EN ISO 17491-4:2024

SLOVENSKI STANDARD
01-november-2024
Nadomešča:
SIST EN ISO 17491-4:2008
SIST EN ISO 17491-4:2008/A1:2016
Varovalna obleka - Preskusne metode za obleke, ki varujejo pred kemikalijami - 4.
del: Ugotavljanje odpornosti materialov proti penetraciji z razprševanjem (spray
test) (ISO 17491-4:2024)
Protective clothing - Test methods for clothing providing protection against chemicals -
Part 4: Determination of resistance to penetration by a spray of liquid (spray test) (ISO
17491-4:2024)
Schutzkleidung - Prüfverfahren für Chemikalienschutzkleidung - Teil 4: Bestimmung der
Beständigkeit gegen das Durchdringen von Flüssigkeitsspray (Spray-Test) (ISO 17491-
4:2024)
Habillement de protection - Méthodes d’essai pour les vêtements fournissant une
protection contre les produits chimiques - Partie 4: Détermination de la résistance à la
pénétration par pulvérisation de liquide (essai au brouillard) (ISO 17491-4:2024)
Ta slovenski standard je istoveten z: EN ISO 17491-4:2024
ICS:
13.340.10 Varovalna obleka Protective clothing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 17491-4
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2024
EUROPÄISCHE NORM
ICS 13.340.10 Supersedes EN ISO 17491-4:2008, EN ISO 17491-
4:2008/A1:2016
English Version
Protective clothing - Test methods for clothing providing
protection against chemicals - Part 4: Determination of
resistance to penetration by a spray of liquid (spray test)
(ISO 17491-4:2024)
Habillement de protection - Méthodes d'essai pour les Schutzkleidung - Prüfverfahren für
vêtements fournissant une protection contre les Chemikalienschutzkleidung - Teil 4: Bestimmung der
produits chimiques - Partie 4: Détermination de la Beständigkeit gegen das Durchdringen von
résistance à la pénétration par pulvérisation de liquide Flüssigkeitsspray (Spray-Test) (ISO 17491-4:2024)
(essai au brouillard) (ISO 17491-4:2024)
This European Standard was approved by CEN on 4 June 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 17491-4:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 17491-4:2024) has been prepared by Technical Committee ISO/TC 94
"Personal safety - Personal protective equipment" in collaboration with Technical Committee CEN/TC
162 “Protective clothing including hand and arm protection and lifejackets” the secretariat of which is
held by DIN.
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 December 2024, and conflicting national standards
shall be withdrawn at the latest by December 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 17491-4:2008, EN ISO 17491-4:2008/A1:2016.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 17491-4:2024 has been approved by CEN as EN ISO 17491-4:2024 without any
modification.
International
Standard
ISO 17491-4
Second edition
Protective clothing — Test methods
2024-05
for clothing providing protection
against chemicals —
Part 4:
Determination of resistance to
penetration by a spray of liquid
(spray test)
Habillement de protection — Méthodes d’essai pour les vêtements
fournissant une protection contre les produits chimiques —
Partie 4: Détermination de la résistance à la pénétration par
pulvérisation de liquide (essai au brouillard)
Reference number
ISO 17491-4:2024(en) © ISO 2024

ISO 17491-4:2024(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 17491-4:2024(en)
Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle of test method . 2
5 Test liquid . 2
6 Apparatus and test subjects . 2
7 Preparation of the test subjects for the spray test . 5
8 Preparation of the spray application system . 5
8.1 Test liquid .5
8.2 Nozzle output .5
8.3 Distribution of the spray liquid and alignment of spray nozzles .6
9 Procedure . 7
9.1 Spray procedure .7
9.2 Procedure for penetration and stains .7
10 Test report . 8
Annex A (informative) The non-absorbent fabric and absorbent overall. 9
Annex B (informative) Body measurements and selection sizing of the test garment .10
Annex C (normative) Donning and doffing of test garment and marking of stain .12
Annex D (informative) Interlaboratory study (ILS) observations for ISO 17491-4 Methods A
and B. 14
Bibliography .18

iii
ISO 17491-4:2024(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 94, Personal safety — Personal protective
equipment, Subcommittee SC 13, Protective clothing, in collaboration with the European Committee for
Standardization, (CEN) Technical Committee CEN/TC 162, Protective clothing including hand and arm
protection and lifejackets, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 17491-4:2008), which has been technically
revised. It also incorporates the Amendment ISO 17491-4:2008/Amd.1:2016.
The main changes are as follows:
— specifications for test liquid have been revised/added;
— Clause 6 has been revised to provide more specificity. Specification have been changed and/or revised
for absorbent overall, calibrated stain, turntable, spray booth, spray boom, hydraulic nozzles in Clause 6
and other applicable clauses;
— details for the selection of the right overall size have been added in 6.10 as well as in Annex B;
— 8.3 has been revised and heading changed to “Distribution of the spray liquid and alignment of spray
nozzles.”;
— figure and additional information have been added in 9.1 to provide more specificity;
— inclusion of Annex A on absorbent fabric for the detector suit and non-absorbent fabric for the calibration
pattern;
— inclusion of Annex B on test subject size measurement and right overall size fitting;
— inclusion of Annex C on right donning and doffing, as well as stain area measurement;
— inclusion of Annex D with the ILT results.
A list of all parts in the ISO 17491 series can be found on the ISO website.

iv
ISO 17491-4:2024(en)
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.

v
ISO 17491-4:2024(en)
Introduction
This document describes a test method for determining the spray penetration resistance of chemical
protective clothing Type 4 (with spray-tight connections between different parts of the clothing and, if
applicable, between the clothing and other items of personal protective equipment) and Type 6 (limited
performance protective clothing).
Such clothing comprises one or more items covering the full surface of the body and is intended to be worn
under conditions where there is a risk of exposure to a spray of a liquid chemical. Other requirements
with regard to this type of clothing and its constituent materials can be found in the respective product
[1]
standards .
Interlaboratory testing has shown that this test method is a repeatable pass/fail method.
[2]
A document on the selection, use and maintenance of chemical protective clothing is available .

vi
International Standard ISO 17491-4:2024(en)
Protective clothing — Test methods for clothing providing
protection against chemicals —
Part 4:
Determination of resistance to penetration by a spray of
liquid (spray test)
CAUTION — Some of the procedures specified in this document involve the use of processes which
could lead to hazardous situations and hence appropriate precautions should be taken.
1 Scope
This document specifies the test method for determining the resistance of chemical protective clothing to
penetration by sprays of liquid chemicals at two different levels of intensity:
a) Method A: low-level spray test. This is applicable to clothing that covers the full body surface and is
intended to be worn when there is a potential risk of exposure to small quantities of spray or accidental
low-volume splashes of a liquid chemical.
b) Method B: high-level spray test. This is applicable to clothing with spray-tight connections between
different parts of the clothing and, if applicable, between the clothing and other items of personal
protective equipment, which covers the full body surface and which is intended to be worn when there
is a risk of exposure to sprayed liquid chemical.
This document does not apply to chemical permeation resistance of the materials from which the chemical
protective clothing is made.
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 11610, Protective clothing — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 11610 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
absorbent overall
overall made from an absorbent material, worn under the test suit and intended for collecting liquid
penetration during spray and jet testing of chemical protective clothing

ISO 17491-4:2024(en)
3.2
calibrated stain
visible stain, with a defined minimum area, generated by dropping a specified quantity of test liquid on to an
absorbent overall (3.1)
Note 1 to entry: The calibrated stain is used to measure liquid penetration during spray and jet testing of chemical
protective clothing.
4 Principle of test method
An aqueous spray, containing a visible dye tracer, is directed under controlled conditions at the chemical
protective clothing worn by a human test subject. Inspection of the inside surface of the clothing and the
outside surface of the absorbent overall worn under the test garment allows any points of inward leakage to
be identified.
An interlab was performed and the results and conclusion can be found in Annex D.
5 Test liquid
To prepare the test chemical add methyl blue dye and dye stabilizer prior to adding the surfactant to water.
The temperature of the test liquid shall be between 20 °C and 30 °C.
For methods A and B, the concentration of the methyl blue dye (CAS number 28983-56-4) shall be
(0,2 ± 0,02) g/l. The dye stabilizer shall be analytical grade citric acid (CAS number 77-92-9) with a
concentration of (2,45 ± 0,05) g/l.
The surfactant is then added to achieve the required surface tension. Mixtures such as dish washing
detergent that include other ingredients are not considered surfactants and shall not be used.
−3
a) For method A: a surface tension of (52,0 ± 7,5) × 10 N/m;
−3
b) For method B: a surface tension of (30,0 ± 5,0) × 10 N/m.
1)
NOTE 1 Surfactants: Genapol LRO liquid [sodium lauryl ether sulfate (CAS number [009004-82-4])] that can be
used to achieve the required surface tension at the concentration of 0,03 ml/l for method A and 0,5 ml/l for method B.
This information is given for the convenience of users of this document and does not constitute an endorsement by ISO
of the products named. Equivalent products can be used if they can be shown to lead to the same results.
NOTE 2 To measure the surface tension within the stated tolerance, any suitable method can be used, e.g. a wright
torsion balance using a standard 12 mm diameter platinum ring.
It shall be ensured that the surface tension and temperature of the test liquid are stable throughout the test,
i.e., the surface tension of the liquid leaving the nozzle as well as the tension of the liquid in the tank shall
meet the requirements. This shall be verified before and after each day of test and shall meet all the above
requirement in this clause according to either Method A or Method B.
The necessary measures shall be taken to protect the test subject and to avoid contamination of the surface
water drainage system.
6 Apparatus and test subjects
6.1 Absorbent overall.
The overall shall be a one-piece garment with a hood made with absorbent white or off-white fabric. It shall
not include elastic waistband/gathers at the waist as it affects contact between the test garment and the
absorbent overall. The absorbent overall shall be sufficiently homogeneous to produce absorption spots
which vary less than 10 % in surface area from the mean value for a given volume of liquid, when sampled
liquid is an example of a suitable product available commercially. This information is given for the convenience of users of this document
1)  Genapol LRO
and does not constitute an endorsement by ISO of this product.

ISO 17491-4:2024(en)
at any place on the garment. It shall be made from a water-absorbent material. See Annex A for absorbent
overall requirements.
6.2 Calibrated stain.
Calibrated stains shall be used as a reference for the pass/fail evaluation of the tested suit. Pass/fail criteria
[1]
shall be specified in the relevant product standard .
A calibration stain shall be produced only after a test where a leakage has been detected on the absorbent
overall.
Select an area of the absorbent overall where no leakage has been detected right after the doffing of the
garment. Put under it a piece of undergarment and ensure that both layers are in contact. Put the assembly
under a dispenser, with the lower tip of the dispenser at a vertical distance of (5,0 ± 0,5) cm above the
assembly. Dispense a volume of (25 ± 5) µl of the test liquid to produce a clearly visible stain on the surface
of the overall. After 5 min (±15 s), define the outline of the stain before it is measured. Several methods can
be used to measure the calibration stain, such as a planimeter. The minimum area of the stain shall be 1 cm
after 5 min (±15 s).
6.3 Turntable.
A waterproof platform capable of supporting a test subject and rotating at (1,0 ± 0,1) full circle per minute.
The diameter of the turntable shall be 60 cm or more.
6.4 Test liquid container.
The test liquid shall be prepared and stored in a container.
6.5 Hydraulic pump.
A self-priming, recirculating-type pump shall be used. The pump shall be equipped with a pressure gauge
and adjustment, a variable output control filter and hoses to convey the test liquid from the test liquid
container to the spray boom. A four-way distribution tube shall be connected to the pump outlet, with each
of the four outlets connected directly to a nozzle.
The pump shall be capable of supplying a minimum pressure of 400 kPa.
Provisions shall be taken to avoid the test starting before the pressure is completely built up.
6.6 Stopwatch.
A stopwatch accurate to 1 s shall be used.
6.7 Spray booth.
The size of the spray booth shall be at least 2,14 m (H) × 1,2 m (W) × 2 m (D), but it shall not exceed 3 m
(H) × 3 m (W) × 3,5 m (D).
6.8 Spray boom.
A vertical rod or frame to which four nozzles can be attached (45,0 ± 0,5) cm apart from each other starting
from the top of the turntable (see Figure 1). In Figure 1, the turntable surface is at the same level as the floor.
For cabins with turntable above the floor, the lowest nozzle shall be (60,0 ± 0,5) cm from the surface of the
turntable and not from the cabin floor.

ISO 17491-4:2024(en)
Dimensions in centimetre
Key
1 turntable
2 top of turn table (cabin floor may be even with or lower than turn table)
Figure 1 — Apparatus for determining the resistance to spray
6.9 Hydraulic nozzles.
2)
Hydraulic nozzles shall be of the hollow cone type, each nozzle supplying liquid at a rate of:
— (0,47 ± 0,05) l/min at a 300 kPa pressure for method A.
— (1,14 ± 0,10) l/min at a 300 kPa pressure for method B.
Each nozzle shall be equipped with an individual pressure gauge and pressure control valve in order to
obtain the same pressure at each nozzle.
Nozzles are subject to deterioration with use. A flowrate verification procedure is recommended to check if
they a
...