EN ISO 11542-2:1998

SLOVENSKI STANDARD
01-maj-2000
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Plastics - Ultra-high-molecular-weight polyethylene (PE-UHMW) moulding and extrusion
materials - Part 2: Preparation of test specimens and determination of properties (ISO
11542-2:1998)
Kunststoffe - Ultrahochmolekulares Polyethylen (PE-UHMW)- Formmassen - Teil 2:
Herstellung von Probekörpern und Bestimmung von Eigenschaften (ISO 11542-2:1998)
Plastiques - Matériaux a base de polyéthylene a tres haute masse moléculaire (PE-
UHMW) pour moulage et extrusion - Partie 2: Préparation des éprouvettes et
détermination des propriétés (ISO 11542-2:1998)
Ta slovenski standard je istoveten z: EN ISO 11542-2:1998
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL ISO
STANDARD 11542-2
First edition
1998-11-15
Plastics — Ultra-high-molecular-weight
polyethylene (PE-UHMW) moulding
and extrusion materials —
Part 2:
Preparation of test specimens
and determination of properties
Plastics — Matériaux à base de polyéthylène à très haute masse
moléculaire (PE-UHMW) pour moulage et extrusion —
Partie 2: Préparation des éprouvettes et détermination des propriétés
A
Reference number
ISO 11542-2:1998(E)
ISO 11542-2:1998(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.
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.
International Standard ISO 11542-2 was prepared by Technical Committee
ISO/TC 61, Plastics, Subcommittee SC 9, Thermoplastic materials.
ISO 11542 consists of the following parts, under the general title Plastics —
Ultra-high-molecular-weight polyethylene (PE-UHMW) moulding and
extrusion materials:
— Part 1: Designation system and basis for specifications
— Part 2: Preparation of test specimens and determination of properties
Annexes A and B form an integral part of this part of ISO 11542.
©  ISO 1998
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 the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
©
INTERNATIONAL STANDARD  ISO ISO 11542-2:1998(E)
Plastics — Ultra-high-molecular-weight polyethylene (PE-UHMW)
moulding and extrusion materials —
Part 2:
Preparation of test specimens and determination of properties
1  Scope
This part of ISO 11542 specifies the methods of preparation of test specimens and the test methods to be used in
determining the properties of PE-UHMW moulding and extrusion materials. Requirements for handling test material
and for conditioning both the test material before moulding and the specimens before testing are given here.
Procedures and conditions for the preparation of test specimens and procedures for measuring properties of the
materials from which these specimens are made are given. Properties and test methods which are suitable and
necessary to characterize PE-UHMW moulding and extrusion materials are listed.
The properties have been selected from the general test methods in ISO 10350-1. Other test methods in wide use
for or of particular significance to these moulding and extrusion materials are also included in this part of ISO 11542,
as are the designatory properties specified in part 1.
In order to obtain reproducible and comparable test results, it is necessary to use the methods of preparation and
conditioning, the specimen dimensions and the test procedures specified herein. Values determined will not
necessarily be identical to those obtained using specimens of different dimensions or prepared using different
procedures.
2  Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
ISO 11542. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this part of ISO 11542 are encouraged to investigate the possibility of applying the
most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid
International Standards.
1)
ISO 62:— , Plastics — Determination of water absorption.
ISO 75-1:1993, Plastics — Determination of temperature of deflection under load — Part 1: General test method.
ISO 75-2:1993, Plastics — Determination of temperature of deflection under load — Part 2: Plastics and ebonite.
ISO 178:1993, Plastics — Determination of flexural properties.

1)
To be published. (Revision of ISO 62:1980)
©
ISO 11542-2:1998(E) ISO
2)
ISO 179-1:— , Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact test.
ISO 291:1997, Plastics — Standard atmospheres for conditioning and testing.
ISO 293:1986, Plastics — Compression moulding test specimens of thermoplastic materials.
ISO 527-1:1993, Plastics — Determination of tensile properties — Part 1: General principles.
ISO 527-2:1993, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and
extrusion plastics.
ISO 527-4:1997, Plastics — Determination of tensile properties — Part 4: Test conditions for isotropic and
orthotropic fibre-reinforced plastics composites.
ISO 899-1:1993, Plastics — Determination of creep behaviour — Part 1: Tensile creep.
ISO 1183:1987, Plastics — Methods for determining the density and relative density of non-cellular plastics.
3)
ISO 1210/IEC 60695-11-10:— , Determination of the burning behaviour of horizontal and vertical specimens in
contact with a small-flame (50 W) ignition source.
ISO 1628-3:1991, Plastics — Determination of viscosity number and limiting viscosity number — Part 3:
Polyethylenes and polypropylenes.
ISO 2818:1994, Plastics — Preparation of test specimens by machining.
4)
ISO 3146:— , Plastics — Determination of melting behaviour (melting temperature or melting range) of semi-
crystalline polymers by capillary tube and polarizing-microscope methods.
ISO 3167:1993, Plastics — Multipurpose test specimens.
ISO 4589-1:1996, Plastics — Determination of burning behaviour by oxygen index — Part 1: Guidance.
ISO 4589-2:1996, Plastics — Determination of burning behaviour by oxygen index — Part 2: Ambient-temperature
test.
ISO 8256:1990, Plastics — Determination of tensile-impact strength.
ISO 10350:1993, Plastics — Acquisition and presentation of comparable single-point data.
ISO 11542-1:1994, Plastics — Ultra-high-molecular-weight polyethylene (PE-UHMW) moulding and extrusion
materials — Part 1: Designation system and basis for specifications.
IEC 60093:1980, Methods of test for volume resistivity and surface resistivity of solid electrical insulating materials.
IEC 60112:1979, Method for determining the comparative and the proof tracking indices of solid insulating materials
under moist conditions.
IEC 60243-1:1998, Electrical strength of insulating materials — Test methods — Part 1: Tests at power frequencies.
IEC 60250:1969, Recommended methods for the determination of the permittivity and dielectric dissipation factor of
electrical insulating materials at power, audio and radio frequencies including metre wavelengths.
IEC 60296:1982, Specification for unused mineral insulating oils for transformers and switchgear.

2)
To be published. (Revision of ISO 179:1993)
3)
To be published. (Revision of ISO 1210:1992)
4)
To be published. (Revision of ISO 3146:1985)
©
ISO ISO 11542-2:1998(E)
3  Preparation of test specimens
It is essential that specimens are always prepared by the same procedure using the same conditions. The test
specimens shall be prepared by compression moulding.
3.1  Treatment of the material before moulding
Before processing, no pretreatment of the material sample is normally necessary.
3.2  Compression moulding
Compression-moulded sheets shall be prepared in accordance with ISO 293 using the conditions specified in
table 1. The test specimens for the determination of the properties shall be machined from the compression-
moulded sheets in accordance with ISO 2818 or stamped.
Table 1 — Compression-moulding conditions
Moulding Average Demoulding Full-pressure Preheating Preheating
Material Full pressure
temperature cooling rate temperature time pressure time
°C °C/min °C MPa min MPa min
All grades 210 15 < 40 10 30 5 5 to 15
A type 1 (frame) mould may be used, but it is necessary to start cooling whilst simultaneously applying the full
pressure. This avoids the melt being pressed out of the frame and avoids sink marks.
For thicker sheet (» 4 mm), a type 2 (positive) mould has been found to work satisfactorily. The preheating time
depends on the type of mould and the type of energy input (steam, electricity). For frame moulds, 5 min is usually
sufficient but for positive moulds, due to the bigger mass, a preheating time of 5 min to 15 min can be necessary,
especially if electric heating is used.
4  Conditioning of test specimens
Test specimens shall be conditioned in accordance with ISO 291 for at least 40 h at 23 °C – 2 °C and (50 – 5) %
relative humidity.
5  Determination of properties
In the determination of properties and the presentation of data, the standards, supplementary instructions and notes
given in ISO 10350 shall be applied. All tests shall be carried out in the standard atmosphere of 23 °C – 2 °C and
(50 5) % relative humidity unless specifically stated otherwise in the tables which follow.
–
Table 2 is compiled from ISO 10350, and the properties listed are those which are appropriate to PE-UHMW
moulding and extrusion materials. These properties are those considered useful for comparisons of data generated
for different thermoplastics.
Table 3 contains those properties, not found specifically in table 2, which are in wide use or of particular significance
in the practical characterization of PE-UHMW moulding and extrusion materials.
©
ISO 11542-2:1998(E) ISO
Table 2 — General properties and test conditions (selected from ISO 10350)
Specimen type Test conditions
Property Unit Standard
(dimensions in mm) and supplementary instructions
Mechanical properties
Tensile modulus MPa Test speed 1 mm/min
�
Yield stress MPa Test speed 50 mm/min
�
ISO 527-1,
Yield strain % Test speed 50 mm/min
�
�
ISO 527-2
Nominal strain at break % See ISO 3167 Test speed 50 mm/min
�
ISO 527-4
�
Stress at 50 % strain MPa Test speed 50 mm/min
�
Stress at break MPa Test speed 5 mm/min. Only to be quoted
�
� if strain at break is , 10 %
Strain at break %
Tensile creep modulus MPa  ISO 899-1 See ISO 3167 At 1 h
Strain < 0,5 %
}
At 1 000 h
Flexural modulus MPa ISO 178 80 · 10 · 4 Test speed 2 mm/min
Tensile notched impact kJ/m ISO 8256 80 · 10 · 4
strength double V-notch,
r = 1
Thermal properties
Melting temperature °C ISO 3146 Powder Method C (DSC or DTA). Use 10 °C/min.
Temperature of °C ISO 75-1, 110 · 10 · 4 0,45 MPa and 1,8 MPa
deflection under load ISO 75-2 edgewise
or 80 · 10 · 4
flatwise
–1
Quote the secant value over the
Coefficient of linear °C TMA (see Prepared from Parallel
}
temperature range 23 °C to 55 °C
thermal expansion ISO 10350) ISO 3167 Normal
Flammability mm/min ISO 1210 125 · 13 · 3 Method A — linear burning rate of horizontal
specimens
Ignitability % ISO 4589-1, 80 · 10 · 4 Procedure A — top surface ignition
ISO 4589-2
Electrical properties
Relative permittivity —
Frequency 100 Hz and 1 MHz (compensate
IEC 250 > 80 · > 80 · 1
}
for electrode edge effect)
Dissipation factor —
Volume resistivity W�m
IEC 93 > 80 · > 80 · 1 Voltage 100 V
}
Surface resistivity W
Use 25 mm/75 mm coaxial-cylinder electrode
> 80 · > 80 · 1
Electric strength kV/mm IEC 243-1 configuration. Immerse in IEC 296 transformer
{
> 80 · > 80 · 3
oil. Use short time (rapid rise) test
Comparative tracking — IEC 112 > 15 · > 15 · 4 Use solution A
index
Other properties
Water absorption % ISO 62 50 · 50 · 3 or 24 h immersion in water at 23 °C
˘ 50 · 3 disc
Density kg/m ISO 1183 10 · 10 · 4 Test specimen to be taken from moulded
specimen
©
ISO ISO 11542-2:1998(E)
Table 3 — Additional properties and test conditions of particular utility to PE-UHMW
moulding and extrusion materials
Property Unit Standard Specimen type Test conditions
(dimensions in mm) and supplementary instructions
Mechanical properties
Elongation stress MPa See annex A
Charpy notched impact kJ/m ISO 179-1 See annex B
120 · 15 · 10
strength
double V-notch
14° – 2°
Other properties
Viscosity number ml/g ISO 1628-3 Powder
©
ISO 11542-2:1998(E) ISO
Annex A
(normative)
5)
Method for determining the elongational stress
of PE-UHMW moulding material
A.1  Scope
This annex specifies a method for the determination of the elongational stress a
...