SIST EN ISO 10156:2018/A1:2026

• Status: Published
• Public Enquiry End Date: 01-May-2026
• Publication Date: 08-Nov-2026
• ICS: 23.020.35 - Gas cylinders
• ICS: 71.100.20 - Gases for industrial application
• Technical Committee: TLP - Pressure vessels
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 15-Oct-2026
• Due Date: 20-Dec-2026
• Completion Date: 09-Nov-2026
• Directive: 2008/68/EC - Directive 2008/68/EC of the European Parliament and of the council of 24 September 2008 on the inland transport of the dangerous goods
• Mandate: M/TDG - Standards for referencing in the RID-ADR
• Ref Project: EN ISO 10156:2017/A1:2026 - 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/Amd 1:2026)

• Amends: SIST EN ISO 10156:2018 - Gas cylinders - Gases and gas mixtures - Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets (ISO 10156:2017)
• Effective Date: 01-Dec-2026

SIST EN ISO 10156:2018/A1:2026 is Amendment 1 to ISO 10156:2017, published by SIST as the Slovenian adoption of the ISO amendment. It updates the method used to determine fire potential and oxidizing ability when selecting cylinder valve outlets for gases and gas mixtures. In practice, it is the document to use when a gas supplier, cylinder maker, or reviewer needs to apply the revised outlet-selection rule for the affected gas category.

What does SIST EN ISO 10156:2018/A1:2026 specify?

SIST EN ISO 10156:2018/A1:2026 specifies changes to the base standard ISO 10156:2017 for gas cylinders, gases and gas mixtures, and the selection of cylinder valve outlets based on fire potential and oxidizing ability. The amendment is focused and technical: it revises one entry in Clause 5.3.2, Table 4, and adds one bibliography reference.

Part of the document	What it covers
Clause 5.3.2, Table 4	Revision of the Ci coefficient entry for fluorine
Bibliography	Added reference on determining oxidizing ability of gases and gas mixtures

The document is organized as an amendment to the underlying standard, so users apply it together with ISO 10156:2017. That matters because the amendment changes a specific coefficient used in the selection method rather than replacing the whole standard.

What are the key requirements of SIST EN ISO 10156:2018/A1:2026?

SIST EN ISO 10156:2018/A1:2026 changes the technical basis for classifying at least one gas used in the outlet-selection method. The practical effect is that anyone applying ISO 10156:2017 must use the updated Table 4 entry when handling fluorine.

Revised coefficient in Table 4

Clause 5.3.2, Table 4 is amended by changing the Ci coefficient for fluorine. In practice, this affects the classification step that supports choosing a suitable cylinder valve outlet, so users must make calculations and product decisions from the amended table rather than the previous one.

Updated bibliographic support

The Bibliography gains a report on determining oxidizing ability of gases and gas mixtures. This matters for engineers and technical reviewers because it points to background material linked to the assessment method used in the standard.

Apply the amendment with the base standard

SIST EN ISO 10156:2018/A1:2026 is not a complete standalone method. It changes a limited part of ISO 10156:2017, so users need the base standard to understand how the revised coefficient fits into the full outlet-selection process.

Impact on product and documentation control

For manufacturers and gas suppliers, the amendment means product classifications, valve outlet choices, and related technical files may need to be checked against the updated table entry. For quality and compliance teams, the key task is to verify that the current amendment is the one being used in internal specifications and customer documentation.

What terms does SIST EN ISO 10156:2018/A1:2026 define?

SIST EN ISO 10156:2018/A1:2026 uses a small set of technical terms that matter for outlet selection.

• Fire potential - the property assessed to judge how a gas or gas mixture may contribute to fire behavior when choosing a cylinder valve outlet.
• Oxidizing ability - the ability of a gas or gas mixture to promote combustion, which is part of the outlet-selection assessment.
• Cylinder valve outlets - the outlet connection on a cylinder valve that must match the gas category for safe use.
• Gas mixtures - combinations of gases assessed under the same outlet-selection method as single gases.
• Ci coefficient - the coefficient used in Table 4 as part of the classification method; this amendment updates the fluorine entry.

Who uses SIST EN ISO 10156:2018/A1:2026?

SIST EN ISO 10156:2018/A1:2026 is used by gas cylinder manufacturers, industrial gas suppliers, filling and distribution operations, and laboratories that classify gases for cylinder outlet selection. Quality managers and regulatory or conformity teams use it to check that the outlet chosen for a gas or gas mixture matches the hazard assessment in the standard. It is also relevant to engineers who maintain product specifications and technical files for gas cylinders.

What changed in SIST EN ISO 10156:2018/A1:2026 from the previous edition?

SIST EN ISO 10156:2018/A1:2026 is Amendment 1 to ISO 10156:2017. The amendment states two changes:

• Clause 5.3.2, Table 4 - the Ci coefficient entry for fluorine is revised.
• Bibliography - a report on determining oxidizing ability of gases and gas mixtures is added.

Which standards are used with SIST EN ISO 10156:2018/A1:2026?

SIST EN ISO 10156:2018/A1:2026 is used with ISO 10156:2017, which is the base standard it amends. The page also identifies the European parallel draft EN ISO 10156:2017/prA1, showing the same amendment in the parallel EN/ISO process.

What does the SIST EN ISO 10156:2018/A1:2026 document contain?

SIST EN ISO 10156:2018/A1:2026 is a short amendment document rather than a full standard. Its content centers on one technical correction in Clause 5.3.2, Table 4, and one added bibliography entry. The front matter identifies the document in Slovenian, English, German, and French, and the amendment text shows exactly where the base standard is updated. For users, the important part is that the document tells them what to change in the original method and where to look for supporting background.

SLOVENSKI STANDARD
01-december-2026
Plinske jeklenke - Plini in zmesi plinov - Določanje stopnje vnetljivosti in
oksidativnosti za izbiro izhodnega priključka ventila za jeklenko - Dopolnilo A1
(ISO 10156:2017/Amd 1:2026)
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/Amd
1:2026)
Gasflaschen - Gase und Gasgemische - Bestimmung der Brennbarkeit und des
Oxidationsvermögens zur Auswahl von Ventilausgängen - Änderung 1 (ISO
10156:2017/Amd 1:2026)
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 (ISO
10156:2017/Amd 1:2026)
Ta slovenski standard je istoveten z: EN ISO 10156:2017/A1:2026
ICS:
23.020.35 Plinske jeklenke Gas cylinders
71.100.20 Industrijski plini Gases for industrial
application
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 10156:2017/A1
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2026
EUROPÄISCHE NORM
ICS 23.020.35; 71.100.20
English Version
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/Amd 1:2026)
Bouteilles à gaz - Gaz et mélanges de gaz - Gasflaschen - Gase und Gasgemische - Bestimmung der
Détermination du potentiel d'inflammabilité et Brennbarkeit und des Oxidationsvermögens zur
d'oxydation pour le choix des raccords de sortie de Auswahl von Ventilausgängen - Änderung 1 (ISO
robinets - Amendement 1 (ISO 10156:2017/Amd 10156:2017/Amd 1:2026)
1:2026)
This amendment A1 modifies the European Standard EN ISO 10156:2017; it was approved by CEN on 20 June 2026.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of
this amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This amendment exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10156:2017/A1:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 10156:2017/A1:2026) has been prepared by Technical Committee ISO/TC 58
"Gas cylinders" in collaboration with Technical Committee CEN/TC 23 “Transportable gas cylinders” the
secretariat of which is held by BSI.
This Amendment to the European Standard EN ISO 10156:2017 shall be given the status of a national
standard, either by publication of an identical text or by endorsement, at the latest by April 2027, and
conflicting national standards shall be withdrawn at the latest by April 2027.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North
...