EN ISO 14456:2016

SLOVENSKI STANDARD
01-maj-2017
3OLQVNHMHNOHQNH/DVWQRVWLSOLQDLQSULSDGDMRþLUD]YUVWLWYHQLUD]UHGL)76&,62

Gas cylinders - Gas properties and associated classification (FTSC) codes (ISO
14456:2015)
Gasflaschen - Eigenschaften von Gasen und zugehörige Klassifizierungscodes (FTSC)
(ISO 14456:2015)
Bouteilles à gaz - Propriétés des gaz et codes de classification associés (FTSC) (ISO
14456:2015)
Ta slovenski standard je istoveten z: EN ISO 14456:2016
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
September 2016
EUROPÄISCHE NORM
ICS 23.020.30
English Version
Gas cylinders - Gas properties and associated classification
(FTSC) codes (ISO 14456:2015)
Bouteilles à gaz - Propriétés des gaz et codes de Gasflaschen - Eigenschaften von Gasen und zugehörige
classification associés (FTSC) (ISO 14456:2015) Klassifizierungscodes (FTSC) (ISO 14456:2015)
This European Standard was approved by CEN on 2 September 2016.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14456:2016 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 14456:2015 has been prepared by Technical Committee ISO/TC 58 “Gas cylinders” of
the International Organization for Standardization (ISO) and has been taken over as EN ISO 14456:2016
by 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 March 2017, and conflicting national standards shall
be withdrawn at the latest by March 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 14456:2015 has been approved by CEN as EN ISO 14456:2016 without any modification.
INTERNATIONAL ISO
STANDARD 14456
First edition
2015-09-15
Gas cylinders — Gas properties and
associated classification (FTSC) codes
Bouteilles à gaz — Propriétés des gaz et codes de classification
associés (FTSC)
Reference number
ISO 14456:2015(E)
©
ISO 2015
ISO 14456:2015(E)
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
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Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved

ISO 14456:2015(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Gas properties . 2
4.1 Numerical gas code (FTSC) . 2
4.1.1 General. 2
4.1.2 Fire potential, category I . 2
4.1.3 Acute toxicity, category II . 3
4.1.4 State of the gas (in the cylinder at 15 °C), category III . 3
4.1.5 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
Bibliography .17
ISO 14456:2015(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 documents 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 drawn to the possibility that some of the elements of this document may be the subject of
patent rights. 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 www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT), see the following URL: Foreword — Supplementary information.
The committee responsible for this document is ISO/TC 58, Gas cylinders, SC 2, Cylinder fittings.
iv © ISO 2015 – All rights reserved

ISO 14456:2015(E)
Introduction
This International Standard establishes a method of allocating a four-digit code number (FTSC) to any
gas, 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 the gas, and corrosiveness (see 4.1).
FTSC is the abbreviation of these properties.
The FTSC code enables a gas, liquids that are transported under pressure or gas mixture to be assigned
to one of the 15 “compatible” gas groups.
The FTSC codes and the method for their determination are currently given in ISO 5145:2014, Annex
A for use in the selection of valve outlets. This annex from ISO 5145 will be removed when the present
standard is published.
The properties and the selection criteria are aligned as appropriate with the Globally Harmonized
System for the Classification and Labelling of Chemicals (GHS).
INTERNATIONAL STANDARD ISO 14456:2015(E)
Gas cylinders — Gas properties and associated
classification (FTSC) codes
1 Scope
This International Standard gives a list of FTSC (fire potential, i.e. “oxidizing potential 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 gas material compatibility which is covered by ISO 11114 (all parts).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 10156, Gases and gas mixtures — Determination of fire potential and oxidizing ability for the selection
of cylinder valve outlets
ISO 10298, Determination of toxicity of a gas or gas mixture
ISO 10286:2015, Gas cylinders — Terminology
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
gas mixture
combination of different single gases deliberately mixed in specified proportions
[SOURCE: ISO 10286:2015, definition 704]
3.2
liquefied gas
gas, which, when packaged for transport, is partially liquid (or solid) at temperature above −50 °C
[SOURCE: ISO 10286:2015, definition 706]
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 10286:2015, definition 705]
ISO 14456:2015(E)
3.4
lethal concentration 50
LC
concentration of a gas (or a gas mixture) in air administered by a single exposure during a short period
of time (24 h or less) to a group of young adult albino rats (males and females) which leads to the death
of half of the animals in at least 14 d
[SOURCE: ISO 10298:2010, definition 2.1]
4 Gas properties
4.1 Numerical gas code (FTSC)
4.1.1 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, defining 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).
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 below.
4.1.2 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 );
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 ignition exists when the oxygen partial pressure is more than 30 bar;
c) For valves 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.
2 © ISO 2015 – All rights reserved

ISO 14456:2015(E)
4.1.3 Acute toxicity, category II
Subdivision 0: supporting human life;
Subdivision 1: non-toxic LC > 0,5 % by volume (5 000 ppm);
50 rat 1h
Subdivision 2: toxic; 0,02 % by volume (200 ppm) < LC ≤ 0,5 % by volume (5 000 ppm);
50 rat 1h
Subdivision 3: very toxic LC < 0,02 % by volume (200 ppm).
50 rat 1h
NOTE See ISO 10298 for more information.
4.1.4 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 (North America) or 250 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 might 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 (i.e. 182 bar or 250 bar).
Subdivision 7: high pressure range, the lower limit (182 bar or 250 bar) 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 the tables in 5.3, 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 USA.
4.1.5 Corrosiveness, category IV
Subdivision 0: non-corrosive;
Subdivision 1: non-halogen acid forming;
Subdivision 2: basic;
ISO 14456:2015(E)
Subdivision 3: halogen acid forming.
NOTE See ISO 13338 for more information.
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 one of the 15 “compatible” gas groups listed in the table below.
NOTE Attention is drawn to the fact that the only purpose of the numerical code is to group compatible
gases together in order that particular valve outlets might 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
b
2 Carbon dioxide
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
b
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
b a
10 Oxygen
b
11 Nitrous oxide
12 Oxidant, toxic, and/or corrosive gases and qualifying gas mixtures
13 Flammable gases and qualifying gas mixtures subject to decomposition or polymerization
b
14 Acetylene
15 Oxidant, non-toxic, and non-corrosive gas mixtures
a
In ISO 5145, characteristics of group 10 is “oxygen and high pressure oxidant”. Terms and “high pressure oxidant” will
be removed during the next revision of ISO 5145.
b
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 International Standard, a gas mixture is defined as an intentional combination
of two or more gases, which might be either in the gaseous phase or liquefied under pressure when in a
gas cylinder.
NOTE This International Standard 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 ability,
4 © ISO 2015 – All rights reserved

ISO 14456:2015(E)
toxicity, and corrosiveness of the final mixture. The determination of flammability and oxidizing ability
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).
NOTE Tables 2 to 15 are based on, but have been expanded, from ISO 5145. These tables will be removed
when this International Standard has been published and ISO 5145 will be revised.
Table 16 gives the complete list of gases in alphabetical order.
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)
Gas FTSC code Synonym CAS Number
Bromochlorodifluoromethane 0100 R12B 1 353–59–3
a
Bromochloromethane 0100 Halon 1011 74–97–5
Bromotrifluoromethane 0100 Trifluorobromomethane R13B1 75–63–8
Chlorodifluoromethane 0100 Monochlorodifluoromethane R22 75–46–6
Chlorodifluoromethane and azeotropic mixture
0100 R502
Chloropentafluoroethane
a
Chloroheptafluorocyclobutane 0100 C317 377–41–3
Monochloropentafluoroethane 76–15–3
Chloropentafluoroethane 0100
R115
1-Chloro-1,2,2,2-tetrafluoroethane 0100 R124 28–37–89–0
1-Chloro-2,2,2-trifluoroethane 0100 R 133a 75–88–7
Chlorotrifluoromethane 0100 Monochlorotrifluoromethane R1 3 75–72–9
Chlorotrifluoromethane and azeotropic mixture
0100 R503
Trifluoromethane
a
1, 2-Dibromotetrafluoroethane 0100 R114B2 174–73–2
1, 2-Dichlorodifluoroethylene 0100 R1112a 79–35–6
Dichlorodifluoromethane 0100 R12 75–71–8
Dichlorodifluoromethane and azeotropic mixture
0100 R500
1,1-Difluoroethane
Dichlorofluoromethane 0100 R21
...