ISO 9631:2003

Rubber seals — Joint rings for pipelines for hot-water supply up to 110 degrees C — Specification for the material

ISO 9631:2003 specifies requirements for materials used in vulcanized-rubber seals for hot potable and non-potable 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. 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 International Standard is intended to be used where appropriate with product standards which specify performance requirements for joints. This International Standard is applicable to joint seals for use with all pipeline materials, including iron, steel, 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 hardnesses 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. Joint rings made from cellular rubber materials or with enclosed voids as part of their design are not covered by this International Standard.

Joints étanches en caoutchouc — Garnitures d'étanchéité destinées aux joints de canalisations pour la fourniture d'eau chaude jusqu'à 110 degrés C — Spécifications pour les matériaux

General Information

• Status: Withdrawn
• Publication Date: 10-Dec-2003
• Withdrawal Date: 10-Dec-2003
• ICS: 83.140.50 - Seals
• Technical Committee: ISO/TC 45/SC 4 - Products (other than hoses)
• Drafting Committee: ISO/TC 45/SC 4/WG 2 - Rubber seals
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 06-Mar-2018

Relations

• Revised: ISO 9631:2018 - Rubber seals — Joint rings for pipelines for hot-water supply up to 110 °C — Specification for the material
• Effective Date: 21-Dec-2013
• Revises: ISO 9631:1991 - Rubber seals — Joint rings for hot water supply pipelines up to 110 degrees C — Specification for the material
• Effective Date: 15-Apr-2008

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 9631
Second edition
2003-12-15


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 9631:2003(E)
©
ISO 2003

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ISO 9631:2003(E)
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ii © ISO 2003 – All rights reserved

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ISO 9631:2003(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references. 1
3 Classification. 2
4 Requirements. 4
5 Testing. 6
6 Quality assurance. 7
7 Storage. 7
8 Designation. 7
9 Marking and labelling . 7
Annex A (normative) Determination of splice strength. 8
Annex B (normative) Determination of compression set in hot water at 110 °C for seals
manufactured from isobutylene-isoprene copolymers. 9
Annex C (informative) Quality assurance . 10
Annex D (informative) Guidance on storage of seals . 11
Bibliography . 12


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ISO 9631:2003(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 9631 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 9631:1991), which has been technically revised.
iv © ISO 2003 – All rights reserved

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INTERNATIONAL STANDARD ISO 9631:2003(E)

Rubber seals — Joint rings for pipelines for hot-water supply
up to 110 °C — Specification for the material
WARNING — Persons using this International Standard 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 and to
ensure compliance with any national regulatory conditions.
1 Scope
This International Standard specifies requirements for materials used in vulcanized-rubber seals for hot
potable and non-potable 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 3).
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
International Standard is intended to be used where appropriate with product standards which specify
performance requirements for joints.
This International Standard is applicable to joint seals for use with all pipeline materials, including iron, steel,
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 hardnesses 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.
Joint rings made from cellular rubber materials or with enclosed voids as part of their design are not covered
by this International Standard.
2 Normative references
The following referenced documents are indispensable for the application 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 34-2:1996, Rubber, vulcanized or thermoplastic — Determination of tear strength — Part 2: Small (Delft)
test pieces
ISO 37:1994, Rubber, vulcanized or themoplastic — Determination of tensile stress-strain properties
ISO 48:1994, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD
and 100 IRHD)
ISO 188:1998, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 471:1995, Rubber — Temperatures, humidities and times for conditioning and testing
ISO 815:1991, Rubber, vulcanized or thermoplastic — Determination of compression set at ambient, elevated
or low temperatures
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ISO 9631:2003(E)
ISO 1431-1:1989, Rubber, vulcanized or thermoplastic — Resistance to ozone cracking — Part 1: Static strain
test
ISO 1629:1995, Rubber and latices — Nomenclature
ISO 1817:1999, Rubber, vulcanized — Determination of the effect of liquids
ISO 2285:2001, Rubber, vulcanized or thermoplastic — Determination of tension set under constant
elongation, and of tension set, elongation and creep under constant tensile load
ISO 3302-1:1996, Rubber — Tolerances for products — Part 1: Dimensional tolerances
ISO 3384:1999, Rubber, vulcanized or thermoplastic — Determination of stress relaxation in compression at
ambient and at elevated temperatures
ISO 3387:1994, Rubber — Determination of crystallization effects by hardness measurements
ISO 4661-1:1993, Rubber, vulcanized or thermoplastic — Preparation of samples and test pieces — Part 1:
Physical tests
1)
ISO 6914:— , Rubber, vulcanized or thermoplastic — Determination of ageing characteristics by measurement
of stress relaxation
ISO 9691:1992, Rubber — Recommendations for the workmanship of pipe joint rings — Description and
classification of imperfections
3 Classification
Five classes of materials for pipe joint seals are specified in Table 2. 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


1) To be published. (Revision of ISO 6914:1985)
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ISO 9631:2003(E)
Table 2 — Physical-property requirements for materials used in continuous hot water up to 110 °C
Requirements for hardness classes
Sub-
Property Unit Test method
clause
50 60 70 80 90
Permissible tolerance on nominal
IRHD ISO 48 4.2.3 ±5 ±5 ±5 ±5 ±5
hardness
Tensile strength, min. MPa ISO 37 4.2.4 9 9 9 9 9
Elongation at break, min. % ISO 37 4.2.4 250 200 200 100 100
Compression set, max.
72 h at 23 °C % ISO 815 4.2.5.2 15 15 15 15 15
24 h at 125 °C % ISO 815 4.2.5.2 20 20 20 20 20
Ageing, 7 days at 125 °C ISO 188 4.2.6
Hardness change, max. IRHD 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
a
Stress relaxation, max. % ISO 3384 4.2.7
7 days at 23 °C 15 15 15 18 18
7 days at 125 °C 30 30 30 30 30
a
Volume change in water, max. % ISO 1817 4.2.8
7 days at 95 °C +8/–1 +8/–1 +8/–1 +8/–1 +8/–1
Ozone resistance — ISO 1431-1 4.2.9 No cracking when viewed without magnification
a
Tear strength, min. N ISO 34-2 4.2.10 20 20 20 20 20
b
Compression set in water, max. % Annex B 4.2.11 30 30 30 30 30
a
See 4.2.11 for seals manufactured from isobutylene-isoprene copolymers.
b
This requirement only applies to isobutylene-isoprene copolymers.

Table 3 — Designation of elastomeric joint seals by type, application and requirements
Type Application Requirements Subclause
Table 2
WB Hot potable water (continuous supply up to 110 °C)
Effect on water quality 4.1.2
WD Hot non-potable water (continuous supply up to 110 °C) Table 2
Hot potable water (continuous supply up to 110 °C) Table 2

WE (seals manufactured from isobutylene-isoprene Effect on water quality
4.1.2
copolymer) Compression set in hot water
Hot potable water (continuous supply up to 110 °C)
Table 2
WF (seals manufactured from isobutylene-isoprene
Compression set in hot water
copolymer)

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ISO 9631:2003(E)
4 Requirements
4.1 Requirements for material
4.1.1 General
The material shall be free of any substances which may have a deleterious effect on the fluid being conveyed,
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 Subclause 4.1.2.
4.1.2 Effect on water quality
For hot potable-water applications, the material shall not impair the quality of the water under the conditions of
use. The material shall comply with the national requirements in the country of use.
4.2 Requirements for finished seals
4.2.1 Dimensional tolerances
Tolerances shall be specified from the appropriate classes in ISO 3302-1.
4.2.2 Imperfections and defects
The seals shall be free of defects or irregularities which could affect their ability to function correctly.
Classification of imperfections shall be in accordance with ISO 9691, as follows:
 surface imperfections in zones involved in the sealing function, as described in 4.1.1 of ISO 9691:1992,
shall be considered as defects;
 minor surface imperfections in zones not involved in the sealing function, as described in clause
4.1.2.1 b) of ISO 9691:1992, shall not be considered as defects.
Major surface imperfections in zones not involved in the sealing function, as described in 4.1.2.1 a) of
ISO 9691:1992, could be considered as defects. This shall, however, be agreed between the intereste
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