EN ISO 180:2023

SLOVENSKI STANDARD
01-september-2023
Polimerni materiali - Ugotavljanje udarne žilavosti po Izodu (ISO 180:2023)
Plastics - Determination of Izod impact strength (ISO 180:2023)
Kunststoffe - Bestimmung der Izod-Schlagzähigkeit (ISO 180:2023)
Plastiques - Détermination de la résistance au choc Izod (ISO 180:2023)
Ta slovenski standard je istoveten z: EN ISO 180:2023
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 180
EUROPEAN STANDARD
NORME EUROPÉENNE
June 2023
EUROPÄISCHE NORM
ICS 83.080.01 Supersedes EN ISO 180:2019
English Version
Plastics - Determination of Izod impact strength (ISO
180:2023)
Plastiques - Détermination de la résistance au choc Kunststoffe - Bestimmung der Izod-Schlagzähigkeit
Izod (ISO 180:2023) (ISO 180:2023)
This European Standard was approved by CEN on 18 May 2023.

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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 180:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 180:2023) has been prepared by Technical Committee ISO/TC 61 "Plastics" in
collaboration with Technical Committee CEN/TC 249 “Plastics” the secretariat of which is held by SIS.
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 2023, and conflicting national standards
shall be withdrawn at the latest by December 2023.
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 180:2019.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 180:2023 has been approved by CEN as EN ISO 180:2023 without any modification.

INTERNATIONAL ISO
STANDARD 180
Fifth edition
2023-06
Plastics — Determination of Izod
impact strength
Plastiques — Détermination de la résistance au choc Izod
Reference number
ISO 180:2023(E)
ISO 180:2023(E)
© ISO 2023
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
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Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 180:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Apparatus . 2
5.1 Test machine . 2
5.2 Micrometers and gauges . 3
6 Test specimens . 3
6.1 Preparation . 3
6.1.1 Moulding and extrusion compounds . 3
6.1.2 Sheets . 6
6.1.3 Long-fibre-reinforced materials . . 6
6.1.4 Checking . . 6
6.1.5 Notching . 6
6.2 Anisotropy . 7
6.3 Shape and dimensions . 7
6.3.1 General . 7
6.3.2 Moulding and extrusion compounds . 7
6.3.3 Sheet materials, including long-fibre-reinforced materials . 7
6.4 Number of test specimens . 8
6.5 Conditioning. 8
7 Procedure .8
8 Calculation and expression of results . 9
8.1 Unnotched specimens . 9
8.2 Notched specimens . 9
8.3 Statistical parameters. 9
8.4 Significant figures. 9
9 Precision . 9
10 Test report .10
Annex A (informative) Precision statement .12
Bibliography .14
iii
ISO 180:2023(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 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 61, Plastics, Subcommittee SC 2,
Mechanical behavior, in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation between
ISO and CEN (Vienna Agreement).
This fifth edition cancels and replaces the fourth edition (ISO 180:2019), which has been technically
revised.
The main changes are as follows:
— results of an interlaboratory test for unnotched specimens (see Annex A) have been added;
— reference to standard ISO 16012 (see the Bibliography and 5.2) has been added;
— symbols used in Formulae (1) and (2) have been reviewed and updated;
— method designation in Clause 10 b) have been reviewed and updated.
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 180:2023(E)
Introduction
The Izod impact strength determination method is suitable for use with the following range of materials:
— rigid thermoplastic moulding and extrusion materials, including filled and reinforced compounds
in addition to unfilled types; rigid thermoplastics sheets;
— rigid thermosetting moulding materials, including filled and reinforced compounds; rigid
thermosetting sheets, including laminates;
— fibre-reinforced thermosetting and thermoplastic composites incorporating unidirectional or
non-unidirectional reinforcements such as mat, woven fabrics, woven rovings, chopped strands,
combination and hybrid reinforcements, rovings and milled fibres and sheet made from pre-
impregnated materials (prepregs);
— thermotropic liquid-crystal polymers.
The method is not normally suitable for use with rigid cellular materials and sandwich structures
containing cellular material. Notched specimens are also not normally used for long-fibre-reinforced
composites or thermotropic liquid-crystal polymers.
The method is suited to the use of specimens which can be either moulded to the chosen dimensions,
machined from the central portion of a standard multipurpose test specimen (see ISO 20753) or
machined from finished or semi-finished products such as mouldings, laminates and extruded or cast
sheet.
v
INTERNATIONAL STANDARD ISO 180:2023(E)
Plastics — Determination of Izod impact strength
1 Scope
This document specifies a method for determining the Izod impact strength of plastics under defined
conditions. A number of different types of specimen and test configurations are defined. Different test
parameters are specified according to the type of material, the type of test specimen and the type of
notch.
The method is used to investigate the behaviour of specified types of specimen under the impact
conditions defined and for estimating the brittleness or toughness of specimens within the limitations
inherent in the test conditions.
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 291, Plastics — Standard atmospheres for conditioning and testing
ISO 293, Plastics — Compression moulding of test specimens of thermoplastic materials
ISO 294-1, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 1: General
principles, and moulding of multipurpose and bar test specimens
ISO 295, Plastics — Compression moulding of test specimens of thermosetting materials
ISO 1268 (all parts), Fibre-reinforced plastics — Methods of producing test plates.
ISO 2818, Plastics — Preparation of test specimens by machining
ISO 10724-1, Plastics — Injection moulding of test specimens of thermosetting powder moulding compounds
(PMCs) — Part 1: General principles and moulding of multipurpose test specimens
ISO 13802, Plastics — Verification of pendulum impact-testing machines — Charpy, Izod and tensile
impact-testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
Izod impact strength of unnotched specimen
a
iU
impact energy absorbed in breaking an unnotched specimen, referred to the original cross-sectional
area of the specimen
Note 1 to entry: It is expressed in kilojoules per square metre (kJ/m ).
ISO 180:2023(E)
3.2
Izod impact strength of notched specimen
a
iN
impact energy absorbed in breaking a notched specimen, referred to the original cross-sectional area
of the specimen at the notch, with the pendulum striking the face containing the notch
Note 1 to entry: It is expressed in kilojoules per square metre (kJ/m ).
3.3
parallel direction of blow
p
impact with the direction of blow parallel to the plane of reinforcement
Note 1 to entry: The direction of the blow in the Izod test is usually “edgewise parallel” (ep) (see Figure 1).
3.4
normal direction of blow
n
impact with the direction of blow normal to the plane of reinforcement
Note 1 to entry: This kind of impact is not usually used with the Izod test, but is indicated for the sake of
completion (see also Figure 1).
4 Principle
The test specimen, supported as a vertical cantilever beam, is broken by a single impact of a striker,
with the line of impact a fixed distance from the specimen clamp and, in the case of notched specimens,
from the centreline of the notch (see Figure 2).
The method specifies preferred dimensions for the test specimen. Tests which are carried out on
specimens of different dimensions or with different notches, or specimens which are prepared under
different conditions, may produce results which are not comparable. Other factors, such as the energy
capacity of the apparatus, its impact velocity and the conditioning of the specimens can also influence
...