ISO 11424:2017

INTERNATIONAL ISO
STANDARD 11424
Second edition
2017-02
Rubber hoses and tubing for air
and vacuum systems for internal-
combustion engines — Specification
Tuyaux et tubes en caoutchouc pour systèmes d’aération et à vide des
moteurs à combustion interne — Spécifications
Reference number
ISO 11424:2017(E)
©
ISO 2017

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ISO 11424:2017(E)

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ISO 11424:2017(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 2
4 Classification . 2
4.1 Types. 2
4.2 Classes . 2
5 Hose and tubing bores . 3
6 Dimensions and tolerances . 3
6.1 Hoses . 3
6.2 Tubing . 3
7 Requirements for physical properties . 4
7.1 Rubber compounds . 4
7.1.1 Selection of test pieces . 4
7.1.2 Hardness . 4
7.1.3 Tensile strength and elongation at break . 4
7.1.4 Change in properties after heat-ageing . 4
7.1.5 Compression set . 5
7.1.6 Resistance to oxygenated fuels . 5
7.1.7 Resistance to oil No.3 . 5
7.2 Hose and tubing . 5
7.2.1 Proof pressure . 5
7.2.2 Minimum burst pressure . 6
7.2.3 Adhesion . 6
7.2.4 Ozone resistance . 6
7.2.5 Low-temperature flexibility after heat-ageing . 6
7.2.6 Amount of extractable products . 6
7.2.7 Tear resistance . 6
7.2.8 Suction resistance (only for Type A). 6
7.2.9 Resistance to kinking . 7
8 Frequency of testing . 7
9 Marking . 7
10 Recommendations for packaging and storage . 7
Annex A (normative) Type and routine tests .10
Annex B (informative) Recommended production tests .11
Bibliography .12
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ISO 11424:2017(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 World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www . i so .org/ iso/ foreword .html
This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 1, Hoses (rubber and plastics).
This second edition cancels and replaces the first edition (ISO 11424:1996), which has been technically
revised.
The main changes are the following:
— in 6.2, inside diameter (ID) for each nominal bore has been included;
— requirement on frequency of testing has been added in Clause 8;
— requirement to mark nominal bore of the hose or tubing has been added in Clause 9;
— recommendations for packaging and storage have been added in Clause 10;
— Annex A and Annex B have been added.
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INTERNATIONAL STANDARD ISO 11424:2017(E)
Rubber hoses and tubing for air and vacuum systems for
internal-combustion engines — Specification
1 Scope
This document specifies requirements for rubber hoses and tubing for use in the various air and vacuum
systems found on internal combustion engines. This document does not cover hoses used for direct
power-brake actuation in trucks and trailers, nor for air intakes and ducting within the passenger
compartment. The highest-temperature hoses are generally used for turbocharger applications. All
hoses and tubing remain serviceable down to −40°C.
NOTE Although the term vacuum is generally used, in reality the application is one of reduced air pressure
used for the purposes of actuation or monitoring of the various engine-system components. The air carried by
the tubing or hoses may be clean and free of contaminants but may also contain oil, fuel and their vapours as
contamination, due to the particular installation and application.
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 37:2011, 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 815-1:2014, Rubber, vulcanized or thermoplastic — Determination of compression set — Part 1: At
ambient or elevated temperatures
ISO 1402, Rubber and plastics hoses and hose assemblies — Hydrostatic testing
ISO 1629, Rubber and latices — Nomenclature
ISO 1817:2015, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 3302-1, Rubber — Tolerances for products — Part 1: Dimensional tolerances
ISO 4671, Rubber and plastics hoses and hose assemblies — Methods of measurement of the dimensions of
hoses and the lengths of hose assemblies
ISO 7233:2016, Rubber and plastics hoses and hose assemblies — Determination of resistance to vacuum
ISO 7326, Rubber and plastics hoses — Assessment of ozone resistance under static conditions
ISO 8033, Rubber and plastics hoses — Determination of adhesion between components
ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
ISO 10619-1:2011, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness —
Part 1: Bending tests at ambient temperature
ISO 10619-2:2011, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness —
Part 2: Bending tests at sub-ambient temperatures
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ISO 11424:2017(E)

ISO 19013-1:2005, Rubber hoses and tubing for fuel circuits for internal combustion engines —
Specification — Part 1: Diesel fuels
3 Terms, definitions and abbreviated terms
For the purposes of this document, the terms and definitions given in ISO 8330 and the abbreviated
terms given in ISO 1629 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
4 Classification
4.1 Types
Type A — internally reinforced hose with a working pressure up to 0,3 MPa (3 bar).
Type B — homogeneous tube with a working pressure up to 0,12 MPa (1,2 bar).
4.2 Classes
Class 1 — Long-term working temperature up to 70 °C; maximum working temperature up to 100 °C.
Not recommended for applications where resistance to oils, fuel and their vapours is required.
NOTE 1 Typically, styrene-butadiene rubber (SBR) can be used.
Class 2 — Long-term working temperature up to 100 °C; maximum working temperature up to 125 °C.
Resistant to oils and their vapours.
NOTE 2 Typically, chloroprene rubber (CR) can be used.
Class 3 — Long-term working temperature up to 100 °C, maximum working temperature up to 125 °C.
Resistant to oils, fuels and their vapours.
NOTE 3 Typically, acrylonitrile-butadiene rubber (NBR) can be used.
Class 4 — Long-term working temperature up to 125 °C, maximum working temperature u
...