ISO 9631:2018
(Main)Rubber seals — Joint rings for pipelines for hot-water supply up to 110 °C — Specification for the material
Rubber seals — Joint rings for pipelines for hot-water supply up to 110 °C — Specification for the material
ISO 9631:2018 specifies material requirements for vulcanized rubber seals for hot drinking and non-drinking water supply (up to 110 °C). The different seal designations specified are defined according to seal type, seal application and the requirements for a particular seal (see Table 2). General requirements for finished joint seals are also given. Any additional requirements called for by the 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. This document is intended to be used where appropriate, in conjunction with product standards which specify performance requirements for joints. ISO 9631:2018 is applicable to joint seals for use with all pipeline materials, including metals, clay, fibre cement, concrete, reinforced concrete, plastics and glass-reinforced plastics. ISO 9631:2018 is applicable to elastomeric components of composite and non-composite seals. In the case of composite seals made from materials with hardness ranging from 76 IRHD to 95 IRHD, the requirements for elongation at break, compression set and stress relaxation apply only when the material participates in the sealing function or contributes to the long-term stability of the seal. The material requirements specified in this document are designed for long term performances and a potential lifetime of 50 years. The lifetime of a sealing depends not only on material performance but also on other parameters which are not defined in this document like the mounting design, the quality of assembly and the combination with operating conditions. Joint rings made from cellular rubber materials are not covered by this document.
Joints étanches en caoutchouc — Garnitures d'étanchéité destinées aux joints de canalisations pour la fourniture d'eau chaude jusqu'à 110 °C — Spécifications pour les matériaux
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INTERNATIONAL ISO
STANDARD 9631
Third edition
2018-03
Rubber seals — Joint rings for
pipelines for hot-water supply up to
110 °C — Specification for the material
Joints étanches en caoutchouc — Garnitures d'étanchéité destinées
aux joints de canalisations pour la fourniture d'eau chaude jusqu'à
110 °C — Spécifications pour les matériaux
Reference number
©
ISO 2018
© ISO 2018
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 2018 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 2
5 Requirements and test methods . 3
5.1 Requirements for material . . 3
5.1.1 General. 3
5.1.2 Effect on water quality . 7
5.2 Requirement for finished seals . 7
5.2.1 Dimensional tolerances. 7
5.2.2 Imperfections and defects . 7
5.2.3 Hardness . 7
5.2.4 Tensile strength and elongation at break . 7
5.2.5 Compression set in air . 7
5.2.6 Accelerated ageing in air . 8
5.2.7 Stress relaxation . 8
5.2.8 Volume change in water . 8
5.2.9 Ozone resistance . 8
5.2.10 Tear strength . 9
5.2.11 Compression set in water . 9
5.2.12 Splices of prevulcanized profile ends . 9
6 Testing . 9
6.1 Preparation of test pieces . 9
6.2 Test temperature .10
7 Quality assurance .10
8 Storage .10
9 Designation .10
10 Marking and labelling .10
Annex A (normative) Determination of splice strength .11
Annex B (normative) Determination of compression set in hot water at 110 °C for seals.12
Annex C (informative) Quality assurance .14
Annex D (informative) Guidance on storage of seals .15
Bibliography .16
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 on 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 the following
URL: 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 third edition cancels and replaces the second edition (ISO 9631:2003), which has been technically
revised.
The main changes compared to the previous edition are as follows.
— Three different temperature classes (T1, T2 and T3) have been introduced. The requirements for
the lowest class (T1) are similar to the requirements in the second edition of this standard, while
classes T2 and T3 have been added in Table 2 to specify more severe requirements in order to deal
with more demanding applications.
— The test procedure for the hot water compression set (Annex B) has been revised to be more in line
with experiences over the last years.
iv © ISO 2018 – All rights reserved
INTERNATIONAL STANDARD ISO 9631:2018(E)
Rubber seals — Joint rings for pipelines for hot-water
supply up to 110 °C — Specification for the material
WARNING — Persons using this document should be familiar with normal laboratory practice.
This standard does not purport to address all of the safety problems, if any, associated with its
use. It is the responsibility of the user to establish appropriate safety and health practices.
1 Scope
This document specifies material requirements for vulcanized rubber seals for hot drinking and non-
drinking water supply (up to 110 °C).
The different seal designations specified are defined according to seal type, seal application and the
requirements for a particular seal (see Table 2).
General requirements for finished joint seals are also given. Any additional requirements called for by
the 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. This document is intended to be used where appropriate, in conjunction with product standards
which specify performance requirements for joints.
This document is applicable to joint seals for use with all pipeline materials, including metals, clay, fibre
cement, concrete, reinforced concrete, plastics and glass-reinforced plastics.
It is applicable to elastomeric components of composite and non-composite seals. In the case of composite
seals made from materials with hardness ranging from 76 IRHD to 95 IRHD, the requirements for
elongation at break, compression set and stress relaxation apply only when the material participates in
the sealing function or contributes to the long-term stability of the seal.
The material requirements specified in this document are designed for long term performances and a
potential lifetime of 50 years. The lifetime of a sealing depends not only on material performance but
also on other parameters which are not defined in this document like the mounting design, the quality
of assembly and the combination with operating conditions. Joint rings made from cellular rubber
materials are not covered by this document.
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 34-2, Rubber, vulcanized or thermoplastic — Determination of tear strength — Part 2: Small (Delft)
test pieces
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and
100 IRHD)
ISO 188:2011, 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 1431-1, Rubber, vulcanized or thermoplastic — Resistance to ozone cracking — Part 1: Static and
dynamic strain testing
ISO 1629, Rubber and latices — Nomenclature
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 3302-1, Rubber — Tolerances for products — Part 1: Dimensional tolerances
ISO 3384-1:2011, Rubber, vulcanized or thermoplastic — Determination of stress relaxation in
compression — Part 1: Testing at constant temperature
ISO 6914:2013, 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 10508:2006, Plastics piping systems for hot and cold water installations — Guidance for classification
and design
ISO 15510, Stainless steels — Chemical composition
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Terms and definitions
No terms and definitions are li
...
INTERNATIONAL ISO
STANDARD 9631
Third edition
2018-03
Rubber seals — Joint rings for
pipelines for hot-water supply up to
110 °C — Specification for the material
Joints étanches en caoutchouc — Garnitures d'étanchéité destinées
aux joints de canalisations pour la fourniture d'eau chaude jusqu'à
110 °C — Spécifications pour les matériaux
Reference number
©
ISO 2018
© ISO 2018
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 2018 – All rights reserved
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 2
5 Requirements and test methods . 3
5.1 Requirements for material . . 3
5.1.1 General. 3
5.1.2 Effect on water quality . 7
5.2 Requirement for finished seals . 7
5.2.1 Dimensional tolerances. 7
5.2.2 Imperfections and defects . 7
5.2.3 Hardness . 7
5.2.4 Tensile strength and elongation at break . 7
5.2.5 Compression set in air . 7
5.2.6 Accelerated ageing in air . 8
5.2.7 Stress relaxation . 8
5.2.8 Volume change in water . 8
5.2.9 Ozone resistance . 8
5.2.10 Tear strength . 9
5.2.11 Compression set in water . 9
5.2.12 Splices of prevulcanized profile ends . 9
6 Testing . 9
6.1 Preparation of test pieces . 9
6.2 Test temperature .10
7 Quality assurance .10
8 Storage .10
9 Designation .10
10 Marking and labelling .10
Annex A (normative) Determination of splice strength .11
Annex B (normative) Determination of compression set in hot water at 110 °C for seals.12
Annex C (informative) Quality assurance .14
Annex D (informative) Guidance on storage of seals .15
Bibliography .16
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 on 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 the following
URL: 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 third edition cancels and replaces the second edition (ISO 9631:2003), which has been technically
revised.
The main changes compared to the previous edition are as follows.
— Three different temperature classes (T1, T2 and T3) have been introduced. The requirements for
the lowest class (T1) are similar to the requirements in the second edition of this standard, while
classes T2 and T3 have been added in Table 2 to specify more severe requirements in order to deal
with more demanding applications.
— The test procedure for the hot water compression set (Annex B) has been revised to be more in line
with experiences over the last years.
iv © ISO 2018 – All rights reserved
INTERNATIONAL STANDARD ISO 9631:2018(E)
Rubber seals — Joint rings for pipelines for hot-water
supply up to 110 °C — Specification for the material
WARNING — Persons using this document should be familiar with normal laboratory practice.
This standard does not purport to address all of the safety problems, if any, associated with its
use. It is the responsibility of the user to establish appropriate safety and health practices.
1 Scope
This document specifies material requirements for vulcanized rubber seals for hot drinking and non-
drinking water supply (up to 110 °C).
The different seal designations specified are defined according to seal type, seal application and the
requirements for a particular seal (see Table 2).
General requirements for finished joint seals are also given. Any additional requirements called for by
the 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. This document is intended to be used where appropriate, in conjunction with product standards
which specify performance requirements for joints.
This document is applicable to joint seals for use with all pipeline materials, including metals, clay, fibre
cement, concrete, reinforced concrete, plastics and glass-reinforced plastics.
It is applicable to elastomeric components of composite and non-composite seals. In the case of composite
seals made from materials with hardness ranging from 76 IRHD to 95 IRHD, the requirements for
elongation at break, compression set and stress relaxation apply only when the material participates in
the sealing function or contributes to the long-term stability of the seal.
The material requirements specified in this document are designed for long term performances and a
potential lifetime of 50 years. The lifetime of a sealing depends not only on material performance but
also on other parameters which are not defined in this document like the mounting design, the quality
of assembly and the combination with operating conditions. Joint rings made from cellular rubber
materials are not covered by this document.
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 34-2, Rubber, vulcanized or thermoplastic — Determination of tear strength — Part 2: Small (Delft)
test pieces
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and
100 IRHD)
ISO 188:2011, 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 1431-1, Rubber, vulcanized or thermoplastic — Resistance to ozone cracking — Part 1: Static and
dynamic strain testing
ISO 1629, Rubber and latices — Nomenclature
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 3302-1, Rubber — Tolerances for products — Part 1: Dimensional tolerances
ISO 3384-1:2011, Rubber, vulcanized or thermoplastic — Determination of stress relaxation in
compression — Part 1: Testing at constant temperature
ISO 6914:2013, 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 10508:2006, Plastics piping systems for hot and cold water installations — Guidance for classification
and design
ISO 15510, Stainless steels — Chemical composition
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Terms and definitions
No terms and definitions are li
...
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