SIST EN ISO 14456:2024

SLOVENSKI STANDARD
01-oktober-2024
Nadomešča:
SIST EN ISO 14456:2017
SIST EN ISO 14456:2017/A1:2019
Plinske jeklenke - Lastnosti plina in pripadajoči razvrstitveni razredi (FTSC) (ISO
14456:2024)
Gas cylinders - Gas properties and associated classification (FTSC) codes (ISO
14456:2024)
Gasflaschen - Eigenschaften von Gasen und zugehörige Klassifizierungscodes (FTSC)
(ISO 14456:2024)
Bouteilles à gaz - Propriétés des gaz et codes de classification associés (FTSC) (ISO
14456:2024)
Ta slovenski standard je istoveten z: EN ISO 14456:2024
ICS:
23.020.35 Plinske jeklenke Gas cylinders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 14456
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2024
EUROPÄISCHE NORM
ICS 23.020.35 Supersedes EN ISO 14456:2016, EN ISO
14456:2016/A1:2019
English Version
Gas cylinders - Gas properties and associated classification
(FTSC) codes (ISO 14456:2024)
Bouteilles à gaz - Propriétés des gaz et codes de Gasflaschen - Eigenschaften von Gasen und zugehörige
classification associés (FTSC) (ISO 14456:2024) Klassifizierungscodes (FTSC) (ISO 14456:2024)
This European Standard was approved by CEN on 19 April 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a 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 European Standard 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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14456:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 14456:2024) 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 European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by November 2024, and conflicting national standards
shall be withdrawn at the latest by November 2024.
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 supersedes EN ISO 14456:2016.
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 Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 14456:2024 has been approved by CEN as EN ISO 14456:2024 without any modification.

International
Standard
ISO 14456
Second edition
Gas cylinders — Gas properties and
2024-04
associated classification (FTSC) codes
Bouteilles à gaz — Propriétés des gaz et codes de classification
associés (FTSC)
Reference number
ISO 14456:2024(en) © ISO 2024
ISO 14456:2024(en)
© ISO 2024
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 14456:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Gas properties - Numerical gas code (FTSC) . 2
4.1 General .2
4.2 Fire potential, category I .2
4.3 Acute toxicity, category II .2
4.4 State of the gas (in the cylinder at 15 °C), category III .3
4.5 Corrosiveness, category IV .3
5 List of gases and liquids with the corresponding FTSC codes . 4
5.1 Basic principles and single gases .4
5.2 Assignment of a gas mixture to a group .4
5.3 Tables of compatible groups of gases and liquids .5
Annex A (informative) Chemical and hazard data related to additional proposed FTSC entries . 19
Bibliography .43

iii
ISO 14456:2024(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,
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 58, Gas cylinders, Subcommittee SC 2, Cylinder
fittings, in collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/
TC 23, Transportable gas cylinders, in accordance with the Agreement on technical cooperation between ISO
and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 14456:2015), which has been technically
revised. It also incorporates the Amendment ISO 14456:2015/Amd.1:2019.
The main changes are as follows:
— corrections to CAS numbers and FTSC codes;
— consequential revisions as a result of a new edition of ISO 5145;
— addition of new FTSC codes for commonly used gases and liquids.
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 14456:2024(en)
Introduction
This document establishes a method of allocating a four-digit code number (FTSC) to any gases and
liquids that are transported under pressure or mixture of gases contained in cylinders. This code number
categorizes the gas, liquids that are transported under pressure or gas mixture in terms of its physical-
chemical properties and/or flammability, toxicity, state of gas, and corrosiveness (see 4.1). FTSC is the
abbreviation of these properties.
The FTSC code enables gases and liquids that are transported under pressure or gas mixtures to be assigned
to one of the 15 “compatible” gas groups.
The properties and the selection criteria are aligned as appropriate with the Globally Harmonized System of
[11]
Classification and Labelling of Chemicals (GHS).

v
International Standard ISO 14456:2024(en)
Gas cylinders — Gas properties and associated classification
(FTSC) codes
1 Scope
This document gives a list of FTSC (fire potential, i.e. “oxidizing power and flammability”, toxicity, state of
the gas, and corrosiveness) codes determined according to the relevant properties of gases and of some
liquids that are transported under pressure.
It does not cover material compatibility with gases which is covered by the ISO 11114 series.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological 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/
3.1
gas mixture
combination of different single gases and/or liquids deliberately mixed in specified proportions resulting in
a homogeneous gaseous mixture
[SOURCE: ISO 10286:2021, 3.5.2, modified]
3.2
liquefied gas
gas, which, when packaged for transport, is partially liquid (or solid) at temperatures above −50 °C
[SOURCE: ISO 10286:2021, 3.5.4]
3.3
compressed gas
gas, which, when packaged under pressure for transport, is entirely gaseous at −50 °C
Note 1 to entry: This category includes all gases with a critical temperature less than or equal to −50 °C.
[SOURCE: ISO 10286:2021, 3.5.3]
3.4
lethal concentration 50
LC
concentration of a substance in air exposure to which, for a specified length of time, is expected to cause the
death of 50 % of the entire defined experimental animal population after a defined time period
Note 1 to entry: Lethal concentration is usually measured as ppm (volume fraction) or mg/m .
[SOURCE: ISO 10298:2018, 3.1, modified — Note 1 to entry has been changed.]

ISO 14456:2024(en)
4 Gas properties - Numerical gas code (FTSC)
4.1 General
The code number assigned to a gas or liquid is based on the following four physical-chemical properties:
a) category I (F): fire potential, i.e. “oxidizing power and flammability”, which defines the gas behaviour
with respect to combustion;
b) category II (T): acute toxicity;
c) category III (S): gas state, defining the physical state of the fluid in the cylinder at 15 °C within a given
pressure range;
d) category IV (C): corrosiveness (ability to damage or destroy living tissues: eyes, skin and mucous
membranes, or the potential for an acid/base chemical reaction).
Each category is subdivided into different characteristics (subdivisions), each identified by a different
digit. In this way, a gas in a given state is characterized by a series of four digits (one digit per category) as
illustrated in 4.1.2 to 4.1.5.
Annex A includes examples of how FTSC codes are rationalized for new entries to this document.
4.2 Fire potential, category I
Subdivision 0: inert (any gas not classified under subdivisions 1 to 5 below).
Subdivision 1: supports combustion (gas having an oxidizing power equal to or less than a mixture
containing 23,5 % of oxygen in nitrogen).
Subdivision 2: flammable (gas having flammability limits in air).
NOTE 1 See ISO 10156 for more information.
Subdivision 3: pyrophoric (spontaneously flammable).
Subdivision 4: oxidizing (gas having an oxidizing power greater than a mixture containing 23,5 % O in N ).
2 2
NOTE 2 See ISO 10156 for more information.
Subdivision 5: chemically unstable (flammable and subject to rapid decomposition or polymerization).
NOTE 3 When considering the properties of gases from subdivisions 1 and 4, the following applies:
a) subdivision 4 considers the risk of accelerating combustion more than air does;
b) for gas/material compatibility with gases under pressure of subdivisions 1 and 4, it is considered that the risk of
1)
ignition exists when the oxygen partial pressure is more than 30 bar ;
c) for valve outlet selection (for example, see ISO 5145), the risk is to mix a flammable gas (subdivision 2 and/or 3)
with a gas of subdivision 1 and/or 4.
4.3 Acute toxicity, category II
Subdivision 0: supporting human life.
Subdivision 1: non-toxic LC (1 h) > 0,5 % by volume (5 000 ppm).
Subdivision 2: toxic; 0,02 % by volume (200 ppm) < LC (1 h) ≤ 0,5 % by volume (5 000 ppm).
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .

ISO 14456:2024(en)
Subdivision 3: very toxic LC (1 h) ≤ 0,02 % by volume (200 ppm).
NOTE See ISO 10298 for more information. For LC values, see ISO 10298:2018, Table B.1.
4.4 State of the gas (in the cylinder at 15 °C), category III
All pressures for compressed gases are working pressures according to the definition given in ISO 10286.
For liquefied gases, this is the developed pressure at 65 °C (normally equal to the cylinder test pressure).
Subdivision 0: liquefied gas of 35 bar or less.
Subdivision 1: liquefied gas at a pressure greater than 35 bar.
Subdivision 2: liquid withdrawal – liquefied gas (optional).
Subdivision 3: dissolved gas.
Subdivision 4: gas phase withdrawal at 35 bar or less.
Subdivision 5: compressed gas between 35 bar and 250 bar (Europe).
Subdivision 6: compressed gas between 35 bar and 207 bar (North America).
Subdivision 7: compressed gas above 207 bar and up to 350 bar (North America) or above 250 bar up to
350 bar (Europe).
NOTE 1 Subdivisions 5 and 6 have been adopted as a result of a compromise between the European and the North
American approach. The European preference for a limit of 250 bar reflects the current tendency towards higher
pressure applications. The current North American practice requires a limit of 207 bar for which their pressure
reducing valves are designed. This is the working pressure at the referenced temperature of 15 °C. Therefore, three
pressure classes have been retained. Other jurisdictions can use different values.
Either subdivision 5 or subdivision 6 shall be used, never both. The selection of either subdivision will
determine the applicable pressure for subdivision 7.
Subdivision 5 or 6: medium pressure range, each user being required to select one subdivision exclusively to
determine the upper limit of the medium pressure range.
Subdivision 7: high pressure range, the lower limit of which depends on the subdivision selected for the
medium pressure range.
After the introduction of subdivisions 5, 6, and 7, a number of pressure ranges have been (or are being)
established to make the selection of the proper cylinder valve outlet connection (e.g. 500 bar, 800 bar,
sub atmospheric pressure). These ranges have been chosen to protect downstream regulators and other
ancillary equipment from over-pressurized conditions. Consequently, for Table 2 to Table 16, the third digit
(S) used for all compressed gases is “5” to indicate that this is a compressed gas.
NOTE 2 Subdivisions 8 and 9 have been allocated for liquid withdrawal cylinders of cryogenic gases in the US.
4.5 Corrosiveness, category IV
Subdivision 0: non-corrosive.
Subdivision 1: non-halogen acid forming.
Subdivision 2: basic.
Subdivision 3: halogen acid forming.
NOTE See ISO 13338 for more information. For corrosiveness subdivisions, see ISO 13338:2022, Table 1.

ISO 14456:2024(en)
5 List of gases and liquids with the corresponding FTSC codes
5.1 Basic principles and single gases
The FTSC code enables the assignment of any gas (including gas mixtures) or any liquid to be packaged
under pressure to one of the 15 “compatible” gas groups listed in the table below.
NOTE The only purpose of the numerical code is to group compatible gases together in order that particular valve
outlets can be assigned to each group. Use of the code is limited only to the assignment of valve outlets.
Table 1 — Characteristics of groups
Group Characteristics
1 Non-flammable, non-toxic gases and qualifying gas mixtures, less stable thermally than group 3
a
2 Carbon dioxide
3 Non-flammable, non-toxic, and thermally stable gases (except carbon dioxide) and qualifying gas mixtures
4 Non-flammable, toxic, and corrosive (or corrosive by hydrolysis) gases and qualifying gas mixtures
a
5 Air
6 Flammable and non-toxic gases and qualifying gas mixtures
7 Flammable, toxic, and corrosive (basic) gases and qualifying gas mixtures
8 Flammable, toxic, and corrosive (acidic) or non-corrosive gases and qualifying gas mixtures
9 Spontaneously flammable gases and qualifying gas mixtures
a
10 Oxygen
a
11 Nitrous oxide
12 Oxidizing, toxic, and/or corrosive gases and qualifying gas mixtures
13 Flammable gases and qualifying gas mixtures subject to rapid decomposition or polymerization
a
14 Acetylene
15 Oxidizing, non-toxic, and non-corrosive gas mixtures
a
Groups 2, 5, 10, 11 and 14 only contain one single gas and are assigned to individual named gases from which mixtures and
other gases are excluded.
5.2 Assignment of a gas mixture to a group
For the purposes of this document, a gas mixture is defined as an intentional combination of two or more
gases, which can be either in the gaseous phase or liquefied under pressure when in a gas cylinder.
NOTE This document does not attempt to identify gas mixtures which can be safely and satisfactorily prepared;
this is the responsibility of the gas manufacturer. It does not describe any methods or techniques for preparing gas
mixtures.
The principle of allocation of a four-digit numerical code (FTSC) to gas mixtures is the same as that for
single gases. The allocation of the FTSC code to a gas mixture, which allows the assignment of this mixture
to one of the group of gases and gas mixtures (see Table 1), depends on the flammability, oxidizing power,
toxicity and corrosiveness of the final mixture. The determination of flammability and oxidizing power is
given in ISO 10156, that of toxicity in ISO 10298, and that for corrosiveness in ISO 13338.
Mixtures containing spontaneously flammable gases (i.e. pyrophoric gases such as silane in Table 10) shall
be considered as spontaneously flammable gas mixtures if the content of the pyrophoric gas(es) is more
than 1 % (by volume).
Table 16 gives the complete list of gases in alphabetical order.

ISO 14456:2024(en)
5.3 Tables of compatible groups of gases and liquids
Table 2 — Gases and gas/liquid mixtures belonging to group 1 (non-flammable, non-toxic gases and
gas mixtures, less stable thermally than group 3)
CAS Registry
Gas FTSC code Synonym
®b
Number
Bromochlorodifluoromethane 0100 R12B1 353–59–3
a
Bromochloromethane 0100 Halon 1011 74–97–5
Bromotrifluoromethane 0100 Trifluorobromomethane, R13B1 75–63–8
Chlorodifluoromethane 0100 Monochlorodifluoromethane, R22 75–45–6
Chlorodifluoromethane and Chloropen- azeotropic mixture
0100 R502
tafluoroethane
a
Chloroheptafluorocyclobutane 0100 C317 377–41–3
Chloropentafluoroethane 0100 Monochloropentafluoroethane, R115 76–15–3
1-Chloro-1,2,2,2-tetrafluoroethane 0100 R124 2837–89–0
1-Chloro-2,2,2-trifluoroethane 0100 R133a 75–88–7
Chlorotrifluoromethane 0100 Monochlorotrifluoromethane, R13 75–72–9
Chlorotrifluoromethane and Trifluo- azeotropic mixture
0100 R503
romethane
a
1,2 - dibromo-1,1-difluoroethane 0100 75-82-1
a
1,2-Dibromotetrafluoroethane 0100 R114B2 124–73–2
1,2-Dichlorodifluoroethylene 0100 R1112a 79–35–6
Dichlorodifluoromethane 0100 R12 75–71–8
Dichlorodifluoromethane and 1,1-Dif- azeotropic mixture
0100 R500
luoroethane
Dichlorofluoromethane 0100 R21 75–43–4
a
1,2-Dichlorohexafluorocyclobutane 0100 C316 356–18–3
1,1-Dichlorotetrafluoroethane 0100 R114a 374–07–2
1,2-Dichlorotetrafluoroethane 0100 R114 76–14–2
a
2,2-Dichloro-1,1,1–trifluoroethane 0100 R123 306–83–2
Difluoromethane, Pentafluoroethane, zeotropic mixture
0100 R407A, R407B, R407C
and 1,1,1,2-Tetrafluoroethane
Heptafluoropropane 0100 R227 431–89–0
Hexafluoroethane 0100 Perfluoroethane, R116 76–16–4
Hexafluoropropylene 0100 Hexafluoropropene, R1216 116–15–4
a
Methylene bromide 0100 Dibromomethane 74-95-3
Octafluorobut-2-ene 0100 R1318 360–89–4
Octafluorocyclobutane 0100 Perfluorocyclobutane, RC318 115–25–3
Octafluoropropane 0100 Perfluoropropane, R218 76–19–7
a
Pentachlorofluoroethane 0100 29756–45–4
Pentafluoroethane 0100 R125 354–33–6
Pentafluoroethane,
1,1,1-Trifluoroethane, and 0100 R404A
1,1,1,2-Tetrafluoroethane zeotropic mixture
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.
b ®
Chemical Abstracts Service (CAS) Registry Number is a trademark of the American Chemical Society (ACS). This
information is given for the convenience of users of this document and does not constitute an endorsement by ISO of the product
named. Equivalent products may be used if they can be shown to lead to the same results.

ISO 14456:2024(en)
TTaabblle 2 e 2 ((ccoonnttiinnueuedd))
CAS Registry
Gas FTSC code Synonym
®b
Number
a
Pentafluoroethyliodide 0100 354–64–3
Perfluorobutane 0100 R610 355–25–9
Sulfur hexafluoride 0100 2551–62–4
1,1,1,2-Tetrachlorodifluoroethane (solid) 0100 R112a 76–11–9
a
1,1,2,2-Tetrachlorodifluoroethane 0100 R112 76–12–0
a
Tetrachloromethane 0100 Carbon tetrachloride 56-23-5
1,1,2,2-Tetrafluoro-1-chloroethane 0100 R124a 354–25–6
1,1,1,2-Tetrafluoroethane 0100 R134a 811–97–2
a
1,1,2-Trichloroethene 0100 Trichloroethylene 79-01-6
a
Trichlorofluoromethane 0100 Trichloromonofluoromethane, R11 75–69–4
a
1,1,1-Trichlorotrifluoroethane 0100 R113a 354–58–5
a
1,1,2-Trichlorotrifluoroethane 0100 R113 76–13–1
Trifluoromethane 0100 Fluoroform, R23 75–46–7
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.
b ®
Chemical Abstracts Service (CAS) Registry Number is a trademark of the American Chemical Society (ACS). This
information is given for the convenience of users of this document and does not constitute an endorsement by ISO of the product
named. Equivalent products may be used if they can be shown to lead to the same results.
Table 3 — Gases belonging to group 2 (carbon dioxide)
CAS Registry
Gas FTSC code Synonym ®
Number
Carbon dioxide 0110 Carbonic acid anhydride, R744 124–38–9
Table 4 — Gases and gas mixtures belonging to group 3 (non-flammable, non-toxic, and thermally
stable gases and gas mixtures)
CAS Registry
Gas FTSC code Synonym ®
Number
Argon 0150 7440–37–1
Helium 0150 7440–59–7
Krypton 0150 7439–90–9
Neon 0150 7440–01–9
Nitrogen 0150 7727–37–9
a
Xenon 0110 7440–63–3
Tetrafluoromethane 0150 Carbon tetrafluoride, R14 75–73–0
a
FTSC code due to the gas having a critical temperature above 15 °C.

ISO 14456:2024(en)
Table 5 — Gases and gas mixtures belonging to group 4 (non-flammable, toxic, and corrosive (or
corrosive by hydrolysis) gases and gas mixtures)
CAS Registry
c
Gas FTSC code Synonym ®
Number
a
Antimony pentafluoride 0303 7783–70–2
Arsenic pentafluoride 0303 7784-36-3
Boron trichloride 0203 Boron chloride 10294–34–5
Boron trifluoride 0253 Boron fluoride 7637–07–2
a b
Bromoacetone (0303)-2203 598–31–2
Bromodifluoromethane 0100 R22B1 1511-62-2
Carbonyl fluoride 0213 Fluorophosgene 353–50–4
Cyanogen chloride 0303 506–77–4
Deuterium chloride 0213 7698–05–7
Deuterium fluoride 0203 14333–26–7
a
Dibromodifluoromethane 0100 R12B2 75–61–6
a
Dichloro-2-chlorovinyl arsine 0303 Lewisite 541–25–3
a
Diphosgene 0303 503–38–8
a
Ethyldichloroarsine 0303 598–14–1
a
Germanium tetrachloride 0203 Germanium chloride 10038-98-9
Germanium tetrafluoride 0203 Germanium fluoride 7783-58-6
1,1,1,3,3,3,-hexafluoro-2-pro- 684–16–2
Hexafluoroacetone 0203
panone
Hydrogen bromide 0203 Hydrobromic acid (anhydrous) 10035–10–6
Hydrogen chloride 0213 Hydrochloric acid (anhydrous) 7647–01–0
a
Hydrogen fluoride 0203 Hydrofluoric acid (anhydrous) 7664–39–3
Hydrogen iodide 0203 Hydroiodic acid (anhydrous) 10034–85–2
b
Iodotrifluoromethane (0200)-0100 Trifluoromethyl iodide 2314–97–8
b
Methyl bromide (0300)-2200 Bromomethane 74–83–9
a
Methyldichloroarsine 0303 593–89–5
a
Methyl iodide 0223 Iodomethane 74-88-4
Nitrosyl chloride 0303 2696–92–6
a
Octafluorocyclopentene 0220 559-40-0
b
Perfluoro-2-butene (0200)- 0100 Octafluorobutene; R1318 360–89–4
a b
Phenylcarbylamine Chloride (0303)-2303 622–44–6
Phosgene 0303 Carbonyl chloride 75–44–5
Phosphorus pentafluoride 0203 7647–19–0
Phosphorus trifluoride 0203 7783–55–3
a
Silicon tetrachloride 0203 10026–04–7
Silicon tetrafluoride 0253 Tetrafluorosilane 7783–61–1
Sulfur dioxide 0201 R764 7446–09–5
Sulfur tetrafluoride 0303 7783–60–0
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.
b
To be consistent with ISO 10298, the former FTSC code is completed by the new one in bold figures corresponding to the new
toxicity level.
c
Some gases with an FTSC code of 0100 are listed in Table 5 because they historically have been assigned valve outlet
connections specified for this group, see ISO 5145.

ISO 14456:2024(en)
TTaabblle 5 e 5 ((ccoonnttiinnueuedd))
CAS Registry
c
Gas FTSC code Synonym ®
Number
Sulfuryl fluoride 0200 Sulfuryl difluoride 2699–79–8
Tungsten hexafluoride 0203 7783–82–6
Uranium hexafluoride (liquid/solid, class 7) 0303 7783–81–5
2)
NOTE  The FTSC codes in brackets are from ISO 5145:1990.
This explains why the corresponding gases are in this table.
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.
b
To be consistent with ISO 10298, the former FTSC code is completed by the new one in bold figures corresponding to the new
toxicity level.
c
Some gases with an FTSC code of 0100 are listed in Table 5 because they historically have been assigned valve outlet
connections specified for this group, see ISO 5145.
Table 6 — Gases belonging to group 5 (air)
CAS Registry
Gas FTSC code Synonym ®
Number
Air 1050 132259–10–0
Table 7 — Gases and gas mixtures belonging to group 6 (flammable and non-toxic gases and gas
mixtures)
CAS Registry
Gas FTSC code Synonym ®
Number
Allene 2100 Propadiene 463–49–0
Bromotrifluoroethylene 2100 R113B1 598–73–2
Butane 2100 106–97–8
1-Butene 2100 Butylene 106–98–9
Cis-2-Butene 2100 Butylene 590–18–1
Trans-2-Butene 2100 Butylene 624–64–6
1-Chloro-1,1-difluoroethane 2100 R142b 75–68–3
Chlorofluoromethane 2100 R31 593–70–4
Cyclobutane 2100 287-23-0
Deuterium 2150 7782–39–0
a
1,2-Dichloroethylene 2120 1,2-Dichloroethene 540-59-0
a
Dichloromethane 2100 75-09-2
1,1-Difluoroethane 2100 Ethylidene fluoride, R152a 75–37–6
Difluoromethane 2100 Methylene fluoride, R32 75–10–5
1,1-Difluoroethylene 2110 Vinylidene fluoride, R1132a 75–38–7
Dimethylether 2100 Methyl ether 115–10–6
a
2,2-Dimethylpropane 2100 Tetramethylmethane 463–82–1
Ethane 2110 R170 74–84–0
Ethylacetylene 2100 1-Butyne 107–00–6
a
Ethyl chloride 2100 Chloroethane, R160 75–00–3
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.
2) Now withdrawn. Replaced by ISO 5145:2017.

ISO 14456:2024(en)
TTaabblle 7 e 7 ((ccoonnttiinnueuedd))
CAS Registry
Gas FTSC code Synonym ®
Number
Ethylene 2150 Ethene, R1150 74–85–1
a
Ethyl ether 2100 Diethyl ether 60–29–7
Ethyl fluoride 2100 Fluoroethane, R161 353-36-6
a
Ethyl mercaptan 2100 ethanethiol 75-08-1
Hydrogen 2150 1333–74–0
Hydrogen absorbed in metal alloy (reversible
metal hydride)
a
Isobutane 2100 Trimethylmethane, R600 75–28–5
Isobutylene 2100 2-Methylpropene, Isobutene 115–11–7
Methane 2150 R50 74–82–8
Methylacetylene 2100 Allylene; Propyne 74–99–7
a
3-Methyl-1-butene 2100 Isoamylene,Isopropylethylene 563–45–1
Methyl ethyl ether 2100 Ethyl methyl ether 540–67–0
Methyl fluoride 2110 Fluoromethane, R41 593–53–3
a
Methyl formate 2100 Methyl methanoate 107-31-3
a
Methyl sulfide 2100 Dimethyl sulfide 75-18-3
Natural gas 2150 mixture
Propane 2100 R290 74–98–6
Propylene 2100 Propene, R1270 115–07–1
2,3,3,3-Tetrafluoropropene 2100 R1234yf 754–12–1
a
Tetramethylsilane 2100 75-76-3
1,1,1-Trifluoroethane 2100 R143a 420–46–2
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.
Table 8 — Gases and gas mixtures belonging to group 7 (flammable, toxic, and corrosive (basic)
gases and gas mixtures)
CAS Registry
Gas FTSC code Synonym ®
Number
Ammonia 2102 R717 7664–41–7
Dimethylamine 2102 124–40–3
a
Monoethylamine 2102 Ethylamine, R631 75–04–7
Monomethylamine 2102 Methylamine, R630 74–89–5
Trimethylamine 2102 75–50-3
a
Trisilylamine 3202 Silanamine, N,N-disilyl- 13862-16-3
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.

ISO 14456:2024(en)
Table 9 — Gases and gas mixtures belonging to group 8 (flammable, toxic, and corrosive (acidic) or
non-corrosive gases and gas mixtures)
CAS Registry
Gas FTSC code Synonym ®
Number
a
Acrylonitrile 2200 107-13-1
Arsine 2300 7784–42–1
a
Carbon disulfide 2100 75-15-0
Carbon monoxide 2250 630–08–0
Carbonyl sulfide 2201 Carbonoxylsulfide 463–58–1
b
Chloromethane (2200)-2100 Methyl chloride, R40 74–87–3
Cyanogen 2200 460–19–5
b
Cyclopropane (2200)-2100 Trimethylene 75–19–4
Deuterium selenide 2301 13536–95–3
Deuterium sulfide 2201 13536–94–2
Dichlorosilane 2203 4109–96–0
b
Dimethylsilane (2300)-2100 1111–74–6
Germane 2200 7782–65–2
a
Heptafluorobutyronitrile 2300 375–00–8
Hexafluorocyclobutene 2100 697–11–0
Hydrogen selenide 2301 7783–07–5
Hydrogen sulfide 2201 7783–06–4
a
Methyl disulfide 2200 624-92-0
Methyl mercaptan 2201 Methanethiol 74–93–1
b
Methylsilane (2300)-2100 992–94–9
Monochlorosilane 3203 13465-78-6
a
Nickel carbonyl 2300 Nickel tetracarbonyl 13463–39–3
Pentafluoropropionitrile 2300 422–04–8
Perfluorobutadiene 2200 685-63-2
a
Tetraethyl lead 2300 78–00–2
a
Tetramethyl lead 2200 75–74–1
a
Trichlorosilane 2203 10025-78-2
Trifluoroacetonitrile 2200 353–85–5
Trifluoroethylene 2200 359–11–5
b
Trimethylsilane (2300)-2100 993–07–7
NOTE  The FTSC codes in brackets are from ISO 5145:1990. This explains why the corresponding gases are in this table.
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.
b
To be consistent with ISO 10298, the former FTSC code is completed by the new one in bold figures corresponding to the new
toxicity level.
ISO 14456:2024(en)
Table 10 — Gases and gas mixtures belonging to group 9 [pyrophoric (spontaneously flammable)
gases and gas mixtures]
CAS Registry
Gas FTSC code Synonym ®
Number
a
Diethylzinc 3100 557–20–0
a
Pentaborane 3300 19624–22–7
Phosphine 3310 7803–51–2
Silane 3150 Silicon tetrahydride 7803–62–5
a
Triethyl aluminium 3100 97–93–8
Triethyl borane 3200 97–94–9
Trimethylborane 3200 Trimethylboron 593-90-8
a
Trimethylstibine 3300 594–10–5
a
Trisilane 3100 7783-26-8
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.
Table 11 — Gases belonging to group 10 (oxygen)
CAS Registry
Gas FTSC code Synonym ®
Number
Oxygen 4050 7782–44–7
Table 12 — Gases belonging to group 11 (nitrous oxide)
CAS Registry
Gas FTSC code Synonym ®
Number
Nitrous oxide 4110 10024–97–2
Table 13 — Gases and gas mixtures belonging to group 12 (oxidizing, toxic, and/or corrosive gases
and qualifying gas mixtures)
CAS Registry
Gas FTSC Code Synonym ®
Number
Bis-trifluoromethylperoxide 4300 927–84–4
a
Bromine pentafluoride 4303 7789–30–2
a
Bromine trifluoride 4303 7787–71–5
Chlorine 4203 7782–50–5
Chlorine dioxide 4203 10049-04-4
Chlorine pentafluoride 4303 13637–63–3
Chlorine trifluoride 4203 7790–91–2
Fluorine 4343 7782–41–4
a
Iodine pentafluoride 4303 7783–66–6
Nitric oxide 4351 Nitrogen(II) oxide 10102–43–9
Nitrogen dioxide 4301 10102–44–0
Nitrogen tetroxide 4301 Dinitrogen tetroxide 10544–72–6
Nitrogen trifluoride 4150 7783–54–2
Nitrogen trioxide 4301 Dinitrogen trioxide 10544–73–7
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.

ISO 14456:2024(en)
TTaabblle 1e 13 3 ((ccoonnttiinnueuedd))
CAS Registry
Gas FTSC Code Synonym ®
Number
Nitrosyl fluoride 4303 7789-25-5
Nitryl fluoride 4303 10022-50-1
Oxygen difluoride 4343 7783–41–7
Ozone 4330 10028–15–6
Perchloryl fluoride 4200 7616-94-6
Tetrafluorohydrazine 4343 10036–47–2
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.
Table 14 — Gases and gas mixtures belonging to group 13 (flammable gases and gas mixtures
subject to rapid decomposition or polymerization)
CAS Registry
Gas FTSC code Synonym ®
Number
1,3-Butadiene, stabilized 5100 106–99–0
Chlorotrifluoroethylene, stabilized 5200 R1113 79–38–9
Diborane 5350 19287–45–7
a
Digermane 5200 13818-89-8
Ethylene oxide 5200 Oxirane 75–21–8
a
Hydrogen cyanide, stabilized 5301 Hydrocyanic acid (anhydrous) 74–90–8
Methyl vinyl ether, stabilized 5100 Methoxyethylene 107–25–5
a
Propylene oxide 5100 Methyl oxirane 75–56–9
Stibine 5300 Antimony hydride 7803–52–3
Tetrafluoroethylene, stabilized 5100 R1114 116–14–3
Vinyl bromide, stabilized 5100 593–60–2
Vinyl chloride, stabilized 5100 Chloroethylene, R1140 75–01–4
Vinyl fluoride, stabilized 5100 Fluoroethylene, R1141 75–02–5
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.
Table 15 — Gases and gas mixtures belonging to group 14 (acetylene)
CAS Registry
Gas FTSC code Synonym ®
Number
Acetylene 5130 Ethyne 74–86–2
ISO 14456:2024(en)
Table 16 — Gases in alphabetical order
CAS Registry
Gas FTSC code Synonym ®
Number
Acetylene 5130 Ethyne 74–86–2
a
Acrylonitrile 2200 107-13-1
Air 1050 132259-10-0
Allene 2100 Propadiene 463–49–0
Ammonia 2102 R717 7664–41–7
a
Antimony pentafluoride 0303 7783–70–2
Argon 0150 7440–37–1
Arsenic pentafluoride 0303 7784-36-3
Arsine 2300 7784–42–1
Bis-trifluoromethylperoxide 4300 927–84–4
Boron trichloride 0203 Boron chloride 10294–34–5
Boron trifluoride 0253 Boron fluoride 7637–07–2
a
Bromine pentafluoride 4303 7789–30–2
a
Bromine trifluoride 4303 7787–71–5
a b
Bromoacetone (0303)-2203 598–31–2
Bromochlorodifluoromethane 0100 R12B1 353–59–3
a
Bromochloromethane 0100 Halon 1011 74–97–5
Bromodifluoromethane 0100 R22B1 1511-62-2
Bromotrifluoroethylene 2100 R113B1 598–73–2
Bromotrifluoromethane 0100 Trifluorobromomethane, R13B1 75–63–8
Butane 2100 106–97–8
1,3-Butadiene, stabilized 5100 106–99–0
1-Butene 2100 Butylene 106–98–9
Cis-2-Butene 2100 Butylene 590–18–1
Carbon dioxide 0110 Carbonic acid anhydride, R744 124–38–9
a
Carbon disulfide 2100 75-15-0
Carbon monoxide 2250 630–08–0
Carbonyl fluoride 0213 Fluorophosgene 353–50–4
Carbonyl sulfide 2201 Carbonoxylsulfide 463–58–1
Chlorine 4203 7782–50–5
Chlorine dioxide 4203 10049-04-4
Chlorine pentafluoride 4303 13637–63–3
Chlorine trifluoride 4203 7790–91–2
1-Chloro-1,1-difluoroethane 2100 R142b 75–68–3
Chlorodifluoromethane 0100 Monochlorodifluoromethane, R22 75–45–6
Chlorodifluoromethane and azeotropic
0100 R502
Chloropentafluoroethane mixture
Chlorofluoromethane 2100 R31 593–70–4
a
Chloroheptafluorocyclobutane 0100 C317 377–41–3
a
Some products, being liquid at normal ambient conditions, are included since they can be supplied in non-pressurized
containers. They are included in this grouping because valve outlets are necessary when these products are supplied together
with a propellant in a pressurized container.
b
To be consistent with ISO 10298, the former FTSC code is completed by the new one in bold figures corresponding to the new
toxicity level.
c
FTSC code due to the critical point of the gas of above 15 °C.
...