prEN ISO 11612
(Main)Protective clothing - Clothing to protect against heat and flame - Minimum performance requirements (ISO/DIS 11612:2024)
Protective clothing - Clothing to protect against heat and flame - Minimum performance requirements (ISO/DIS 11612:2024)
ISO 11612:2015 specifies performance requirements for protective clothing made from flexible materials, which are designed to protect the wearer's body, except the hands, from heat and/or flame. For protection of the wearer's head and feet, the only items of protective clothing falling within the scope of ISO 11612:2015 are gaiters, hoods, and overboots. However, concerning hoods, requirements for visors and respiratory equipment are not given.
The performance requirements set out in ISO 11612:2015 are applicable to protective clothing which could be worn for a wide range of end uses, where there is a need for clothing with limited flame spread properties and where the user can be exposed to radiant or convective or contact heat or to molten metal splashes.
Schutzkleidung - Kleidung zum Schutz gegen Hitze und Flammen - Mindestleistungsanforderungen (ISO/DIS 11612:2024)
Dieses Dokument legt die Leistungsanforderungen an Schutzkleidung fest, die aus flexiblen Materialien besteht und zum Schutz des Körpers des Trägers, mit Ausnahme der Hände, gegen Hitze und/oder Flammen vorgesehen ist. Die einzigen Teile von Schutzkleidung zum Schutz von Kopf und Füßen des Trägers, die in den Anwendungsbereich dieses Dokuments fallen, sind Gamaschen, Hauben und Überschuhe. Für Hauben werden jedoch keine Anforderungen an Sichtscheiben und Atemgeräte angegeben.
Die in diesem Dokument angegebenen Leistungsanforderungen sind anwendbar für Schutzkleidung, die bei zahlreichen Endanwendungen getragen werden könnte, bei denen Kleidung mit begrenzter Flammenausbreitung erforderlich ist und bei denen der Träger Strahlungswärme, konvektiver Wärme oder Kontaktwärme oder Spritzern geschmolzenen Metalls ausgesetzt sein kann.
Dieses Dokument ist nicht anwendbar für Schutzkleidung, die in anderen Internationalen Normen festgelegt ist (siehe Einleitung).
Vêtements de protection - Vêtements de protection contre la chaleur et les flammes - Exigences de performance minimales (ISO/DIS 11612:2024)
L'ISO 11612:2015 spécifie les exigences de performance relatives aux vêtements de protection fabriqués avec des matériaux souples, conçus pour protéger le corps de l'utilisateur, sauf les mains, contre la chaleur et/ou les flammes. Pour la protection de la tête et des pieds, les seuls articles d'habillement de protection relevant du domaine d'application de l'ISO 11612:2015 sont les guêtres, les cagoules et les couvre-chaussures. Toutefois, en ce qui concerne les cagoules, aucune exigence n'est donnée pour les visières et les appareils respiratoires.
Les exigences de performance fournies dans l'ISO 11612:2015 sont applicables aux vêtements de protection qui pourraient être portés pour un large éventail d'utilisations finales, où il existe un besoin de vêtements offrant des propriétés de propagation de flamme limitée et où le porteur peut être exposé à une chaleur émise par rayonnement, par convection ou par contact ou à des projections/éclaboussures de métal en fusion.
Varovalna obleka - Obleka za varovanje pred toploto in plamenom - Minimalne zahtevane lastnosti (ISO/DIS 11612:2023)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-november-2023
Varovalna obleka - Obleka za varovanje pred toploto in plamenom - Minimalne
zahtevane lastnosti (ISO/DIS 11612:2023)
Protective clothing - Clothing to protect against heat and flame - Minimum performance
requirements (ISO/DIS 11612:2023)
Schutzkleidung - Kleidung zum Schutz gegen Hitze und Flammen -
Mindestleistungsanforderungen (ISO/DIS 11612:2023)
Vêtements de protection - Vêtements de protection contre la chaleur et les flammes -
Exigences de performance minimales (ISO/DIS 11612:2023)
Ta slovenski standard je istoveten z: prEN ISO 11612
ICS:
13.340.10 Varovalna obleka Protective clothing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11612
ISO/TC 94/SC 13 Secretariat: SNV
Voting begins on: Voting terminates on:
2023-08-21 2023-11-13
Protective clothing - Clothing to protect against heat and
flame - Minimum performance requirements
ICS: 13.340.10
This document is circulated as received from the committee secretariat.
THIS DOCUMENT IS A DRAFT CIRCULATED
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ISO/DIS 11612:2023(E)
DRAFT INTERNATIONAL STANDARD
ISO/DIS 11612
ISO/TC 94/SC 13 Secretariat: SNV
Voting begins on: Voting terminates on:
Protective clothing - Clothing to protect against heat and
flame - Minimum performance requirements
ICS: 13.340.10
This document is circulated as received from the committee secretariat.
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ii
PROVIDE SUPPORTING DOCUMENTATION. © ISO 2023
ISO/DIS 11612:2023(E)
Contents Page
Foreword .v
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 General and design requirements . .5
4.1 General . 5
4.2 Size designation and fit . 5
4.2.1 General . 5
4.2.2 Protective clothing . 5
4.2.3 Additional protective garments . 5
4.3 Pockets and closures . 6
4.4 Hardware . . 6
4.5 Additional design requirements for molten splash protective garments. 6
5 Sampling and pre-treatment . .7
5.1 Sampling . 7
5.2 Pre-treatment . 7
5.2.1 Pre-treatment by cleaning . 7
5.2.2 Mechanical pre-treatment . 7
5.3 Ageing . 7
5.4 Conditioning. 7
6 General performance requirements . 8
6.1 General . 8
6.2 Heat resistance . 8
6.2.1 Heat resistance at a temperature of (180 ± 5) °C . 8
6.2.2 Optional requirement — Heat resistance at a temperature of (260 ± 5) °C . 8
6.3 Limited flame spread . 8
6.3.1 General . 8
6.3.2 Testing in accordance with ISO 15025:2016, Procedure A (code letter A1) . 9
6.3.3 Testing in accordance with ISO 15025:2016, Procedure B (code letter A2). 10
6.4 Dimensional change of textile materials . 10
6.5 Physical requirements . 11
6.5.1 Tensile strength . 11
6.5.2 Tear strength . 11
6.5.3 Burst strength for knitted materials and seams . 11
6.5.4 Seam strength . 11
6.6 Fat content of leather . 11
7 Heat transmission performance requirements .11
7.1 General . 11
7.2 Convective heat (code letter B) .12
7.3 Radiant heat (code letter C) .12
7.4 Molten aluminium splash (code letter D) .12
7.5 Molten iron splash (code letter E) . 13
7.6 Contact heat (code letter F) .13
8 Summary of flame and heat transmission tests and corresponding letter codes
(see Table 8) .14
9 Marking . .14
10 Information supplied by the manufacturer .15
Annex A (normative) Mechanical pre-treatment for metallized materials.16
iii
ISO/DIS 11612:2023(E)
Annex B (normative) Determination of property values for rating and classification .18
Annex C (informative) Guidelines for clothing design .19
Annex D (informative) Risk assessment .20
Annex E (normative) Uncertainty of measurement .21
Annex F (informative) Smart Garments .23
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Regulation (EU) 2016/425 aimed to be covered .24
Bibliography .27
iv
ISO/DIS 11612:2023(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 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 - Personal protective
equipment, Subcommittee SC 13, Protective clothing.
This fourth edition cancels and replaces the third edition (ISO 11612:2015), which has been technically
revised.
The main changes are as follows:
— Issue dates added to normative references;
— Removed reference to EN 15614, Protective clothing for firefighters — Laboratory test methods and
performance requirements for wildland clothing;
— Additional design requirements for molten splash protective garments; zipper guidance added;
— Correction made to burst strength in clause 6.5.3. related to 7.3cm test area. Corrected from
2 2
200kPa to 260kPa based on Pascal's law; a diameter of 50cm is 7.98cm, and a diameter of 7.3cm is
3.05cm. The ratio of the diameter is 2.61;
— Guidance on minimum number of test samples added for test methods without specified
requirements;
— Heat transmission performance, Radiant Heat; Performance level C1 references Round Robin
6942:2022; Annex A;
— Optional test – Whole garment test against fire exposure on thermal manikin removed;
— EN IEC 61482-2: 2020, Protective clothing against the thermal hazards of an electric arc referenced in
introduction;
— Graphical symbol for single use added;
— Sustainability statement added to Annex C;
v
ISO/DIS 11612:2023(E)
— Annex E provides extended guidance on uncertainty of measurement;
— Informative Annex F relating to Smart Garments added;
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.
vi
ISO/DIS 11612:2023(E)
Introduction
The purpose of this document is to provide minimum performance requirements for clothing to protect
against heat and flame, which could be worn for a wide range of end uses. All the other standards
listed in this Introduction deal also with clothing to protect against heat and flame, but rather for quite
specific products or end uses.
Within many of the hazards listed in this document there are three performance levels:
— Level 1 to indicate exposure to low risk;
— Level 2 to indicate exposure to medium risk;
— Level 3 to indicate exposure to high risk.
For protection against extreme exposures to radiant heat, there is a fourth performance level to
take into account, high performance materials such as aluminized and similar materials. The level of
personal protection to be provided is based on the outcome of the risk assessment and some comments
on risk assessment are given in Annex D.
For complete protection against exposure to heat and/or flame, it is probable that it will be necessary
to protect the head, face, hands, and/or feet with suitable Personal Protective Equipment (PPE) and in
some cases, appropriate respiratory protection might also be considered necessary.
[1]
Attention is drawn to ISO/TR 2801:2007 , which sets out guidelines for selection, use, care, and
maintenance of protective clothing against heat and flame and with respect to industrial garments
CEN 14560:2018 may also be a relevant source of guidance.
Nothing in this document is intended to restrict any jurisdiction, purchaser, or manufacturer from
exceeding these minimum requirements. It is one of several standards for clothing that have been
developed to protect persons against heat and/or flames. Other standards include:
— ISO FDIS 11611:2022, Protective clothing for use in welding and allied processes;
— ISO 11613:2017, Protective clothing for firefighters — Laboratory test methods and performance
requirements;
— ISO 14460:1999, Protective clothing for automobile racing drivers — Protection against heat and
flame — Performance requirements and test methods;
— ISO 15384:2018+Amd 1:2021, Protective clothing for firefighters — Laboratory test methods and
performance requirements for wildland firefighting clothing;
— ISO 15538:2001, Protective clothing for firefighters — Laboratory test methods and performance
requirements for protective clothing with a reflective outer surface;
— EN IEC 61482-2: 2020, Protective clothing against the thermal hazards of an electric arc;
— EN 469:2020, Protective clothing for firefighters — Performance requirements for protective clothing
for firefighting;
— EN 1486:2007, Protective clothing for fire-fighters — Test methods and requirements for reflective
clothing for specialized fire fighting;
— EN 13911:2017, Protective clothing for firefighters — Requirements and test methods for fire hoods for
firefighters;
— ISO 11999-3:2015, 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.
vii
DRAFT INTERNATIONAL STANDARD ISO/DIS 11612:2023(E)
Protective clothing - Clothing to protect against heat and
flame - Minimum performance requirements
1 Scope
This document specifies performance requirements for protective clothing made from flexible
materials, which are designed to protect the wearer’s body, except the hands, from heat and/or flame.
For protection of the wearer’s head and feet, the only items of protective clothing falling within the
scope of this document are gaiters, hoods, and over boots. However, concerning hoods, requirements
for visors and respiratory equipment are not given.
The performance requirements set out in this document are applicable to protective clothing which
could be worn for a wide range of end uses, where there is a need for clothing with limited flame spread
properties and where the user can be exposed to radiant or convective or contact heat or to molten
metal splashes.
This document is not applicable to protective clothing that is specified by other International Standards
(see Introduction).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. Only the edition cited applies.
ISO 3376:2020, Leather — Physical and mechanical tests — Determination of tensile strength and
percentage elongation
ISO 3377-1:2011, Leather — Physical and mechanical tests — Determination of tear load — Part 1: Single
edge tear
ISO 4048:2018, Leather — Chemical tests — Determination of matter soluble in dichloromethane and free
fatty acid content
ISO 5077:2007, Textiles — Determination of dimensional change in washing and drying
ISO 5725-2:2019, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic
method for the determination of repeatability and reproducibility of a standard measurement method
ISO 6530:2005, Protective clothing — Protection against liquid chemicals — Test method for resistance of
materials to penetration by liquids
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 9151:2016, Protective clothing against heat and flame — Determination of heat transmission on
exposure to flame
ISO 9185:2007, Protective clothing — Assessment of resistance of materials to molten metal splash
ISO/FDIS 11611:2022, Protective clothing for use in welding and allied processes
ISO 12127-1:2015, Clothing for protection against heat and flame — Determination of contact heat
transmission through protective clothing or constituent materials — Part 1: Contact heat produced by
heating cylinder
ISO/DIS 11612:2023(E)
E N 1303 4:20 05+A 1: 20 0 9, Protective clothing against liquid chemicals. Performance requirements for
chemical protective clothing offering limited protective performance against liquid chemicals
ISO 13688:2013, Protective clothing — General requirements
ISO 13688:2013/AMD 1:2021, Protective clothing — General requirements — Amendment 1
ISO 13934-1:2013, Textiles — Tensile properties of fabrics — Part 1: Determination of maximum force and
elongation at maximum force using the strip method
ISO 13935-2:2014, Textiles — Seam tensile properties of fabrics and made-up textile articles — Part 2:
Determination of maximum force to seam rupture using the grab method
ISO 13937-2:2000, Textiles — Tear properties of fabrics — Part 2: Determination of tear force of trouser-
shaped test specimens (Single tear method)
ISO 13938-1:2019, Textiles — Bursting properties of fabrics — Part 1: Hydraulic method for determination
of bursting strength and bursting distension
ISO 13938-2:2019, Textiles — Bursting properties of fabrics — Part 2: Pneumatic method for determination
of bursting strength and bursting distension
ISO 15025:2016, Protective clothing — Protection against flame — Method of test for limited flame spread
ISO 16602:2007, Protective clothing for protection against chemicals — Classification, labelling and
performance requirements
ISO 17493:2016, Clothing and equipment for protection against heat — Test method for convective heat
resistance using a hot air circulating oven
ISO 23407:2021, Protective gloves against thermal risks (heat and/or fire)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO/FDIS 11610:2023 and the
following apply.
ISO and IEC maintain terminology 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
ageing
changing of the product performance over time during use or storage
Note 1 to entry: Ageing is caused by a combination of several factors, such as:
— cleaning, maintenance, or disinfecting processes;
— exposure to visible and/or ultraviolet radiation;
— exposure to high or low temperatures or to changing temperatures;
— exposure to chemicals including humidity;
— exposure to biological agents such as bacteria, fungi, insects, or other pests;
— exposure to mechanical action such as abrasion, flexing, pressure, and strain;
— exposure to contaminants such as dirt, oil, splashes of molten metal, etc.;
— exposure to wear and tear.
ISO/DIS 11612:2023(E)
3.2
cleaning
process by which a PPE is made again serviceable and/or hygienically wearable by removing any dirt or
contamination
Note 1 to entry: A cleaning cycle is typically a washing plus drying or a dry cleaning treatment followed, if
required, by ironing or finishing.
3.3
clothing assembly
series of garments arranged in the order as worn
Note 1 to entry: They may contain multilayer materials, material combinations, or a series of separate garments
in single layers.
3.4
component
any material, part, or sub-assembly used in the construction of an item of PPE
3.5
component assembly
combination of all materials and hardware presented exactly as the finished garment construction
3.6
conditioning
keeping samples under standard conditions of temperature and relative humidity for a minimum
period of time
3.7
gaiter
removable covering intended to protect the part of the leg below the knee which can also cover the
upper surface of shoes
3.8
hardware
non-fabric items forming part of or optional extras in a garment
EXAMPLE Metal or plastic buttons or zippers and touch and close fasteners or hook and loop fasteners.
3.9
hole
any opening, break, or discontinuity of any size in the original structure of the test specimen’s fabric
caused by application of the test flame
3.10
hood
item of PPE made from flexible material, which covers the head and neck and may also cover the
shoulders
3.11
innermost lining
innermost face of a component assembly closest to the wearer’s skin
Note 1 to entry: Where the innermost lining forms part of a material combination, the material combination is
regarded as the innermost lining.
3.12
interlining
layer between the outermost layer and the innermost lining in a multilayer garment
ISO/DIS 11612:2023(E)
3.13
material
substances, excluding hardware, of which an item of clothing is made
3.14
material assembly
combination of all materials of a multi-layer garment presented exactly as the finished garment
construction
3.15
material combination
material produced from a series of separate layers, fixed together during the garment manufacturing
stage
3.16
multilayer material
material consisting of different layers intimately combined prior to the garment manufacturing stage
EXAMPLE The combining process includes weaving, quilting, coating and gluing.
3.17
outer material
outermost material of which the item of clothing is made
3.18
overboots
single or multiple layers of material covering the footwear to provide protection to the feet and ankles
of the wearer against heat and/or flame
Note 1 to entry: Certain types of overboot used for this purpose can also cover parts of the legs and/or ankles.
3.19
patch pocket
pocket located on the exterior of a protective garment, which is stitched as a patch over the outer layer
of the protective garment
3.20
pre-treatment
standard way of preparing the samples before testing
Note 1 to entry: This might include a number of cleaning cycles, submitting the sample to heat, mechanical action,
or any other relevant exposure and is completed by conditioning.
3.21
protective garment
individual item of protective clothing, which provides protection against specified hazards to the part
of the body that it covers
EXAMPLE Protective coat, apron, trousers, gaiters, hoods, boiler suit or coverall.
3.22
protective clothing
clothing which covers or replaces personal clothing and which is designed to provide protection for the
wearer’s upper and lower torso, neck, arms, and legs
3.23
seam
any method of permanent fastening between two or more pieces of material
3.23.1
overlapping seam
seam where all or part of one or more layers of material covers the other layer or layers causing a ridge
ISO/DIS 11612:2023(E)
3.23.2
side seam
seam that runs laterally along the garment when it is placed flat on a surface, with the front uppermost
3.23.3
structural seam
seam that is necessary for the integrity of the garment
4 General and design requirements
4.1 General
General requirements which are not specifically covered in this document shall be in accordance with
ISO 13688:2013/AMD 1:2021.
For protection of the hands ISO 23407:2021 should be consulted.
For accepted protective clothing vocabulary ISO/FDIS 11610:2023 should be consulted.
4.2 Size designation and fit
4.2.1 General
Garment sizes shall be in accordance with the requirements of ISO 13688:2013/AMD 1:2021.
Consider vocabulary guidance in ISO 8559-1:2017.
4.2.2 Protective clothing
Heat and flame protective suits shall completely cover the upper and lower torso, neck point, arms to
the wrist, and legs to the ankle. Suits shall consist of the following:
— a single garment, e.g. a coverall or boiler suit;
— a two-piece garment, consisting of a jacket and a pair of trousers;
— Trouser, boiler suit, coverall, bottoms shall overlap the top of the footwear and this overlap should
be maintained while walking and crawling;
— quick-release fastenings shall be provided to enable rapid removal of the garments in the event of
an emergency. Quick release fastenings include quick release zippers, press fasteners, hook and loop
fasteners and some buttons. Hardware should enable quick release of the garment in the event of an
emergency.
Where protection to the requirements of this document is provided by an outer two-piece suit, it shall
be determined that, when correctly sized for the wearer, an overlap between the jacket and trousers
remains when one standing wearer firstly fully extends both arms above the head and then bends over
until the fingertips touch the ground.
Conformity shall be checked by visual inspection including an assessment of fit and physical measuring
when the appropriate size of clothing is donned by a wearer.
In addition, the wrists, lower arms, and ankles shall also remain covered in an upright position and
with arms hanging down; this shall also apply to one-piece suits.
4.2.3 Additional protective garments
Heat and flame protective garments other than suits in accordance with 4.2.2 may be designed to
provide protection for specific parts of the body, e.g. neck curtain, hoods, sleeves, apron, and gaiters.
ISO/DIS 11612:2023(E)
They shall be worn in addition to a suit in accordance with 4.2.2 and the additional item alone shall also
meet the requirements of this document.
Performance testing of additional protective garments shall be carried out on the assembly, comprising
the suit plus the additional protective garment. Additional protective garments such as hoods, sleeves,
apron, and gaiters shall cover the intended areas when worn with a suit of appropriate size and the
additional item alone shall also meet the requirements of this document.
4.3 Pockets and closures
Where garments are constructed with pockets, the pockets and pocket bags shall be made of material(s)
conforming to 6.2 and 6.3.
All openings in garments shall be designed in such a way to prevent entry of heat, flame, or hot material.
Front openings should be capable of being closed over the entire length by appropriate overlapping. An
exception to this guidance is made in the case of a single ruler pockets on one or both legs and radio
pockets whose openings do not exceed 75mm. These pockets are permitted without a closure and thus
allow consistency with ISO FDIS 11611:2022.
4.4 Hardware
Hardware penetrating the outer material of a heat and flame protective garment or garment assembly
shall not be exposed to the innermost surface of the garment or the garment assembly.
Conformity shall be checked by visual inspection.
4.5 Additional design requirements for molten splash protective garments
Garments that are designed to protect against the risk of exposure to molten metal splash by meeting
the performance requirements designated by code letters D and E, shall have the following additional
design features.
a) The sleeves including cuffs of jackets and coveralls and the lower leg regions of trousers, coveralls
and bib and brace shall not have turn-ups.
b) External pockets on jackets, trousers, coveralls, and bib and brace, other than side pockets below
the waist which do not extend more than 10° forward of the side seam, shall be covered by flaps at
least 20 mm wider than the opening of the pocket (at least 10 mm on each side) in order to prevent
the flap from being tucked into the pocket.
c) Patch pockets shall be made from materials meeting the same protection indices (chosen from A to
F) and the same levels for these indices as the rest of the garment.
d) Overlapping seams on the outside of the garment shall be downward facing and secured in this
position.
e) Closures shall be designed with a protective cover flap on the outside of the garment. The
maximum distance between buttonholes/press studs shall be 150 mm. If zippers are used, the
slide fastener shall be designed in such a way that they completely close the opening and the slide
fastener shall lock when completely closed. Cuffs may be provided with closures to reduce their
width. The closure and any fold which it creates shall be on the underside of the cuff. The garment
is to be measured flat on a surface to determine the underside. Neck openings shall be provided
with closures. Trousers may have side slits which shall have a means of closure and the slit and
closure shall be covered. The closure and any fold which it creates shall point downwards when the
garment is worn.
f) Pleats in the exterior surface of the garment can act as trapping points for hot/molten materials.
If pleats are present in the garment, the bottoms of the pleats shall incorporate a means whereby
entrapment of molten metal can be prevented, for example by incorporating diagonal stitches or
some other feature.
ISO/DIS 11612:2023(E)
Conformity to a), d), and f) shall be checked by visual inspection and b) and e) by visual inspection and
physical measurement.
NOTE Further guidance on design of clothing to protect against these risks is given in Annex C.
5 Sampling and pre-treatment
5.1 Sampling
The number of samples and the size of the specimens of garment materials or garments presented to
the different test methods, shall be in accordance with the respective test standards specified in the
requirements Clauses 6 and 7. Samples for testing shall be taken from the original garment or shall be
representative of the component assembly or manufactured garment.
5.2 Pre-treatment
5.2.1 Pre-treatment by cleaning
Before each test specified in Clauses 6 and 7, except 6.6, the test materials and test specimens shall
be pre-treated by cleaning. If the manufacturer’s instructions indicate that cleaning is not allowed, i.e.
single-use garments, then testing shall be carried out on new material. In addition, 6.3 requires that
the limited flame spread tests shall be carried out both before the pre-treatment and after the pre-
treatment, if cleaning is allowed.
The cleaning shall be in line with the manufacturer’s instructions, on the basis of standardized
processes. If the number of cleaning cycles is not specified, the tests shall be carried out after five
cleaning cycles (a cleaning cycle is one wash and one dry cycle). This shall be reflected in the information
supplied by the manufacturer. If the garment can be washed and dry-cleaned, it shall only be washed. If
only dry-cleaning is allowed, the garment shall be dry-cleaned in accordance with the manufacturer's
instructions.
Leather materials shall be tested in the new state, except if the manufacturer indicates that cleaning is
allowed. In that case, cleaning shall be carried out according to the manufacturer's instructions.
The test specified in 6.6 shall be carried out in the new state (as received).
NOTE Manufacturer’s instructions typically indicate one or several of the various methods and processes of
[2] [3] [5]
ISO 6330:2021 , ISO 15797:2017 , ISO 3175-2:2017 , or equivalent as standardized processes for cleaning.
5.2.2 Mechanical pre-treatment
Metallized materials shall be pre-treated in accordance with Annex A before being submitted to radiant
heat testing (see 7.3).
5.3 Ageing
In the case that the garment should be submitted to some treatment to maintain its limited flame
spread property as specified in 6.3, the manufacturer shall indicate in the manufacturers instructions
the maximum number of cleaning cycles that can be carried out before applying the treatment indicated
to maintain the garment protective performance. Limited flame spread test according to 6.3 shall be
carried out after the last cleaning cycles before any treatment as indicated by the manufacturer; in both
cases the garment shall comply with the requirement.
5.4 Conditioning
Specimens other than leather shall be conditioned for at least 24 h in an atmosphere having a
temperature of (20 ± 2) °C and a relative humidity of (65 ± 5) %. Leather specimens shall be conditioned
ISO/DIS 11612:2023(E)
for at least 48 h in an atmosphere having a temperature of (20 ± 2) °C and a relative humidity of
(65 ± 5) %. Testing shall be carried out within 5 min of removal from this atmosphere.
6 General performance requirements
6.1 General
Protective garments that comply with this document shall meet the requirements of Clause 6, with the
exception of the requirements of 6.2.2 which is optional and 6.6 only if applicable, and shall meet at
least one of the heat transmission requirements for letter codes B, C, D, E or F of Clause 7 based on their
intended use. Such garments shall be marked in accordance with Clause 8.
Wherever in Clauses 6 and 7, the requirements for a property value are expressed in terms of a
minimum or maximum value, and wherever a minimum or maximum value is to determine a Level or
Class for that property, the resultant property value shall be determined according to Annex B. All tests
results in Clauses 6 and 7 shall be evaluated in accordance with Annex E.
6.2 Heat resistance
6.2.1 Heat resistance at a temperature of (180 ± 5) °C
All materials and hardware, including retro-reflective materials used in the garment and/or clothing
assembly shall be tested according to ISO 17493:2016 at a temperature of (180 ± 5) °C for an exposure
time of 5 min. Materials can be either tested separately or as assembled in the garment and/or
component assembly. Test samples shall not ignite or melt, and fabrics and leather also not shrink by
more than 5 %. To verify shrinkage on multilayer samples, it might be necessary to close by sewing
around the edges of the test samples. At least 5 min after completion of the test, it shall be verified that
the closure system can be opened at least once.
6.2.2 Optional requirement — Heat resistance at a temperature of (260 ± 5) °C
The material of a single layer garment or of the innermost lining of a multilayer garment, which
is intended to be worn next to the skin, can be optionally tested according to ISO 17493:2016 at a
temperature of (260 ± 5) °C for an exposure time of 5 min. The material shall not ignite or melt and
shall not shrink by more than 10 % in addition to meeting the requirements of 6.2.1.
NOTE Heat shrinkage has the potential to reduce the thermal protection level of the garment as it reduces
the insulating air pocket between the garment and the body. Therefore, heat shrinkage in heat and flame
protective garments has to be limited, especially in cases where a heat or flame hazard exists that could hit a
large percentage area of the garment.
6.3 Limited flame spread
6.3.1 General
Testing of materials and seams shall take place in accordance with ISO 15025:2016, to Procedure A
(code letter A1), and optionally Procedure B (code letter A2). This test shall be carried out both before
and after the pre-treatment specified in 5.2.1.
ISO/DIS 11612:2023(E)
6.3.2 Testing in accordance with ISO 15025:2016, Procedure A (code letter A1)
6.3.2.1 When tested in accordance with ISO 15025:2016, Procedure A, specimens from single layer
garments shall meet the following requirements (see Table 1):
Table 1 — Limited flame spread performance requirements, ISO 15025:2016, Procedure A
(code letter A1)
Properties Requirement
Flame spread No specimen shall permit any part of the lowest boundary of any flame to reach the upper or
either vertical edge.
Flaming debris No specimen shall give flaming or molten debris.
Hole formation No specimen shall give hole formation of 5 mm or greater in any direction, except for an inter-
lining that is used for specific protection other than heat and flame protection.
Afterglow Afterglow time shall be ≤2 s.
A glowing inside the charred area is defined in ISO 15025:2016 as afterglow without combustion
and for the purpose of this clause is not regarded as afterglow.
Afterflame Afterflame time shall be ≤2 s.
For seams, three specimens containing a structural seam shall be tested in accordance with
ISO 15025:2016, Procedure A. Specimens shall be oriented with the seam running up the centreline of
the outer surf
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