional requirements for a particular

application are specified in the relevant product standards taking into account that the performance of

pipe joints is a function of the seal material properties, seal geometry and pipe joint design.

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 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between

10 IRHD and 100 IRHD

ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests

ISO 815-1, Rubber, vulcanized or thermoplastic — Determination of compression set — Part 1: At ambient

or elevated temperatures

ISO 815-2, Rubber, vulcanized or thermoplastic — Determination of compression set — Part 2: At low

temperatures

ISO 1431-1, Rubber, vulcanized or thermoplastic — Resistance to ozone cracking — Part 1: Static and

dynamic strain testing

ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids

ISO 3302-1, Rubber — Tolerances for products — Part 1: Dimensional tolerances

ISO 3384-1:2019, Rubber, vulcanized or thermoplastic — Determination of stress relaxation in compression

— Part 1: Testing at constant temperature

ISO 6914:2021, Rubber, vulcanized or thermoplastic — Determination of ageing characteristics by

measurement of stress relaxation in tension

ISO 9691:1992, Rubber — Recommendations for the workmanship of pipe joint rings — Description and

classification of imperfections
© ISO 2022 – All rights reserved
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ISO 23711:2022(E)

ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test

methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminology databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
thermoplastic elastomer

polymer or blend of polymers that does not require vulcanization or cross-linking during processing,

yet has elastic properties at its service temperature

Note 1 to entry: These properties disappear at processing temperature, so that further processing is possible, but

return when the material is returned to its service temperature.
4 Classification
A nominal hardness of materials shall be specified within the ranges in Table 1.
Table 1 — Hardness classification
Hardness class 50 60 70
Range of hardness, IRHD 46 to 55 56 to 65 66 to 75
5 Finished-seal requirements
5.1 Dimensional tolerances
Tolerances shall be specified from the appropriate classes in ISO 3302-1.
5.2 Imperfections and defects

The seals shall be free of defects or irregularities, which could affect their function. Classification of

imperfections shall be according to ISO 9691 as follows:

— surface imperfections in zones involved in the sealing function as described in ISO 9691:1992, 4.1.1

shall be considered as defects;

— surface imperfections in zones not involved in the sealing function as described in ISO 9691:1992,

4.1.2.1 b) shall not be considered as defects.

Major surface imperfections in zones not involved in the sealing function as described in ISO 9691:1992,

4.1.2.1 a), may be considered as defects. This should be agreed between the interested parties; the

acceptance criteria depend upon the seal type or design.

Internal imperfections as described in ISO 9691:1992, 4.2 may be considered as defects. The

compressive force can be determined in accordance with ISO 7743. The acceptable limiting values of

the compressive force should be agreed between the interested parties; they depend upon the seal type

or design.
© ISO 2022 – All rights reserved
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ISO 23711:2022(E)
5.3 Hardness

When determined by the microtest method specified in ISO 48-2, on samples prepared in accordance

with 6.1, the hardness shall conform to the requirements given in Table 2.

If the dimensions of a seal are appropriate, the normal test method specified in ISO 48-2 may be used,

provided that the microtest method i
...

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