EN ISO 293:2003
(Main)Plastics - Compression moulding test specimens of thermoplastic materials (ISO 293:1986)
Plastics - Compression moulding test specimens of thermoplastic materials (ISO 293:1986)
The method described uses the changes of electrical and/or chemical characteristics of askarels, as well as various physical tests on materials exposed to askarels, in order to eliminate those materials which are not suitable owing to their contaminating effect on askarels.
Kunststoffe - Formgepresste Probekörpern aus Thermoplasten (ISO 293:1986)
Diese Internationale Norm legt die allgemeinen Prinzipien und Verfahren fest, die bei der Herstellung von formgepressten Probekörpern und Platten, aus denen Prüfstücke durch maschinelles Bearbeiten oder Stanzen hergestellt werden können, zu befolgen sind.
Zur Erzielung eines vergleichbaren Zustandes der Formpressteile sind die Hauptschritte des Verfahrens, einschließlich vier unterschiedlicher Abkühlverfahren, genormt. Die erforderliche Presstemperatur und die Abkühlverfahren müssen für jedes Material so sein, wie es in der entsprechenden Internationalen Norm festgelegt ist oder zwischen den beteiligten Partnern vereinbart wurde.
ANMERKUNG Das Verfahren wird nicht für verstärkte thermoplastische Kunststoffe empfohlen.
Plastiques - Moulage par compression des éprouvettes en matières thermoplastiques (ISO 293:1986)
La méthode décrite utilise les modifications des caractéristiques électriques et/ou chimiques des askarels ainsi que divers essais physiques effectués sur les matériaux exposés aux askarels, afin d'éliminer les matériaux qui ne conviennent pas par suite de leur effet contaminant sur les askarels.
Polimerni materiali - Preskušanci plastomerov, oblikovani s stiskanjem (ISO 293:1986)
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 293:2003
01-julij-2003
Polimerni materiali - Preskušanci plastomerov, oblikovani s stiskanjem (ISO
293:1986)
Plastics - Compression moulding test specimens of thermoplastic materials (ISO
293:1986)
Kunststoffe - Formgepresste Probekörpern aus Thermoplasten (ISO 293:1986)
Plastiques - Moulage par compression des éprouvettes en matieres thermoplastiques
(ISO 293:1986)
Ta slovenski standard je istoveten z: EN ISO 293:2003
ICS:
83.080.20 Plastomeri Thermoplastic materials
SIST EN ISO 293:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 293:2003
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SIST EN ISO 293:2003
EUROPEAN STANDARD
EN ISO 293
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2003
ICS 83.080.20
English version
Plastics - Compression moulding test specimens of
thermoplastic materials (ISO 293:1986)
Plastiques - Moulage par compression des éprouvettes en Kunststoffe - Formgepresste Probekörpern aus
matières thermoplastiques (ISO 293:1986) Thermoplasten (ISO 293:1986)
This European Standard was approved by CEN on 9 January 2003.
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 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 Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, 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
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 293:2003 E
worldwide for CEN national Members.
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SIST EN ISO 293:2003
EN ISO 293:2003 (E)
CORRECTED 2003-03-26
Foreword
The text of ISO 293:1986 has been prepared by Technical Committee ISO/TC 61 "Plastics” of
the International Organization for Standardization (ISO) and has been taken over as EN ISO
293:2003 by 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 September 2003, and conflicting national
standards shall be withdrawn at the latest by September 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, Czech
Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and
the United Kingdom.
Endorsement notice
The text of ISO 293:1986 has been approved by CEN as EN ISO 293:2003 without any
modifications.
2
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SIST EN ISO 293:2003
International Standard
INTERNATiONAL ORGANIZATION FOR STANDARDIZATlON.MEX~YHAPO~HAR OPrAHM3ALWlR 00 CTAH~APTM3A~Wl.ORGANISATlON INTERNATIONALE DE NORMALISATION
Plastics - Compression moulding test specimens
of thermoplastic materials
Moulage par compression des eprouvettes en matikres thermoplastiques
Plastigues -
Second edition - 1986-10-01
Ref. No. IS0 2934986 (E)
UDC 678.073 : 678.027.72 : 620.11
Descriptors : plastics, thermoplastic resins, moulding materials, compression moulding, test specimens, specimen preparation.
Price based on 4 pages
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SIST EN ISO 293:2003
Foreword
IS0 (the International Organization for Standardization) is a worldwide federation of
national standards bodies (IS0 member bodies). The work of preparing International
Standards is normally carried out through IS0 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, govern-
mental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the IS0 Council. They are approved in accordance with IS0 procedures requiring at
least 75 % approval by the member bodies voting.
international Standard IS0 293 was prepared by Technical Committee ISO/TC 61,
Plastics.
This second edition cancels and replaces the first edition (IS0 293-19741, of which it
constitutes a technical revision.
Users should note that all International Standards undergo revision from time to time
and that any reference made herein to any other International Standard implies its
latest edition, unless othennlise stated.
0 International Organization for Standardization, 1986
Printed in Switzerland
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SIST EN ISO 293:2003
INTERNATIONAL STANDARD IS0 293-1986 (E)
Plastics - Compression moulding test specimens
of thermoplastic materials
0 Introduction moulding temperature: The temperature of the mould
31
0; the press platens during the preheating and moulding time,
For reproducible test results, specimens with a defined state measured in the nearest vicinity to the moulded material.
are required. In contrast to injection moulding, the aim of com-
pression moulding is to produce test specimens and sheets for
3.2 demoulding temperature: The temperature of the
machining or stamping of test specimens that are homo-
mould or the press platens at the end of the cooling time,
geneous and isotropic.
measured in the nearest vicinity to the moulded material.
In the process of compression moulding, mixing of material
NOTE - For positive moulds, holes are normally drilled in the mould
takes place on a negligible scale. Granules and powders fuse
for measuring the temperatures defined in 3.1 and 3.2.
only at their surfaces and preforms (milled sheets) are only par-
tially softened.
3.3 preheating time: The time required to heat the material
Isotropic and homogeneous specimens can, therefore, only be
in the mould up to the moulding temperature while maintaining
obtained when the moulding material is itself homogeneous
the contact pressure.
and isotropic. This has to be considered when processing
multiphase materials, such as ABS, which retain their internal
structure.
moulding time: The time during which full pressure is
3.4
applied while maintaining the moulding temperature.
1 Scope and field of application
3.5 average cooling rate (non-linear) : Rate of cooling by a
constant flow of the cooling fluid, calculated by dividing the
This International Standard specifies the general principles and
difference between moulding and demoulding temperatures by
the procedures to be followed with thermoplastics in the prep-
the time required to cool the mould to the demoulding tem-
aration of compression-moulded test specimens and sheets
perature.
from which test specimens may be machined or stamped.
The average cooling rate is usually expressed in kelvins per
In order to obtain mouldings in a reproducible state, the main
minute.
steps of the procedure, including four different cooling
methods, are standardized. For each material, the required
moulding temperature and cooling methods shall be as
cooling rate: Constant rate of cooling in a defined tem-
3.6
specified in the appropriate International Standard for the
perature range obtained by controlling the flow of the cooling
material or as agreed between the interested parties.
fluid in such a way that over each 10 min interval the deviation
from this specified cooling rate shall not exceed the specified
NOTE - The procedure is not recommended for reinforced thermo-
tolerance.
plastics.
The cooling rate is usually expressed in kelvins per hour.
2 References
IS01 R 286, /SO system of limits and fits - Part I: General,
4 Apparatus
tolerances and deviations.
IS0 468, Surface roughness - Parameters, their values and
4.1 Moulding press
general rules for specifying requirements.
The press shall have a clamping force capable of applying a
pressure (conventionally given as the ratio of the clamping
force to the area of the mould cavity) of at least 10 MPa.
3 Definitions
For the purpose of this International Standard, the following The pressure shall be maintained to within 10 % of the
specified pressure during the moulding cycle.
definitions apply.
1
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SIST EN ISO 293:2003
IS0 2934986 (El
condition on the specimens (recommended surface roughness
The platens shall be capable of
0,16 I?,, see IS0 468). Specimen removal can be made easier
a) being heated to at least 240 OC; by chromium plating these surfaces. For specimens of small
dimensions a 2O taper is strongly recommended.
being cooled at a rate given in the table.
b)
Blind holes may be drilled in the mould so that temperature can
The difference between the temperatures of any points of the
be measured in the vicinity of the moulded material by using
mould surfaces shall not vary by more than +2 K during thermocouples or mercury thermometers.
heating and k4 K during cooling.
NOTES
rated in the
When the heating and cooling system is incorpo
1 Depending on the performance
...
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