ISO 23711:2003
(Main)Elastomeric seals — Requirements for materials for pipe joint seals used in water and drainage applications — Thermoplastic elastomers
Elastomeric seals — Requirements for materials for pipe joint seals used in water and drainage applications — Thermoplastic elastomers
ISO 23711:2003 specifies requirements for materials used for moulded seals made of thermoplastic elastomers (TPEs) for joints in: thermoplastic piping systems for non-pressure waste water discharge (intermittent flow at up to 95 °C) inside buildings; 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); thermoplastic rainwater piping systems. 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.
Garnitures d'étanchéité en caoutchouc — Spécification des matériaux pour garnitures d'étanchéité utilisées dans le domaine de l'eau et du drainage — Élastomères thermoplastiques
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 23711
First edition
2003-12-01
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 23711:2003(E)
©
ISO 2003
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ISO 23711:2003(E)
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ii © ISO 2003 — All rights reserved
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ISO 23711:2003(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
6 Test pieces and temperature . 5
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
© ISO 2003 — All rights reserved iii
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ISO 23711:2003(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 23711 was prepared by Technical Committee ISO/TC 45, Rubber and rubber products, Subcommittee
SC 4, Products (other than hoses).
iv © ISO 2003 — All rights reserved
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INTERNATIONAL STANDARD ISO 23711:2003(E)
Elastomeric seals — Requirements for materials for pipe joint
seals used in water and drainage applications — Thermoplastic
elastomers
1 Scope
This International Standard specifies requirements for materials used for moulded seals made of
thermoplastic elastomers (TPEs) for joints in:
a) thermoplastic piping systems for non-pressure waste water 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 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.
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 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 471, Rubber — Temperatures, humidities and times for conditioning and testing
ISO 815, Rubber, vulcanized or thermoplastic — Determination of compression set at ambient, elevated or
low temperatures
ISO 1431-1, Rubber, vulcanized or thermoplastic — Resistance to ozone cracking — Part 1: Static strain test
ISO 1817, Rubber, vulcanized — Determination of the effect of liquids
ISO 3302-1, 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
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ISO 23711:2003(E)
ISO 4661-1, Rubber, vulcanized or thermoplastic — Preparation of samples and test pieces — Part 1:
Physical tests
ISO 9691:1992, Rubber — Recommendations for the workmanship of pipe joint rings — Description and
classification of imperfections
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
thermoplastic elastomer
a polymer or blend of polymers that does not require vulcanization or cross-linking during processing, yet has
elastic properties at its service temperature
NOTE 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
The three classes of hardness for materials for pipe joint seals are specified in Table 2.
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 4.1.1 of ISO 9691:1992
shall be considered as defects.
surface imperfections in zones not involved in the sealing function as described in 4.1.2.1 b) of
ISO 9691:1992 shall not be considered as defects.
NOTE 1 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 should be agreed between the interested parties; the acceptance
criteria depend upon the seal type or design.
NOTE 2 Internal imperfections as described in 4.2 of ISO 9691:1992 could 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.
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ISO 23711:2003(E)
5.3 Hardness
When determined by the microtest method specified in ISO 48, on samples prepared in accordance with 6.1.2,
the hardness shall comply with the requirements given in Table 2.
NOTE If the dimensions of a seal are appropriate, the normal test method specified in ISO 48 can be used, provided
that the microtest method is used for reference purposes.
For the same seal, the difference between the minimum and maximum hardness values shall not be more
than 5 IRHD. Each value shall be within the specified tolerances.
5.4 Tensile strength and elongation at break
The tensile strength and elongation at break shall be determined by the method specified in ISO 37 in the
direction perpendicular to the mould flow on dumb-bell test pieces, preferably cut out of a seal or out of a
sample plate. The results obtained on sample plate test pieces shall be accepted.
Sample plates shall be prepared as specified in 6.1.1 and 6.1.3. The tensile strength and elongation at break
shall comply with the requirements given in Table 2.
5.5 Compressive set in air
5.5.1 General
If the test piece is taken from a seal, then the measurement shall be carried out as far as possible in the
direction of compression of the seal in service at 25 % compression.
5.5.2 Compression set at 23 °C and 70 °C
When determined by the method specified in ISO 815, at 23 °C and 70 °C, using the small type B test piece,
the compression set shall comply with the requirements given in Table 2.
5.5.3 Low temperature compression set at −−−−10 °C
When determined by the method specified in ISO 815 at −10 °C, using the small type B test piece, and the
(30 ± 3) min recovery measurement, the compression set of seals used in drainage and sewerage
applications shall comply with the requirements given in Table 2.
5.6 Accelerated ageing in air
Test pieces prepared for the determination of hardness according to 5.3 and for the determination of tensile
strength and elongation at break (see 5.4) shall be aged in air by the normal oven method specified in
ISO 188, for 7 days at 70 °C.
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