ISO 11424:2023

Rubber hoses and tubing for air and vacuum systems for internal-combustion engines — Specification

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 can be clean and free of contaminants but can also contain oil, fuel and their vapours as contamination, due to the particular installation and application.

Tuyaux et tubes en caoutchouc pour systèmes d'aération et à vide des moteurs à combustion interne — Spécifications

General Information

• Status: Published
• Publication Date: 19-Jul-2023
• ICS: 27.020 - Internal combustion engines
• ICS: 83.140.30 - Plastics pipes and fittings for non fluid use
• ICS: 83.140.40 - Hoses
• Technical Committee: ISO/TC 45/SC 1 - Rubber and plastics hoses and hose assemblies
• Drafting Committee: ISO/TC 45/SC 1 - Rubber and plastics hoses and hose assemblies
• Current Stage: 6060 - International Standard published
• Start Date: 20-Jul-2023
• Due Date: 17-Jul-2024
• Completion Date: 20-Jul-2023

Relations

• Revises: ISO 11424:2017 - Rubber hoses and tubing for air and vacuum systems for internal-combustion engines — Specification
• Effective Date: 28-Jan-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 11424
Third edition
2023-07
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 11424:2023(E)
© ISO 2023

---------------------- Page: 1 ----------------------
ISO 11424:2023(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
  © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 11424:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 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 Vacuum resistance (only for Type A) . 6
7.2.9 Resistance to kinking . 7
7.3 Requirement for all classes . 7
8 Frequency of testing . .8
9 Marking . . 9
10 Recommendations for packaging and storage . 9
Annex A (normative) Type and routine tests .10
Annex B (informative) Recommended production tests .11
Bibliography .12
iii
© ISO 2023 – All rights reserved

---------------------- Page: 3 ----------------------
ISO 11424:2023(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at  www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of 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
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 1, Rubber and plastics hoses and hose assemblies.
This third edition cancels and replaces the second edition (ISO 11424:2017), of which it constitutes a
minor revision. The change is that the normative references have been updated.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
  © ISO 2023 – All rights reserved

---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 11424:2023(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 can be clean and free of contaminants but can 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 37:2017, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between
10 IRHD and 100 IRHD
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 815-1:2019, 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 1817:2022, 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 7233:2021, 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 10619-1:2017, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part
1: Bending tests at ambient temperature
ISO 10619-2:2021, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part
2: Bending tests at sub-ambient temperatures
1
© ISO 2023 – All rights reserved

---------------------- Page: 5 ----------------------
ISO 11424:2023(E)
ISO 19013-1:2019, Rubber hoses and tubing for fuel circuits for internal combustion engines — Specification
— Part 1: Diesel fuels
3 Terms and definitions
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 terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Classification
4.1 Types
Type A refers to a internally reinforced hose with a working pressure up to 0,3 MPa (3 bar).
Type B refers to a homogeneous tube with a working pressure up to 0,12 MPa (1,2 bar).
4.2 Classes
Class 1 refers to long-term working temperature up to 70 °C; maximum working temperature up
to 100 °C. It is 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 refers to long-term working temperature up to 100 °C; maximum working temperature up to
125 °C. It is resistant to oils and their vapours.
NOTE 2 Typically, chloroprene rubber (CR) can be used.
Class 3 refers to long-term working temperature up to 100 °C, maximum working temperature up to
125 °C. It is resistant to oils, fuels and their vapours.
NOTE 3 Typically, acrylonitrile-butadiene rubber
...

ISO/FDIS 11424:2023(E)
ISO TC 45/SC 1/WG 2
Secretariat: DIN
Rubber hoses and tubing for air and vacuum systems for internal-combustion engines —
Specification

FDIS stage

---------------------- Page: 1 ----------------------
Tuyaux et tubes en caoutchouc pour systèmes d'aération et à vide des moteurs à combustion
interne — Spécifications
Third edition
Date: 2023-03-30

---------------------- Page: 2 ----------------------
ISO/FDIS 11424:2023(E)
© ISO 20182023
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’sISO's member body in
the country of the requester.
ISO Copyright Office
CP 401 • CH. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: + 41 22 749 01 11
Fax: [phone]
Email: [e-mail] [e-mail]
Website: www.iso.orgwww.iso.org
Published in Switzerland.
iv © ISO 2023 – All rights reserved

---------------------- Page: 3 ----------------------
ISO/FDIS 11424:2023(E)
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Classification . 2
5 Hose and tubing bores . 3
6 Dimensions and tolerances . 3
Table 1 — Hose dimensions and tolerances . 3
Table 2 — Nominal bore diameters and wall thickness of tubing . 4
7 Requirements for physical properties . 4
8 Frequency of testing . 7
9 Marking . 7
10 Recommendations for packaging and storage . 8
Table 3 — Requirements for all classes . 8
Annex A (normative) Type and routine tests . 10
Table A.1 — Frequency of type tests and routine tests . 10
Annex B (informative) Recommended production tests. 11
Table B.1 — Recommended production tests . 11
Bibliography . 12

© ISO 2023 – All rights reserved v

---------------------- Page: 4 ----------------------
ISO/FDIS 11424:2023(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 documentsdocument 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 drawnISO draws attention to the possibility that some of the elementsimplementation of this
document may beinvolve the subjectuse of (a) patent(s). ISO takes no position concerning the evidence,
validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of
this document, ISO had not received notice of (a) patent(s) which may be required to implement this
document. However, implementers are cautioned that this may not represent the latest information,
which may be obtained from the patent database available at  www.iso.org/patents. 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 ).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of 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
www.iso.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). hoses and hose assemblies.
This third edition cancels and replaces the second edition (ISO 11424:2017), of which it constitutes a
minor revision. The main changes arechange is that the following:
— normative references have been updated.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
vi © ISO 2023 – All rights reserved

---------------------- Page: 5 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 11424:2023(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 maycan be clean and free of contaminants but maycan 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 37:2017, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48-2, Rubber, vulcanized or thermoplastic — Determination of hardness (— Part 2: Hardness between
10 IRHD and 100 IRHD)
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 815--1:2019, 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 1817:20152022, 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 7233:2021, 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 2023 – All rights reserved 1

---------------------- Page: 6 ----------------------
ISO/FDIS 11424:2023(E)
ISO 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
ISO 10619--1:2017, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part
1: Bending tests at ambient temperature
ISO 10619--2:2021, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part
2: Bending tests at sub-ambient temperatures
ISO 19013--1:2019, Rubber hoses and tubing for fuel circuits for internal combustion engines —
Specification — Part 1: Diesel fuels
3 Terms and definitions
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 terminologicalterminology databases for use in standardization at the following
addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Classification
4.1 Types
Type A —refers to internally reinforced hose with a working pressure up to 0,3 MPa (3 bar).
Type B —refers to homogeneous tube with a working pressure up to 0,12 MPa (1,2 bar).
4.2 Classes
Class 1 —refers to long-term working temperature up to 70 °C; maximum working temperature up to
100 °C. It is 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 —refers to long-term working temperature up to 100 °C; maximum working temperature up to
125 °C. It is resistant to oils and their vapours.
NOTE 2 Typically, chloroprene rubber (CR) can be used.
Class 3 —refers to long-term working temperature up to 100 °C, maximum working temperature up to
125 °C. It is resistant to oils, fuels and their vapours.
NOTE 3 Typically, acrylonitrile-butadiene rubber (NBR) can be used.
Class 4 —refers to long-term working temperature up to 125 °C, maximum working temperature up to
150 °C. It is not recommended for applications where resistance to oils, fuels and their vapours is
required.
NOTE 4 Typically, ethylene-propylene rubber (EPM or EPDM) can be used.
2 © ISO 2023 – All rights reserved

---------------------- Page: 7 ----------------------
ISO/FDIS 11424:2023(E)
Class 5 —refers to long-term working temperature up to 125 °C, maximum working temperature up to
150 °C. It is resistant to oils and their vapours.
NOTE 5 Typically, chlorinated or chlorosulfonated polyethylene (CM or CSM) can be used.
Class 6 —refers to long-term working temperature up to 125 °C, maximum working temperature up to
150 °C. It is resistant to oils, fuels and their vapours.
NOTE 6 Typically, epichlorohydrin or hydrogenated nitrile rubbers (CO, ECO or HNBR) can be used.
Class 7 —refers to long-term working temperature up to 150 °C, maximum working temperature up to
175 °C. It is not recommended for applications where resistance to oils, fuels and their vapours is
required.
NOTE 7 Typically, silicone rubber (VMQ) can be used.
Class 8 —refers to long-term working temperature up to 150 °C, maximum working temperature up to
175 °C. It is resistant to oils and their vapours.
NOTE 8 Typically, acrylic rubber (ACM or AEM) can be used.
Class 9 —refers to long-term working temperature up to 150 °C, maximum working temperature up to
175 °C. It is resistant to oils, fuels and their vapours.
NOTE 9 Typically, fluoroelastomer or fluorosilicone rubbers (FKM or FVMQ) can be used.
Class 10 —refers to long-term working temperature up to 175 °C, maximum working temperature up to
200 °C. It is resistant to oils and their vapours.
NOTE 10 Typically, fluoroelastomer or fluorosilicone rubbers (FKM or FVMQ) can be used.
Hoses are thus designated with a two-character descriptor such as type A4 or type B6, etc.
In cases where type A hose cover and lining are manufactured from materials of different classes, a three-
character descriptor shall be used thus: Type A9/5 where the second character describes the lining
material and the third character describes the cover material.
Similarly, where type B tubing is of a composite construction, a three-character descriptor is also used
thus: Type B3/2.
5 Hose and tubing bores
The bore of all hoses and tubing shall be clean and free from any contamination when examined visually.
6 Dimensions and tolerances
6.1 Hoses
When determined by the methods described in ISO 4671, the dimensions and tolerances shall comply
with the values given in Table 1.
6.2 Tubing
When determined by the methods described in ISO 4671, bore diameters and wall thicknesses shall be
as given in Table 2. Tolerances shall be selected from the appropriate categories given in ISO 3302--1.
Table 1 — Hose dimensions and tolerances
© ISO 2023 – All r
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 11424
ISO/TC 45/SC 1
Rubber hoses and tubing for air
Secretariat: DIN
and vacuum systems for internal-
Voting begins on:
2023-04-14 combustion engines — Specification
Voting terminates on:
Tuyaux et tubes en caoutchouc pour systèmes d'aération et à vide des
2023-06-09
moteurs à combustion interne — Spécifications
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 11424:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 1 ----------------------
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 11424
ISO/TC 45/SC 1
Rubber hoses and tubing for air
Secretariat: DIN
and vacuum systems for internal-
Voting begins on:
combustion engines — Specification
Voting terminates on:
Tuyaux et tubes en caoutchouc pour systèmes d'aération et à vide des
moteurs à combustion interne — Spécifications
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 11424:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 2 ----------------------
ISO/FDIS 11424:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 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 heat­ageing . 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 Vacuum resistance (only for Type A) . 6
7.2.9 Resistance to kinking . 7
7.3 Requirement for all classes . 7
8 Frequency of testing . .8
9 Marking . . 9
10 Recommendations for packaging and storage . 9
Annex A (normative) Type and routine tests .10
Annex B (informative) Recommended production tests .11
Bibliography .12
iii
© ISO 2023 – All rights reserved

---------------------- Page: 3 ----------------------
ISO/FDIS 11424:2023(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 non­governmental, 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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at  www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of 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
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 45, Rubber and rubber products,
Subcommittee SC 1, Rubber and plastics hoses and hose assemblies.
This third edition cancels and replaces the second edition (ISO 11424:2017), of which it constitutes a
minor revision. The change is that the normative references have been updated.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
  © ISO 2023 – All rights reserved

---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 11424:2023(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
power­brake 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 can be clean and free of contaminants but can 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 37:2017, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 48­2, Rubber, vulcanized or thermoplastic — Determination of hardness — Part 2: Hardness between
10 IRHD and 100 IRHD
ISO 188, Rubber, vulcanized or thermoplastic — Accelerated ageing and heat resistance tests
ISO 815­1:2019, 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 1817:2022, Rubber, vulcanized or thermoplastic — Determination of the effect of liquids
ISO 3302­1, 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 7233:2021, 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 10619­1:2017, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part
1: Bending tests at ambient temperature
ISO 10619­2:2021, Rubber and plastics hoses and tubing — Measurement of flexibility and stiffness — Part
2: Bending tests at sub-ambient temperatures
1
© ISO 2023 – All rights reserved

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ISO/FDIS 11424:2023(E)
ISO 19013­1:2019, Rubber hoses and tubing for fuel circuits for internal combustion engines — Specification
— Part 1: Diesel fuels
3 Terms and definitions
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 terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Classification
4.1 Types
Type A refers to internally reinforced hose with a working pressure up to 0,3 MPa (3 bar).
Type B refers to homogeneous tube with a working pressure up to 0
...