April 2011
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03.11
DIN EN ISO 178:2011-04
A comma is used as the decimal marker.
National foreword
This standard has been prepared by Technical Committee ISO/TC 61 “Plastics” in collaboration with Technical Committee CEN/TC 249 “Plastics” (Secretariat: NBN, Belgium).
editoriallyThe responsible German body involved in its preparation was the Normenausschuss Kunststoffe (Plastics Standards Committee), Working Committee NA 054-01-02 AA Mechanische Eigenschaften und Probekörperherstellung.
The International Standards referred to in this document have been published as the corresponding DIN EN or DIN EN ISO Standards with the same number. For the International Standards ISO 2602, ISO 16012 and ISO 20753 there are no national standards available.
Amendments
This standard differs from DIN EN ISO 178:2006-04 as follows:
a) the standard has been editorially revised;
b) normative references in Clause 2 have been updated; they are now undated (except for ISO 294-1);
c) Clause 4 “Principle” has been reworded;
d) Figure 3 “Accuracy requirements for determination of flexural modulus” and Figure 5 “Cross-section
of injection-moulded test specimen showing sink marks and draft angle (exaggerated) have been added; the remaining figures have been renumbered;
e) the former Annex A “Compliance correction” has been deleted and thus the former Annex B is now
Annex A “Precision statement”;
f) Annex B (informative) “Influence of changes in test speed on the measured values of flexural
properties” has been added;
g) the Bibliography has been added.
Previous editions
DIN 53452: 1941-05, 1944-11, 1955x-02, 1977-04
DIN 53453: 1943-11, 1952-02, 1954-07, 1958-05, 1965-10, 1975-05
DIN 53457: 1968-05, 1987-06, 1987-10
DIN EN ISO 178: 1997-02, 2003-06, 2006-04
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EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN ISO 178  December
2010
ICS 83.080.01Supersedes EN ISO 178:2003
English Version
Plastics —
Determination of flexural properties
(ISO 178:2010)
Plastiques —
Détermination des propriétés en flexion
ISO 178:2010)
Kunststoffe —  Bestimmung der Biegeeigenschaften
(ISO 178:2010)
This European Standard was approved by CEN on 14 December 2010.
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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
C O M I TÉE U R O PÉE N
D
E N O R M A LI S A T I O N
EUR OPÄIS C HES KOM ITEE FÜR NOR M UNG
Management Centre:  Avenue Marnix 17,  B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved
worldwide for CEN national Members.
Ref. No. EN ISO 178:2010: E
Contents
Page
<.3 4 2 5 3 Terms 5 4 Principle .................................................................................................................................................8 5 8 5.8 5.2 .8 5.3 Supports and .9 5.4 Force- and 9 5.5 Equipment for measuring the width and thickness of the 10 6
11 6.1 Shape 11 6.2 12 6.3 Preparation of .12 6.4 13 6.5 Number of .13 7 Atmosphere for conditioning 13 13 9 Calculation and expression 16 9.1 16 9.2 16 9.3 17 9.4 .17 9.
5 17 10 Precision ..............................................................................................................................................18 11
Test report (18)
Annex A  (informative)  .19 Annex B  (informative)  Influence of changes in test speed on the measured values of flexural
<21 Bibliography (22)
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EN ISO 178:2010 (E)
DIN EN ISO 178:2011-04
DIN EN ISO 178:2011-04
EN ISO 178:2010 (E)
Foreword
This document (EN ISO 178:2010) 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 NBN.
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 2011, and conflicting national standards shall be withdrawn at the latest by June 2011.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 178:2003.
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, Icel
and, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 178:2010 has been approved by CEN as a EN ISO 178:2010 without any modification.
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