SIST EN ISO 22568-4:2022

SLOVENSKI STANDARD
SIST EN ISO 22568-4:2022
01-marec-2022
Nadomešča:
SIST EN ISO 22568-4:2019
Ščitniki nog in stopal - Zahteve in preskusne metode za sestavne dele obutve - 4.
del: Nekovinski vložki, odporni proti prediranju (ISO 22568-4:2021)
Foot and leg protectors - Requirements and test methods for footwear components - Part
4: Non-metallic perforation resistant inserts (ISO 22568-4:2021)
Fuß- und Beinschutz - Anforderungen und Prüfverfahren für Schuhkomponenten - Teil 4:
Nichtmetallische Einlagen mit Widerstand gegen Durchstich (ISO 22568-4:2021)
Protecteurs du pied et de la jambe - Exigences et méthodes d'essais pour les
composants de chaussure - Partie 4: Inserts anti-perforation non métalliques (ISO 22568
-4 :2021)
Ta slovenski standard je istoveten z: EN ISO 22568-4:2021
ICS:
13.340.50 Varovanje nog in stopal Leg and foot protection
SIST EN ISO 22568-4:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 22568-4:2022

---------------------- Page: 2 ----------------------
SIST EN ISO 22568-4:2022


EN ISO 22568-4
EUROPEAN STANDARD

NORME EUROPÉENNE

December 2021
EUROPÄISCHE NORM
ICS 13.340.50 Supersedes EN ISO 22568-4:2019
English Version

Foot and leg protectors - Requirements and test methods
for footwear components - Part 4: Non-metallic
perforation resistant inserts (ISO 22568-4:2021)
Protecteurs du pied et de la jambe - Exigences et Fuß- und Beinschutz - Anforderungen und
méthodes d'essais pour les composants de chaussure - Prüfverfahren für Schuhkomponenten - Teil 4:
Partie 4: Inserts anti-perforation non métalliques (ISO Nichtmetallische Einlagen mit Widerstand gegen
22568-4 :2021) Durchstich (ISO 22568-4:2021)
This European Standard was approved by CEN on 12 October 2021.

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, Turkey 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 22568-4:2021 E
worldwide for CEN national Members.

---------------------- Page: 3 ----------------------
SIST EN ISO 22568-4:2022
EN ISO 22568-4:2021 (E)
Contents Page
European foreword . 3

2

---------------------- Page: 4 ----------------------
SIST EN ISO 22568-4:2022
EN ISO 22568-4:2021 (E)
European foreword
This document (EN ISO 22568-4:2021) has been prepared by Technical Committee ISO/TC 94
"Personal safety -- Personal protective equipment" in collaboration with Technical Committee CEN/TC
161 “Foot and leg protectors” 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 June 2022, and conflicting national standards shall be
withdrawn at the latest by June 2022.
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 22568-4:2019.
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 22568-4:2021 has been approved by CEN as EN ISO 22568-4:2021 without any
modification.

3

---------------------- Page: 5 ----------------------
SIST EN ISO 22568-4:2022

---------------------- Page: 6 ----------------------
SIST EN ISO 22568-4:2022
INTERNATIONAL ISO
STANDARD 22568-4
Second edition
2021-12
Foot and leg protectors —
Requirements and test methods for
footwear components —
Part 4:
Non-metallic perforation resistant
inserts
Protecteurs du pied et de la jambe — Exigences et méthodes d'essais
pour les composants de chaussure —
Partie 4: Inserts anti-perforation non métalliques
Reference number
ISO 22568-4:2021(E)
© ISO 2021

---------------------- Page: 7 ----------------------
SIST EN ISO 22568-4:2022
ISO 22568-4:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
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 2021 – All rights reserved

---------------------- Page: 8 ----------------------
SIST EN ISO 22568-4:2022
ISO 22568-4:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements for non-metallic perforation resistant inserts . 2
4.1 General . 2
4.2 Resistance to perforation. 2
4.3 Flexing resistance . 3
4.4 Stability against ageing and environmental influence . 3
4.5 Electrical resistance . 3
5 Test methods for the non-metallic perforation tests . 3
5.1 Determination of perforation resistance . 3
5.1.1 Method PL: with conical nail 4,5 mm diameter . 3
5.1.2 Method PS: with conical nail 3,0 mm diameter . 3
5.2 Determination of flexing resistance . 3
5.2.1 Apparatus . 3
5.2.2 Sampling . 4
5.2.3 Test procedure. 5
5.2.4 Results . 5
5.2.5 Test report . 5
5.3 Test methods for the assessment non-metallic perforation resistant inserts
in critical environment . 6
5.3.1 Sampling . 6
5.3.2 Effect of high temperature . 6
5.3.3 Effect of acid sweat . . 6
5.3.4 Effect of alkali sweat . 6
5.3.5 Effect of fuel oil . 6
5.3.6 Results . 6
5.3.7 Test report . 6
5.4 Determination of the electrical resistance . 7
5.4.1 Testing procedure . 7
5.4.2 Test report . 7
6 Marking . . 8
Annex A (normative) Method PL: perforation resistance with the conical nail 4,5 mm
diameter . 9
Annex B (normative) Method PS: Perforation resistance with the conical nail 3,0 mm
diameter .13
Bibliography .18
iii
© ISO 2021 – All rights reserved

---------------------- Page: 9 ----------------------
SIST EN ISO 22568-4:2022
ISO 22568-4:2021(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 3, Foot protection, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 161, Foot and leg protectors, in accordance with
the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 22568-4:2019), which has been
technically revised
The main changes are as follows:
— Table 2, changes in the type names from X and Y to PL and PS, new requirements (“tent effect” and
minimum value of 950 N);
— new nail, see Figure B.1 (conical shape instead of pyramidal);
— new definition in 3.2;
— Figure B.3 new dimension of the nail;
— Annex C and the reference material have been deleted.
A list of all parts in the ISO 22568 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
  © ISO 2021 – All rights reserved

---------------------- Page: 10 ----------------------
SIST EN ISO 22568-4:2022
ISO 22568-4:2021(E)
Introduction
ISO 20345, ISO 20346 and ISO 20347 are related to safety, protective and occupational footwear which
define the performance and required properties of the footwear. On introducing these standards all
national standards relating to perforation resistant inserts were withdrawn leaving the manufacturers
of these items with no means of demonstrating the performance of their products. This document has
been prepared to allow manufacturers to demonstrate the type of the perforation resistant inserts
before being inserted into the footwear.
Non-metallic perforation resistant inserts and materials complying with the requirements of this
document are suitable components of “PPE footwear”.
v
© ISO 2021 – All rights reserved

---------------------- Page: 11 ----------------------
SIST EN ISO 22568-4:2022

---------------------- Page: 12 ----------------------
SIST EN ISO 22568-4:2022
INTERNATIONAL STANDARD ISO 22568-4:2021(E)
Foot and leg protectors — Requirements and test methods
for footwear components —
Part 4:
Non-metallic perforation resistant inserts
1 Scope
This document specifies requirements and test methods for the non-metallic inserts with resistance
against mechanical perforation, intended to function as components of PPE footwear (e.g. as described
by ISO 20345, ISO 20346 and ISO 20347).
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 105-E04: 2013, Textiles — Tests for colour fastness — Part E04: Colour fastness to perspiration
ISO 20344, Personal protective equipment — Test methods for footwear
ISO 20345, Personal protective equipment — Safety footwear
ISO 20346, Personal protective equipment — Protective footwear
ISO 20347, Personal protective equipment — Occupational footwear
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 20345, ISO 20346 and
ISO 20347 and the following 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
non-metallic perforation resistant insert
non-metallic footwear component placed (or intended to be placed) in the sole complex or used as an
insole simultaneously in order to provide protection against perforation
3.2
“tent effect”
separation between the layers of the test piece during the testing procedure, some layers are perforated
other not giving, the aspect of the tent to the test piece
Note 1 to entry: The procedure is given in Annex A.
1
© ISO 2021 – All rights reserved

---------------------- Page: 13 ----------------------
SIST EN ISO 22568-4:2022
ISO 22568-4:2021(E)
4 Requirements for non-metallic perforation resistant inserts
4.1 General
Depending on the footwear construction, the non-metallic perforation resistant inserts could be in
contact with the wearer foot, therefore the requirements of ISO 20345, ISO 20346 and ISO 20347 should
be taken into account (for example abrasion resistance, water absorption, innocuousness).
Perforation resistant material can be tested in accordance with this document, even in an unshaped
status, if it is intended to be cut and/or shaped by the footwear or sole manufacturer. When shaped
non-metallic perforation resistant inserts are tested in accordance with this document, their suitability
to fit into footwear is not assured, because the dimensional conformity to the footwear depends on the
individual shape of each model of footwear.
Table 1 — Summary of requirements and number of samples
Property Subclause Number of samples Status
Non-metallic material: 1 sample
Resistance to
4.2 or mandatory
perforation
Ready –shaped inserts: 1 sample
Non-metallic material: 1 sample
Flexing resistance 4.3 or mandatory
Ready – shaped inserts: 2 different sizes
Stability against ageing Non-metallic material: 2 samples for each treatment
and environmental 4.4 or mandatory
influence Ready –shaped inserts: 2 samples for each treatment
Electrical resistance 4.5 Non-metallic material: 1 sample optional
NOTE For details, see 4.2 to 4.5.
For each of the required measurements performed in accordance with this standard, a corresponding
estimate of the uncertainty of measurement should be evaluated. One of the following approaches shall
be used:
[2]
— a statistical method, e.g. that given in ISO 5725-2 ;
[4]
— a mathematical method, e.g. that given in ISO/IEC Guide 98-3 ;
[5]
— uncertainty and conformity assessment as given in ISO/IEC Guide 98-4 ;
[6]
— JCGM 100 .
4.2 Resistance to perforation
When the non-metallic perforation resistant inserts are tested in accordance with the applicable
methods described in 5.1, they shall meet one of the two types given in Table 2.
2
  © ISO 2021 – All rights reserved

---------------------- Page: 14 ----------------------
SIST EN ISO 22568-4:2022
ISO 22568-4:2021(E)
Table 2 — Minimum requirements for the perforation force
Types Test method Requirements
Perforation test (see A.4); the four results reported shall be
“pass” with a force of 1100 N
Type PL See 5.1.1
No ”tent effect” shall occur
Perforation force (B.4)
Type PS See 5.1.2 the average value reported shall be greater or equal to 1100 N
No single value shall be lower than 950 N
NOTE This property has two types in term of the protection afforded. This covers the degree of risk or hazard that a
user will face in terms of the type of working places. Type PS offers more appropriate protection from smaller diameter and
sharper objects than type PL.
4.3 Flexing resistance
When tested in accordance with the method described in 5.2, the non-metallic perforation resistant
insert shall exhibit no visible signs of cracking, disintegration or delamination after having been
6
subjected to 1 × 10 (one million) flexion cycles.
4.4 Stability against ageing and environmental influence
When subjected to each single one of the 4 treatments described in 5.3 and tested in accordance
with the method described in 5.1, the non-metallic perforation resistant insert shall conform to the
requirements of 4.2.
4.5 Electrical resistance
This property is optional and frequently requested when the non-metallic perforation resistant inserts
are supposed to be used in a footwear with electrical properties (ISO 20345:2021, 6.2.2.1 and 6.2.2.2).
The results of this test, see 5.4, is given as an information, this document does not fix requirements.
5 Test methods for the non-metallic perforation tests
5.1 Determination of perforation resistance
5.1.1 Method PL: with conical nail 4,5 mm diameter
The test method described in Annex A shall be used.
5.1.2 Method PS: with conical nail 3,0 mm diameter
The test method described in Annex B shall be used.
5.2 Determination of flexing resistance
5.2.1 Apparatus
Flexing apparatus, comprising a suitable flexing guide (e.g. a pair of bars) to move the free end of the
non-metallic perforation resistant insert through a specified distance at a defined rate and a clamping
device consisting of two elastic interlayers approximately 4 mm thick and of Shore A hardness 75 ± 5
with two metal clamping plates at least 130 mm wide.
In the zero position, the guide acts at a distance of (70 ± 1) mm from the clamping plates (see Figure 1).
3
© ISO 2021 – All rights reserved

---------------------- Page: 15 ----------------------
SIST EN ISO 22568-4:2022
ISO 22568-4:2021(E)
Dimensions in millimetres
Key
1 flexing guide 3 elastic interlayer
2 clamping plates 4 test piece
Figure 1 — Example of details of a suitable construction of a flexing apparatus for non-metallic
perforation resistant inserts
5.2.2 Sampling
5.2.2.1 Number of test pieces
In case of ready-shaped non-metallic perforation resistant inserts, samples of two different sizes shall
be tested. For unshaped material cut out two suitable test pieces, giving them a shape similar to a
typical insole of approximate size 41 to 42 (Paris Point).
5.2.2.2 Determination of the flexing line
Lay the non-metallic perforation resistant insert with its inner edge against a straight base line in such
a way that this line is at a tangent to the insert in the joint and heel regions. At the tangent to the joint
construct a perpendicular. This line is the flexing line at which the insert is clamped (see Figure 2).
4
  © ISO 2021 – All rights reserved

---------------------- Page: 16 ----------------------
SIST EN ISO 22568-4:2022
ISO 22568-4:2021(E)
Dimensions in millimetres
Key
1 flexing line 3 flexing zone
2 base line 4 line of cut
Figure 2 — Flexing line for non-metallic perforation resistant inserts
5.2.2.3 Preparation of test piece
If necessary, cut off the heel part of the non-metallic perforation resistant insert at a distance of at least
90 mm from the flexing line (see Figure 2 and 5.2.2.2).
5.2.3 Test procedure
Deflect the test piece at a rate of (16 ± 1) Hz by moving the guide bar to a height of 33 mm, measured
vertically above the zero position. Ensure by means of a guide that the test piece returns to the zero
6
position after every deflection. After 1 × 10 flexes, carry out a visual examination of the test piece.
5.2.4 Results
For ready-shaped non-metallic perforation resistant inserts, the two results for the two different sizes
shall be reported.
In case of unshaped material, the 2 results shall be reported.
5.2.5 Test report
The test report shall include the following information:
a) a reference to this document, i.e. ISO 22568-4:2021;
b) a full description of the samples tested including sizes, commercial styles, codes, colours, nature,
etc.;
c) the results of the visual examination;
d) description of any change of the test piece (for example delamination);
e) any deviation by agreement and otherwise from the present test method.
5
© ISO 2021 – All rights reserved

---------------------- Page: 17 ----------------------
SIST EN ISO 22568-4:2022
ISO 22568-4:2021(E)
5.3 Test methods for the assessment non-metallic perforation resistant inserts
in critical environment
5.3.1 Sampling
In case of ready-shaped non-metallic perforation resistant inserts, samples of two different sizes shall
be tested. For unshaped material cut out two suitable test pieces, giving them a shape similar to a
typical insole of approximate size 41 to 42 (Paris Point).
New samples shall be used for each of the following 4 treatments.
5.3.2 Effect of high temperature
Clamp the specimen into the perforation device and place them in an oven with forced air circulation,
which is maintained at (60 ± 2) °C for 4 h ± 10 min; reduce the temperature to (45 ± 2) °C for another
18 h to 20 h. Remove the assembly from the oven and, within 2 min ± 30 s from removing it from the
oven (or from an insulating box which may be used if necessary), start performing the perforation test
in accordance with the method described in 5.1.
5.3.3 Effect of acid sweat
The non-metallic perforation resistant insert shall be totally immersed in an acid sweat solution,
as specified in ISO 105-E04: 2013, 4.4, at (23 ± 2) °C for 24 h ± 15 min. Remove, wash off any excess
sweat with water and store at (23 ± 2) °C for (24 ± 1) h before testing it in accordance with the method
described in 5.1.
5.3.4 Effect of alkali sweat
The non-metallic perforation resistant insert shall be totally immersed in an alkali sweat solution,
as specified in ISO 105-E04: 2013, 4.3, at (23 ± 2) °C for 24 h ± 15 min. Remove, wash off any excess
sweat with water and store at (23 ± 2) °C for (24 ± 1) h before testing it in accordance with the method
described in 5.1.
5.3.5 Effect of fuel oil
Totally immerse the perforation resistant insert in 2,2,4-trimethylpentane (iso-octane) at (23 ± 2) °C
for 24 h ± 15 min. Remove, dry off any excess liquid and store at (23 ± 2) °C for (24 ± 1) h before testing
it in accordance with the method described in 5.1.
5.3.6 Results
For ready-shaped non-metallic perforation resistant inserts, the two results for the 2 different sizes of
the 4 treatments shall be reported.
In case of unshaped material, the two results of the four treatments shall be reported.
5.3.7 Test report
The test report shall include the following information:
a) a reference to this document, i.e. ISO 22568-4:2021;
b) a full description of the samples tested including commercial sizes, styles codes, colours, nature,
etc.;
c) the results obtained after the four
...