ISO 11999-9:2025
(Main)PPE for firefighters — Test methods and requirements for PPE used by firefighters who are at risk of exposure to high levels of heat and/or flame while fighting fires occurring in structures — Part 9: Fire hoods
PPE for firefighters — Test methods and requirements for PPE used by firefighters who are at risk of exposure to high levels of heat and/or flame while fighting fires occurring in structures — Part 9: Fire hoods
This document specifies the minimum design and performance requirements for a fire hood as part of personal protective equipment (PPE) to be used by firefighters, primarily but not solely to protect against exposure to flame, high thermal loads and particulate protection.
Équipement de protection personnelle pour pompiers — Méthodes d'essai et exigences pour les équipements de protection personnelle utilisés par les pompiers qui sont à risque d'une exposition à des niveaux élevés de chaleur et/ou de flamme quand la lutte contre les incendies survient dans les structures — Partie 9: Cagoules
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International
Standard
ISO 11999-9
Second edition
PPE for firefighters — Test methods
2025-04
and requirements for PPE used
by firefighters who are at risk of
exposure to high levels of heat
and/or flame while fighting fires
occurring in structures —
Part 9:
Fire hoods
Équipement de protection personnelle pour pompiers —
Méthodes d'essai et exigences pour les équipements de protection
personnelle utilisés par les pompiers qui sont à risque d'une
exposition à des niveaux élevés de chaleur et/ou de flamme quand
la lutte contre les incendies survient dans les structures —
Partie 9: Cagoules
Reference number
© ISO 2025
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 General design requirements . 2
4.1 General .2
4.2 Innocuousness .3
4.3 Flexibility.3
4.4 Facial opening . .3
4.5 Yoke interface area .3
4.6 Sizing .3
4.7 Labels .3
4.8 Seam construction .3
4.9 Particulate protection .3
5 Sampling and pre-treatment . . 4
6 Performance requirements . . 5
6.1 General .5
6.2 Limited flame spread .5
6.2.1 General .5
6.2.2 Flame resistance (surface ignition) .5
6.2.3 Flame resistance (bottom edge) .6
6.3 Heat resistance .7
6.4 Heat transfer (flame exposure) .7
6.5 Heat transfer (radiant exposure) .7
6.6 Heat transfer (combined flame and radiant exposure) .7
6.7 Residual strength of material following radiant heat exposure .8
6.8 Seam bursting strength .8
6.9 Dimensional change .8
6.10 Thread heat resistance.8
6.11 Particulate protection .8
6.12 Water vapour resistance.8
7 Complete fire hood test - opening size retention test . 9
8 Report . 9
9 Compatibility . 9
10 Marking . . 9
11 Information supplied by manufacturer . 9
Annex A (normative) Donning, doffing and shape retention test .10
Annex B (normative) Particulate test .11
Annex C (normative) Determination of property values .12
Annex D (normative) Uncertainty of measurement .13
Bibliography .15
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 94, Personal safety — Protective clothing and
equipment, Subcommittee SC 14, Fire-fighters' personal equipment.
This second edition cancels and replaces the first edition (ISO 11999-9:2016), which has been technically
revised.
The main changes are as follows:
— the design requirement have been amended and added to (particulate protection)
— all the heat and flame properties have been brought to amended single levels (see Table 1);
— all the mechanical properties have been brought to amended single levels (see Table 1);
— additional tests have been added or changed (including resistance evaporative transfer (RET), size
retention)
A list of all parts in the ISO 11999 series can be found on the ISO website.
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
International Standard ISO 11999-9:2025(en)
PPE for firefighters — Test methods and requirements for
PPE used by firefighters who are at risk of exposure to high
levels of heat and/or flame while fighting fires occurring in
structures —
Part 9:
Fire hoods
1 Scope
This document specifies the minimum design and performance requirements for a fire hood as part of
personal protective equipment (PPE) to be used by firefighters, primarily but not solely to protect against
exposure to flame, high thermal loads and particulate protection.
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 3146, Plastics — Determination of melting behaviour (melting temperature or melting range) of semi-
crystalline polymers by capillary tube and polarizing-microscope methods
ISO 3175-2, Textiles — Professional care, drycleaning and wetcleaning of fabrics and garments — Part 2:
Procedure for testing performance when cleaning and finishing using tetrachloroethene
ISO 5077, Textiles — Determination of dimensional change in washing and drying
ISO 6942:2022, Protective clothing — Protection against heat and fire — Method of test: Evaluation of materials
and material assemblies when exposed to a source of radiant heat
ISO 8559-1:2017, Size designation of clothes — Part 1: Anthropometric definitions for body measurement
ISO 9151, Protective clothing against heat and flame — D
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