ISO/FDIS 25308

Rubber and plastics hose assemblies and tubing assemblies — Determination of gas-leakage by assembly fault

This document specifies the method for the determination of the volume of gas-leakage from the interface between hose and fitting or interface between tubing and fitting by assembly fault. Explanation of leakage determined by the test method in this document is provided in Annex A. Conception of leakage is shown in Figure A.1 and A.2.

Assemblages de tuyaux et de tubes en caoutchouc et en plastique — Détermination des fuites de gaz par défaut d'assemblage

General Information

• Status: Not Published
• ICS: 23.040.70 - Hoses and hose assemblies
• Technical Committee: ISO/TC 45/SC 1 - Rubber and plastics hoses and hose assemblies
• Drafting Committee: ISO/TC 45/SC 1/WG 4 - Hose test methods
• Current Stage: 5000 - FDIS registered for formal approval
• Start Date: 04-Nov-2025
• Completion Date: 02-Feb-2026

Standards Content (Sample)

FINAL DRAFT
International
Standard
ISO/TC 45/SC 1
Rubber and plastics hose
Secretariat: DIN
assemblies and tubing
Voting begins on:
assemblies — Determination of gas-
2025-12-15
leakage by assembly fault
Voting terminates on:
2026-02-09
Assemblages de tuyaux et de tubes en caoutchouc et en
plastique — Détermination des fuites de gaz par défaut
d'assemblage
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
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
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.
Reference number
FINAL DRAFT
International
Standard
ISO/TC 45/SC 1
Rubber and plastics hose
Secretariat: DIN
assemblies and tubing
Voting begins on:
assemblies — Determination of gas-
leakage by assembly fault
Voting terminates on:
Assemblages de tuyaux et de tubes en caoutchouc et en
plastique — Détermination des fuites de gaz par défaut
d'assemblage
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.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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 Reference number
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test pieces . 1
5 Apparatus . 2
6 Test conditions . 2
6.1 Conditioning of test pieces and apparatus .2
6.2 Test temperature .2
6.3 Test gas .2
6.4 Test pressure .2
7 Procedure . 3
8 Expression of results . 4
9 Test report . 5
Annex A (informative) Guidance on leakage . 6
Annex B (informative) Saturated vapour pressure . 8
Bibliography . 9

iii
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.
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
FINAL DRAFT International Standard ISO/FDIS 25308:2025(en)
Rubber and plastics hose assemblies and tubing
assemblies — Determination of gas-leakage by assembly fault
WARNING — Persons using this document should be familiar with normal laboratory practice. This
document 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.
1 Scope
This document specifies the method for the determination of the volume of gas-leakage from the interface
between hose and fitting or interface between tubing and fitting by assembly fault.
NOTE See Annex A for an explanation of leakage determined by the test method in this document. Conception of
leakage is shown in Figures A.1 and A.2.
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 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8330 and the following 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/ obpd
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
end fitting
device attached to the end of a hose or tubing to facilitate connection to equipment constituting hose
assembly
Note 1 to entry: "End fitting
...

ISO/TC 45/SC 1
Secretariat: DIN
Date: 2025-11-0412-01
Rubber and plastics hose assemblies and tubing assemblies —
Determination of gas-leakage by assembly fault
Assemblages de tuyaux et de tubes en caoutchouc et en plastique — Détermination des fuites de gaz par défaut
d'assemblage
FDIS stage
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: + 41 22 749 01 11
Fax: [phone]
EmailE-mail: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Test pieces . 2
5 Apparatus . 2
6 Test conditions . 2
6.1 Conditioning of test pieces and apparatus . 2
6.2 Test temperature . 2
6.3 Test gas . 2
6.4 Test pressure . 3
7 Procedure . 3
8 Expression of results . 5
9 Test report . 5
Annex A (informative) Guidance on leakage . 6
Annex B (informative) Saturated vapour pressure . 8
Bibliography . 9

© ISO 2025 – All rights reserved
iii
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.
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.
Field Code Changed
iv
DRAFT International Standard ISO/FDIS 25308:2025(en)

Rubber and plastics hose assemblies and tubing assemblies —
Determination of gas-leakage by assembly fault
WARNING — Persons using this document should be familiar with normal laboratory practice. This
document 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.
1 Scope
This document specifies the method for the determination of the volume of gas-leakage from the interface
between hose and fitting or interface between tubing and fitting by assembly fault.
NOTE See Annex AAnnex A for an explanation of leakage determined by the test method in this document.
Conception of leakage is shown in Figures A.1Figures A.1 and A.2A.2.
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 8330, Rubber and plastics hoses and hose assemblies — Vocabulary
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 8330 and the following 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/obpd
— — IEC Electropedia: available at https://www.electropedia.org/
3.1 3.1
end fitting
device attached to the end of a hose or tubing to facilitate connection to equipment constituting hose assembly
Note 1 to entry: "End fitting" can include an attached mating part to facilitate the test, if necessary.
3.2 3.2
permeation
process of penetration and effusion or diffusion of a gas or liquid through the hose wall

4 Test pieces
The test piece shall be a length of hose or tubing with end fittings. It shall have a free length of 0,5 m ± 0,005 m
for type test and the production length for routine test and maintenance inspection.
NOTE The type of fitting used and the method by which the fittings are fixed to the test piece can affect the results
of leakage obtained using this method.
5 Apparatus
5.1 5.1 General. Schematic layout of the test arrangements for the test method is shown in
Figure 1Figure 1.
5.2 5.2 Gas supply, provided with a suitable pressure regulator, pressure gauge or pressure
transducer and emergency excess flow shutoff valves in case of test piece failure.
5.3 5.3 Calibrated pressure gauge or pressure transducer with digital readout, capable of
reading to within 1 % or better, chosen for each test so that the test pressure is between 15 % and 85 % of the
full-scale reading.
5.4 5.4 Water bath, capable of being maintained at a specified temperature with an accuracy of ±2 °C
and of sufficient length to accommodate the test p
...