EN ISO 294-4:2019

SLOVENSKI STANDARD
01-april-2019
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SIST EN ISO 294-4:2003
SIST EN ISO 294-4:2003/AC:2011
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Plastics - Injection moulding of test specimens of thermoplastic materials - Part 4:
Determination of moulding shrinkage (ISO 294-4:2018)
Kunststoffe - Spritzgießen von Probekörpern aus Thermoplasten - Teil 4: Bestimmung
der Verarbeitungsschwindung (ISO 294-4:2018)
Plastiques - Moulage par injection des éprouvettes de matériaux thermoplastiques -
Partie 4: Détermination du retrait au moulage (ISO 294-4:2018)
Ta slovenski standard je istoveten z: EN ISO 294-4:2019
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 294-4
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2019
EUROPÄISCHE NORM
ICS 83.080.20 Supersedes EN ISO 294-4:2003
English Version
Plastics - Injection moulding of test specimens of
thermoplastic materials - Part 4: Determination of
moulding shrinkage (ISO 294-4:2018)
Plastiques - Moulage par injection des éprouvettes de Kunststoffe - Spritzgießen von Probekörpern aus
matériaux thermoplastiques - Partie 4: Détermination Thermoplasten - Teil 4: Bestimmung der
du retrait au moulage (ISO 294-4:2018) Verarbeitungsschwindung (ISO 294-4:2018)
This European Standard was approved by CEN on 18 January 2019.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 294-4:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 294-4:2019) 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 August 2019, and conflicting national standards shall
be withdrawn at the latest by August 2019.
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 294-4:2003.
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, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 294-4:2018 has been approved by CEN as EN ISO 294-4:2019 without any modification.

INTERNATIONAL ISO
STANDARD 294-4
Third edition
2018-12
Plastics — Injection moulding of
test specimens of thermoplastic
materials —
Part 4:
Determination of moulding shrinkage
Plastiques — Moulage par injection des éprouvettes de matériaux
thermoplastiques —
Partie 4: Détermination du retrait au moulage
Reference number
ISO 294-4:2018(E)
©
ISO 2018
ISO 294-4:2018(E)
© ISO 2018
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.
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Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2018 – All rights reserved

ISO 294-4:2018(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Apparatus . 2
5 Procedure. 3
5.1 Conditioning of material . 3
5.2 Injection moulding . 3
5.3 Measurement of mould temperature. 4
5.4 Measurement of melt temperature . 4
5.5 Treatment of test specimens after demoulding . 4
5.6 Measurement of moulding shrinkage . 5
5.7 Treatment following measurement of moulding shrinkage . 5
5.8 Measurement of post-moulding shrinkage . 5
6 Expression of results . 6
6.1 Moulding shrinkage . 6
6.2 Post-moulding shrinkage . 6
6.3 Total shrinkage . 6
7 Precision . 7
8 Test report . 7
Annex A (informative) Reference points for length and width measurement .8
Bibliography . 9
ISO 294-4:2018(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 61, Plastics, Subcommittee SC 9,
Thermoplastic materials.
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.
This third edition cancels and replaces the second edition (ISO 294-4:2001), of which it constitutes
a minor revision to update the reference in Clause 2. It also incorporates the Technical Corrigendum
ISO 294-4:2001/Cor.1:2007.
A list of all parts in the ISO 294 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved

ISO 294-4:2018(E)
Introduction
See ISO 294-1.
In the injection moulding of thermoplastics, the difference between the dimensions of the mould cavity
and those of the moulded articles produced from it can vary with the design and operation of the mould.
Such differences can depend on the size of the injection-moulding machine, the shape and dimensions of
mouldings including any restrictive action this can have on the shrinkage, the degree and direction of flow
or movement of the material in the mould, the sizes of the nozzle, sprue, runner and gate, the cycle on which
the machine is operated, the temperature of the melt and the mould, and the magnitude and duration of
the hold pressure. Moulding and post-moulding shrinkage are caused by crystallization, volume relaxation
and orientation relaxation of the material and by thermal contraction of both the thermoplastic material
and the mould. Post-moulding shrinkage can also be influenced by humidity uptake.
The measurement of moulding and post-moulding shrinkage is useful in making comparisons between
thermoplastics and in checking uniformity of manufacture.
The method is not intended as a source of data for design calculations of components. Information on
the typical behaviour of a material can be obtained, however, by carrying out measurements at different
melt and mould temperatures, injection velocities and hold pressures, as well as at different values of
other injection-moulding parameters. The information thus obtained is important in establishing the
suitability of the moulding material for the production of moulded articles with accurate dimensions.
INTERNATIONAL STANDARD ISO 294-4:2018(E)
Plastics — Injection moulding of test specimens of
thermoplastic materials —
Part 4:
Determination of moulding shrinkage
1 Scope
This document specifies a method of determining the moulding shrinkage and post-moulding shrinkage
of injection-moulded test specimens of thermoplastic material in the directions parallel to and normal
to the direction of melt flow.
[2]
For the determination of shrinkage of thermosets, see ISO 2577 .
Moulding shrinkage as defined in this document excludes the effects of humidity uptake. This is included
in post-moulding shrinkage and thus in total shrinkage. For cases when post-moulding shrinkage is
[1]
caused by the uptake of humidity only, see ISO 175 .
Moulding shrinkage as defined in this document represents the so-called fr
...