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

General Information

Status
Published
Publication Date
05-Mar-2018
Current Stage
6060 - International Standard published
Start Date
13-Feb-2018
Completion Date
06-Mar-2018
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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 9631:2018(E)
ISO 2018
---------------------- Page: 1 ----------------------
ISO 9631:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
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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
---------------------- Page: 2 ----------------------
ISO 9631:2018(E)
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

© ISO 2018 – All rights reserved iii
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ISO 9631:2018(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 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
---------------------- Page: 4 ----------------------
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 2018 – All rights reserved 1
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ISO 9631:2018(E)
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 listed in this document.

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

— IEC Electropedia: available at https:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
4 Classification

4.1 Materials for pipe joint seals are classified based on their nominal hardness. A nominal hardness

shall be specified within the ranges in Table 1.
Table 1 — Hardness classification
Hardness class 50 60 70 80 90
Range of hardness, IRHD 46 to 55 56 to 65 66 to 75 76 to 85 86 to 95

4.2 On top of that, three classes for the use of the materials are specified in Table 2.

Table 2 — Classes and designation of elastomeric joint seals by type, application and

requirements
Class Application Requirements Subclause
Tables 3 and 4
Hot water systems where the temperature is high (up to 85 °C)
T1 5.1.2
during tapping and low (ambient) when no water is used.
(Effect on water quality)
Tables 5 and 6
Hot water circulation systems based on the classification class
T2 5.1.2
2 in ISO 10508:2006
(Effect on water quality)
Tables 7 and 8
District heating, secondary systems with hot water circulation
T3 5.1.2
between 75 °C and 95 °C
(Effect on water quality)
T3 is based on EN 253.
2 © ISO 2018 – All rights reserved
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ISO 9631:2018(E)

A material of one type qualified for one class is automatically qualified for the inferior class.

4.3 Furthermore a difference is made for two types of sealing principle:

— Type A: Seals based on EPM, EPDM, NBR, SBR or equivalent polymers as typical materials;

— Type B: Seals based on IIR, CIIR or BIIR (butylic rubbers) or equivalent as typical materials.

4.4 If products are intended for drinking water, the letter D is added to the designation.

5 Requirements and test methods
5.1 Requirements for material
5.1.1 General

Requirements are summarized in Tables 3, 4, 5, 6, 7 and 8 for each class. The material shall be free of

any substances which could have a deleterious effect on the water transported, or on the life of the

sealing ring, or on the pipe or fitting. Elastomeric components of composite seals not exposed to the

contents of the pipeline are not required to meet the requirements of 5.1.2.

Table 3 — Physical-property requirements for type A materials used in class T1 applications

Property Unit Test Sub- Requirements for hardness classes
method clause 50 60 70 80 90
Permissible tolerance on nomi-
IRHD ISO 48 5.2.3 ±5 ±5 ±5 ±5 ±5
nal hardness
Tensile strength, min. MPa ISO 37 5.2.4 9 9 9 9 9
Elongation at break, min. % ISO 37 5.2.4 250 200 150 100 100
Compression set, max.
% ISO 815-1 5.2.5.2
72 h at 23 °C 15 15 15 15 15
% ISO 815-1 5.2.5.2
24 h at 125 °C 20 20 20 20 20
Ageing, 7 days at 125 °C ISO 188 5.2.6
IRHD
Hardness change, max. ISO 48 +8/–5 +8/–5 +8/–5 +8/–5 +8/–5
Tensile strength change, max. ISO 37 –20 –20 –20 –20 –20
Elongation change, max. ISO 37 +10/–30 +10/–30 +10/–30 +10/–40 +10/–40
Stress relaxation, max % ISO 3384-1 5.2.7
7 days at 23 °C or 15 15 15 18 18
7 days at 125 °C ISO 6914 30 30 30 30 30
Volume change in water, max. % ISO 1817 5.2.8
+8/–1 +8/–1 +8/–1 +8/–1 +8/–1
7 days at 95 °C

Ozone resistance — ISO 1431-1 5.2.9 No cracking when viewed without magnification

Tear strength, min. N ISO 34-2 5.2.10 20 20 20 20 20
© ISO 2018 – All rights reserved 3
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ISO 9631:2018(E)

Table 4 — Physical-property requirements for type B materials used in class T1 applications

Property Unit Test method Sub- Requirements for hardness classes
clause 50 60 70 80
Permissible tolerance on nomi-
IRHD ISO 48 5.2.3 ±5 ±5 ±5 ±5
nal hardness
Tensile strength, min. MPa ISO 37 5.2.4 9 9 9 9
Elongation at break, min. % ISO 37 5.2.4 250 200 150 100
Compression set, max.
% ISO 815-1 5.2.5.2
72 h at 23 °C 15 15 15 15
% ISO 815-1 5.2.5.2
24 h at 125 °C 20 20 20 20
Ageing, 7 days at 125 °C 5.2.6
ISO 188
IRHD
Hardness change, max.
ISO 48 +8/–5 +8/–5 +8/–5 +8/–5
Tensile strength change,
ISO 37 –20 –20 –20 –20
max.
ISO 37 +10/–30 +10/–30 +10/–30 +10/–40
Elongation change, max.
% ISO 3384-1 5.2.7
Stress relaxation, max
or 15 15 15 18
7 days at 23 °C
ISO 6914
No cracking when viewed without magni-
Ozone resistance — ISO 1431-1 5.2.9
fication
Compression set in water for
% Annex B 5.2.11 30 30 30 30
1 680 h at 110 °C, max.

Table 5 — Physical-property requirements for type A materials used in class T2 applications

Property Unit Test Sub- Requirements for hardness classes
method clause 60 70 80
Permissible tolerance on nominal
IRHD ISO 48 5.2.3 ±5 ±5 ±5
hardness
Tensile strength, min. MPa ISO 37 5.2.4 9 9 9
Elongation at break, min. % ISO 37 5.2.4 200 150 100
Compression set, max.
% ISO 815-1 5.2.5.2
72 h at 23 °C 15 15 15
% ISO 815-1 5.2.5.2
24 h at 125 °C 20 20 20
Ageing, 7 days at 125 °C ISO 188 5.2.6
IRHD
Hardness change ISO 48 +8/–5 +8/–5 +8/–5
Tensile strength change, max. ISO 37 –20 –20 –20
Elongation change ISO 37 +10/–30 +10/–30 +10/–40
Stress relaxation, max % ISO 3384-1 5.2.7
7 days at 23 °C or 15 15 18
7 days at 125 °C ISO 6914 30 30 30
Stress relaxation, max. % ISO 6914 5.2.7
55 55 55
21 days at 140 °C
Volume change in water % ISO 1817 5.2.8
+8/–1 +8/–1 +8/–1
7 days at 95 °C
4 © ISO 2018 – All rights reserved
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ISO 9631:2018(E)
Table 5 (continued)
Property Unit Test Sub- Requirements for hardness cla
...

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