EN ISO 8256:2004

Plastics - Determination of tensile-impact strength (ISO 8256:2004)

ISO 8256:2004 specifies two methods (method A and method B) for the determination of the tensile-impact strength of plastics under defined conditions. The tests can be described as tensile tests at relatively high strain rates. These methods can be used for rigid materials (as defined in ISO 472), but are especially useful for materials too flexible or too thin to be tested with impact tests conforming to ISO 179 or ISO 180.
These methods are used for investigating the behaviour of specified specimens under specified impact velocities, and for estimating the brittleness or the toughness of specimens within the limitations inherent in the test conditions.
These methods are applicable both to specimens prepared from moulding materials and to specimens taken from finished or semi-finished products (for example mouldings, films, laminates, or extruded or cast sheets).
Results obtained by testing moulded specimens of different dimensions may not necessarily be the same. Equally, specimens cut from moulded products may not give the same results as specimens of the same dimensions moulded directly from the material. Test results obtained from specimens prepared from moulding compounds cannot be applied directly to mouldings of any given shape, because values may depend on the design of the moulding and the moulding conditions. Results obtained by method A and method B may or may not be comparable.
These methods are not suitable for use as a source of data for design calculations on components. Information on the typical behaviour of a material can be obtained, however, by testing different types of test specimen prepared under different conditions, and by testing at different temperatures. The two different methods are suitable for production control as well as for quality control.

Kunststoffe - Bestimmung der Schlagzugzähigkeit (ISO 8256:2004)

Diese Internationale Norm legt zwei Verfahren (Verfahren A und Verfahren B) zur Bestimmung der Schlag-zugzähigkeit von Kunststoffen unter festgelegten Bedingungen fest. Die Prüfungen können als Zugversuche mit verhältnismäßig hoher Verformungsgeschwindigkeit bezeichnet werden. Diese Verfahren können bei steifen Werk-stoffen angewendet werden, sie sind jedoch besonders bei Werkstoffen von Nutzen, die für die Schlagbiege-prüfungen nach ISO 179 und ISO 180 zu flexibel oder zu dünn sind.
1.2   Diese Verfahren werden benutzt, um das Verhalten festgelegter Probekörper bei festgelegten Schlag-geschwindigkeiten zu untersuchen und die Sprödigkeit oder Zähigkeit von Probekörpern innerhalb der Grenzen der Prüfbedingungen festzustellen.
1.3   Diese Verfahren sind sowohl für Probekörper geeignet, die aus Formmassen hergestellt sind als auch für Probekörper, die Formteilen und Halbzeugen entnommen sind (zum Beispiel aus Spritzgussteilen, Folien, Schicht-stoffen, extrudierten oder gegossenen Tafeln).
1.4   Ergebnisse, die bei der Prüfung von geformten Probekörpern unterschiedlicher Maße gewonnen wurden, müssen nicht notwendigerweise gleich sein. Ebenso müssen aus Formteilen ausgearbeitete Probekörper nicht zu den gleichen Ergebnisse führen, wie direkt aus der Formmasse geformte Probekörper gleicher Maße. An aus Formmassen hergestellten Probekörpern erhaltene Prüfergebnisse können nicht unmittelbar auf Formteile irgend-einer Form übertragen werden, da die Messwerte von der Formteilgestalt und den Bedingungen der Formgebung abhängen können. Ergebnisse nach den Verfahren  A und B können vergleichbar sein oder nicht.

Plastiques - Détermination de la résistance au choc-traction (ISO 8256:2004)

L'ISO 8256:2004 spécifie deux méthodes (la méthode A et la méthode B) permettant de déterminer la résistance au choc-traction des plastiques dans des conditions définies. Les essais peuvent être décrits comme des essais de traction conduits à des vitesses de déformation relativement élevées. Ces méthodes peuvent être utilisées avec des matériaux rigides (tels que définis dans l'ISO 472) mais elles se révèlent particulièrement utiles dans le cas des matériaux trop flexibles ou trop minces pour être soumis aux essais de choc conformément aux ISO 179 et ISO 180.
Ces méthodes sont utilisées pour étudier le comportement d'éprouvettes spécifiées, à des vitesses de choc définies, et pour évaluer la fragilité ou la ténacité d'éprouvettes dans les limites spécifiques des conditions d'essai.
Ces méthodes sont applicables à la fois aux éprouvettes préparées à partir de matériaux pour moulage et aux éprouvettes prélevées dans des produits finis ou semi-finis (par exemple, objets moulés, films, stratifiés, plaques extrudées ou coulées).
Les résultats obtenus en soumettant à l'essai des éprouvettes moulées de différentes dimensions peuvent ne pas être nécessairement identiques. De même, des éprouvettes découpées dans des produits moulés peuvent ne pas donner les mêmes résultats que des éprouvettes de mêmes dimensions, moulées directement à partir du matériau. Les résultats d'essai provenant d'éprouvettes constituées de mélanges pour moulage ne peuvent pas être directement appliqués à des objets moulés d'une quelconque forme car les valeurs peuvent dépendre de la forme de l'objet moulé et des conditions de moulage. Les résultats obtenus par les méthodes A et B peuvent être comparables ou ne pas l'être.
Ces méthodes ne sont pas adaptées à une utilisation en tant que source de données pour les calculs effectués lors de la conception des pièces. Cependant, elles permettent d'obtenir des informations sur le comportement type d'un matériau si l'on soumet à l'essai divers types d'éprouvettes préparées dans des conditions différentes et si les essais sont conduits à différentes températures. Les deux méthodes décrites conviennent pour les contrôles de la production et les contrôles de la qualité.

Polimerni materiali – Določevanje natezno-udarne trdnosti (ISO 8256:2004)

General Information

• Status: Withdrawn
• Publication Date: 30-Jun-2004
• Withdrawal Date: 12-Dec-2023
• ICS: 83.080.01 - Plastics in general
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249 - Plastics
• Ref Project: SIST EN ISO 8256:2004 - Plastics - Determination of tensile-impact strength (ISO 8256:2004)

Relations

• Replaces: EN ISO 8256:1996 - Plastics - Determination of tensile-impact strength (ISO 8256:1990, including Technical Corrigendum 1:1991)
• Effective Date: 22-Dec-2008
• Replaced By: EN ISO 8256:2023 - Plastics - Determination of tensile-impact strength (ISO 8256:2023)
• Effective Date: 18-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-oktober-2004
1DGRPHãþD
SIST EN ISO 8256:1999
3ROLPHUQLPDWHULDOL±'RORþHYDQMHQDWH]QRXGDUQHWUGQRVWL,62
Plastics - Determination of tensile-impact strength (ISO 8256:2004)
Kunststoffe - Bestimmung der Schlagzugzähigkeit (ISO 8256:2004)
Plastiques - Détermination de la résistance au choc-traction (ISO 8256:2004)
Ta slovenski standard je istoveten z: EN ISO 8256:2004
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.

EUROPEAN STANDARD
EN ISO 8256
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2004
ICS 83.080.01 Supersedes EN ISO 8256:1996
English version
Plastics - Determination of tensile-impact strength (ISO
8256:2004)
Plastiques - Détermination de la résistance au choc-
traction (ISO 8256:2004)
This European Standard was approved by CEN on 1 June 2004.

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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8256:2004: E
worldwide for CEN national Members.

Foreword
This document (EN ISO 8256:2004) 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 IBN.
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 January 2005, and conflicting national
standards shall be withdrawn at the latest by January 2005.

This document supersedes EN ISO 8256:1996.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Cyprus,
Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Endorsement notice
The text of ISO 8256:2004 has been approved by CEN as EN ISO 8256:2004 without any
modifications.
INTERNATIONAL ISO
STANDARD 8256
Second edition
2004-07-01
Plastics — Determination of
tensile-impact strength
Plastiques — Détermination de la résistance au choc-traction

Reference number
ISO 8256:2004(E)
©
ISO 2004
ISO 8256:2004(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.

©  ISO 2004
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail [e-mail]
Web www.iso.org
Published in Switzerland
ii © ISO 2004 – All rights reserved

ISO 8256:2004(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references. 1
3 Terms and definitions. 2
4 Principle. 2
5 Apparatus. 3
5.1 Test machine. 3
5.2 Pendulum and striker. 3
5.3 Crosshead. 3
5.4 Clamping devices/jaws. 3
5.5 Micrometers and gauges. 3
6 Test specimens. 4
6.1 Shape and dimensions. 4
6.2 Preparation. 6
6.3 Notching of specimens. 6
6.4 Number of test specimens . 6
6.5 Anisotropy. 6
6.6 Conditioning. 7
7 Procedure. 7
8 Determination of energy corrections . 8
8.1 Method A — Correction E due to the plastic deformation and the kinetic energy of the
q
crosshead . 8
8.2 Method B — Crosshead-bounce energy E . 8
b
9 Calculation and expression of results . 8
9.1 Calculation of corrected tensile-impact energy. 8
9.2 Calculation of tensile-impact strength. 9
9.3 Statistical parameters. 9
9.4 Number of significant figures . 9
10 Precision. 9
11 Test report. 10
Annex A (normative) Determination of correction factor for method A . 11
Annex B (normative) Determination of bounce-correction factor for method B . 14
Bibliography . 16

ISO 8256:2004(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 8256 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical
properties.
This second edition cancels and replaces the first edition (ISO 8256:1990), which has been technically revised.

iv © ISO 2004 – All rights reserved

INTERNATIONAL STANDARD ISO 8256:2004(E)

Plastics — Determination of tensile-impact strength
1 Scope
1.1 This International Standard specifies two methods (method A and method B) for the determination of
the tensile-impact strength of plastics under defined conditions. The tests can be described as tensile tests at
relatively high strain rates. These methods can be used for rigid materials (as defined in ISO 472), but are
especially useful for materials too flexible or too thin to be tested with impact tests conforming to ISO 179 or
ISO 180.
1.2 These methods are used for investigating the behaviour of specified specimens under specified impact
velocities, and for estimating the brittleness or the toughness of specimens within the limitations inherent in
the test conditions.
1.3 These methods are applicable both to specimens prepared from moulding materials and to specimens
taken from finished or semi-finished products (for example mouldings, laminates, or extruded or cast sheets).
1.4 Results obtained by testing moulded specimens of different dimensions may not necessarily be the
same. Equally, specimens cut from moulded products may not give the same results as specimens of the
same dimensions moulded directly from the material. Test results obtained from specimens prepared from
moulding compounds cannot be applied directly to mouldings of any given shape, because values may
depend on the design of the moulding and the moulding conditions. Results obtained by method A and
method B may or may not be comparable.
1.5 These methods are not suitable for use as a source of data for design calculations on components.
Information on the typical behaviour of a material can be obtained, however, by testing different types of test
specimen prepared under different conditions, and by testing at different temperatures. The two different
methods are suitable for production control as well as for quality control.
2 Normative references
The following referenced documents are indispensable for the application 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 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact test
ISO 179-2, Plastics — Determination of Charpy impact properties — Part 2: Instrumented impact test
ISO 180, Plastics — Determination of Izod impact strength
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 293, Plastics — Compression moulding of test specimens of thermoplastic materials
ISO 294-1, Plastics — Inj
...