ISO 4633:2015
(Main)Rubber seals — Joint rings for water supply, drainage and sewerage pipelines — Specification for materials
Rubber seals — Joint rings for water supply, drainage and sewerage pipelines — Specification for materials
ISO 4633:2015 specifies requirements for materials used in vulcanized rubber seals for the following: a) cold drinking-water supplies (up to 50 °C); b) drainage, sewerage, and rainwater systems (continuous flow up to 45 °C and intermittent flow up to 95 °C).
Joints étanches en caoutchouc — Garnitures de joints de canalisations d'adduction et d'évacuation d'eau (égouts inclus) — Spécification des matériaux
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 4633
Fourth edition
2015-06-01
Rubber seals — Joint rings for water
supply, drainage and sewerage
pipelines — Specification for materials
Joints étanches en caoutchouc — Garnitures de joints de
canalisations d’adduction et d’évacuation d’eau (égouts inclus) —
Spécification des matériaux
Reference number
ISO 4633:2015(E)
©
ISO 2015
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ISO 4633:2015(E)
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ii © ISO 2015 – All rights reserved
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ISO 4633:2015(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Classification . 2
4 Requirements . 2
4.1 Requirements for materials . 2
4.1.1 General. 2
4.1.2 Effect on water quality . 2
4.1.3 Microbiological deterioration . 2
4.2 Requirements for finished seals . 3
4.2.1 Dimensional tolerances. 3
4.2.2 Imperfections and defects . 3
4.2.3 Hardness . 3
4.2.4 Tensile strength and elongation at break . 3
4.2.5 Compression set in air . 3
4.2.6 Accelerated ageing in air . 4
4.2.7 Stress relaxation in compression . 4
4.2.8 Volume change in water . 4
4.2.9 Ozone resistance . 5
4.2.10 Splices of prevulcanized profile ends . 5
4.3 Optional requirements . 5
5 Test pieces and test temperature . 6
5.1 Preparation of test pieces . 6
5.2 Test temperature . 7
6 Quality assurance . 7
7 Storage . 7
8 Designation . 7
9 Marking and labelling . 8
Annex A (normative) Determination of splice strength . 9
Annex B (informative) Quality assurance.10
Annex C (informative) Guidance on storage of seals .11
Bibliography .12
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ISO 4633:2015(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 meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers
to Trade (TBT) see the following URL: Foreword - Supplementary information.
The committee responsible for this document is ISO/TC 45, Rubber and rubber products, Subcommittee
SC 4, Products (other than hoses).
This fourth edition cancels and replaces the third edition (ISO 4633:2002), which has been
technically revised.
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INTERNATIONAL STANDARD ISO 4633:2015(E)
Rubber seals — Joint rings for water supply, drainage and
sewerage pipelines — Specification for materials
WARNING — Persons using this International Standard should be familiar with normal laboratory
practice. This International 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
the following:
a) cold drinking-water supplies (up to 50 °C);
b) drainage, sewerage, and rainwater systems (continuous flow up to 45 °C and intermittent flow
up to 95 °C).
The different designations of seals specified are defined according to their type, application, and
requirements (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 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 or non-composite seals. In the case of composite
seals for materials of hardness ranges from 76 IRHD to 95 IRHD, the requirements for elongation at
break, compression set, and stress relaxation apply only when the material is participating in the sealing
function or in the long term stability of the seal.
Joint seals made with an enclosed void as part of their design are included in the scope of this
International Standard.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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, Rubber, vulcanized or thermoplastic — Determination of hardness (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
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ISO 4633:2015(E)
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 2285, 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, 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 3387, Rubber — Determination of crystallization effects by hardness measurements
ISO 6914, 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 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Classification
Six classes of material for pipe joint seals are specified in Table 2 and three classes of material in Table 3.
A nominal hardness shall be specified within the ranges in Table 1.
Table 1 — Hardness classification
Hardness range 40 50 60 70 80 90
Range of hardness, IRHD 36 to 45 46 to 55 56 to 65 66 to 75 76 to 85 86 to 95
4 Requirements
4.1 Requirements for materials
4.1.1 General
The materials shall be free of any substances which can have a deleterious effect on the fluid being
conveyed, the life of the sealing ring, the pipe, or the fitting. Elastomeric components of composite seals
not exposed to the contents of the pipeline are not required to meet the requirements of 4.1.2.
4.1.2 Effect on water quality
For cold-water applications, the materials shall not impair the quality of the water under the conditions
of use. The materials shall comply with the national requirements in the country of use.
4.1.3 Microbiological deterioration
The materials shall be resistant to microbiological deterioration if the application so requires. The test
methods and the requirements shall be as specified in national standards.
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ISO 4633:2015(E)
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 function. Classification of
imperfections shall be in accordance with 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), could be considered as defects. This shall be agreed upon between the interested parties,
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