ISO 10156:2017/Amd 1:2026

• Status: Published
• Publication Date: 04-Oct-2026
• ICS: 23.020.35 - Gas cylinders
• ICS: 71.100.20 - Gases for industrial application
• Technical Committee: ISO/TC 58/SC 2 - Cylinder fittings
• Drafting Committee: ISO/TC 58/SC 2/WG 7 - Determination of properties of gases and gas mixtures
• Current Stage: 6060 - International Standard published
• Start Date: 05-Oct-2026
• Due Date: 16-Oct-2027
• Completion Date: 05-Oct-2026

• Consolidates: EN ISO 10156:2017/prA1 - Gas cylinders - Gases and gas mixtures - Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets - Amendment 1 (ISO 10156:2017/DAM 1:2026)
• Effective Date: 12-Feb-2026
• Consolidates: ISO/PAS 5112:2022 - Road vehicles — Guidelines for auditing cybersecurity engineering
• Effective Date: 07-Jan-2025
• Amends: ISO 10156:2017 - Gas cylinders — Gases and gas mixtures — Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets
• Effective Date: 19-Oct-2024

ISO 10156:2017/Amd.1:2026 is an ISO amendment to ISO 10156:2017 on gas cylinders, gases and gas mixtures, and the determination of fire potential and oxidizing ability for selecting cylinder valve outlets. It updates one calculation value for fluorine in the method and adds a bibliography reference. Users should read it together with the base 2017 standard.

What does ISO 10156:2017/Amd.1:2026 specify?

ISO 10156:2017/Amd.1:2026 is a targeted amendment to the ISO standard used to judge fire potential and oxidizing ability when selecting cylinder valve outlets. It matters where gases or gas mixtures must be matched to the right outlet arrangement for safe use and handling.

The amendment is organized around two changes only:

• 5.3.2, Table 4 - a changed coefficient for fluorine
• Bibliography - one added reference

What are the key requirements of ISO 10156:2017/Amd.1:2026?

ISO 10156:2017/Amd.1:2026 changes the calculation basis in 5.3.2, Table 4. The C coefficient for fluorine is replaced by 7,56. In practice, anyone using the ISO 10156 method for oxidizing-ability assessment must use the updated coefficient, because the result feeds the selection of cylinder valve outlets.

The amendment is specific to fluorine in Table 4. That means worksheets, software, product specifications, and internal procedures that still carry the earlier value need to be updated to avoid using an out-of-date calculation input.

The amendment also adds bibliography item [12], a BAM report on determining the oxidizing ability of gases and gas mixtures to ISO/TC 58/SC 2/WG 7. For users, this gives technical background for the method and a traceable reference for method maintenance or review.

Because this is Amendment 1 to ISO 10156:2017, it is not a standalone method. In practice, the amended text is applied together with the base standard when classifying gases and gas mixtures for cylinder valve outlet selection.

What terms does ISO 10156:2017/Amd.1:2026 define?

In ISO 10156:2017/Amd.1:2026, the main terms and expressions are used in the context of gas hazard assessment and valve-outlet selection:

• Fire potential - the part of the assessment that relates to whether a gas or gas mixture can contribute to fire risk.
• Oxidizing ability - the property assessed to judge whether a gas supports combustion and how it should be treated in outlet selection.
• Cylinder valve outlets - the outlet connections on cylinder valves that must be selected to suit the gas hazard classification.
• C coefficient - the factor used in Table 4 calculations; the amendment changes the value for fluorine.
• Fluorine - the gas named in the amended Table 4 entry.

Who uses ISO 10156:2017/Amd.1:2026?

ISO 10156:2017/Amd.1:2026 is used by people who classify gases and gas mixtures and choose matching cylinder valve outlets. Typical users include gas suppliers, cylinder and valve manufacturers, filling and inspection organizations, test laboratories, and safety or quality teams responsible for gas-cylinder specifications.

It is also relevant to engineers and buyers working with transportable gas cylinders when they need the outlet selection process to reflect the updated fluorine coefficient.

What changed in ISO 10156:2017/Amd.1:2026 from the previous edition?

ISO 10156:2017/Amd.1:2026 amends the fourth edition of ISO 10156:2017.

The stated changes are:

• In 5.3.2, Table 4, the C coefficient for fluorine is changed from 40 to 7,56.
• The bibliography gains reference [12] to a BAM report on determining oxidizing ability of gases and gas mixtures.

What does the ISO 10156:2017/Amd.1:2026 document contain?

ISO 10156:2017/Amd.1:2026 contains the formal amendment instruction for one table entry and one added bibliography item. It does not reproduce the full ISO 10156 method, but it tells the reader exactly where the method is updated.

For implementation work, the important content is the revised Table 4 coefficient and the added background reference. For design or conformity tasks, the amendment is used to keep calculations, records, and outlet-selection decisions aligned with the current ISO text.

International
Standard
ISO 10156
Fourth edition
Gas cylinders — Gases and gas
2017-07
mixtures — Determination of fire
potential and oxidizing ability
AMENDMENT 1
for the selection of cylinder valve
2026-10
outlets
AMENDMENT 1
Bouteilles à gaz — Gaz et mélanges de gaz — Détermination
du potentiel d'inflammabilité et d'oxydation pour le choix des
raccords de sortie de robinets
AMENDEMENT 1
Reference number
ISO 10156:2017/Amd.1:2026(en) © ISO 2026

ISO 10156:2017/Amd.1:2026(en)
© ISO 2026
All rights reserved.
This ISO publication is protected by copyright and is owned by ISO and/or its licensors.
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Any use beyond the scope of the granted rights is prohibited and may result in legal action.
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Published in Switzerland
ii
ISO 10156:2017/Amd.1:2026(en)
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,
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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 dr
...

Norme
internationale
ISO 10156
Quatrième édition
Bouteilles à gaz — Gaz et mélanges
2017-07
de gaz — Détermination du
potentiel d'inflammabilité et
AMENDEMENT 1
d'oxydation pour le choix des
2026-10
raccords de sortie de robinets
AMENDEMENT 1
Gas cylinders — Gases and gas mixtures — Determination of fire
potential and oxidizing ability for the selection of cylinder valve
outlets
AMENDMENT 1
Numéro de référence
ISO 10156:2017/Amd.1:2026(fr) © ISO 2026

ISO 10156:2017/Amd.1:2026(fr)
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Publié en Suisse
ii
ISO 10156:2017/Amd.1:2026(fr)
Avant-propos
L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes nationaux
de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est en général
confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude a le droit de faire
partie du comité technique créé à cet effet. Les organisations internationales, gouvernementales et non
gouvernementales, en liaison avec l'ISO participent également aux travaux. L'ISO collabore étroitement avec
la Commission électrotechnique internationale (IEC) en ce qui concerne la normalisation électrotechnique.
Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont
décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier, de prendre note des différents
critères d'approbation requis pour les différents types de documents ISO. Le présent document a
été rédigé conformément aux règles de rédaction données dans le
...