prEN ISO 21304-2

SLOVENSKI STANDARD
01-december-2026
Polimerni materiali - Materiali na osnovi polietilena z ultra visoko molsko maso
(PE-UHMW) za oblikovanje in ekstrudiranje - 2. del: Priprava preskušancev in
ugotavljanje lastnosti (ISO/DIS 21304-2:2026)
Plastics - Ultra-high-molecular-weight polyethylene (PE-UHMW) moulding and extrusion
materials - Part 2: Preparation of test specimens and determination of properties
(ISO/DIS 21304-2:2026)
Kunststoffe - Ultrahochmolekulare Polyethylen (PE-UHMW)-Formmassen - Teil 2:
Herstellung von Probekörpern und Bestimmung von Eigenschaften (ISO/DIS 21304-
2:2026)
Plastiques - 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 (ISO/DIS 21304-2:2026)
Ta slovenski standard je istoveten z: prEN ISO 21304-2
ICS:
83.080.20 Plastomeri Thermoplastic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 21304-2
ISO/TC 61/SC 9
Plastics — Ultra-high-molecular-
Secretariat: KATS
weight polyethylene (PE-
Voting begins on:
UHMW) moulding and extrusion
2026-09-30
materials —
Voting terminates on:
2026-12-23
Part 2:
Preparation of test specimens and
determination of properties
Plastiques — 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
ICS: 83.080.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
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POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
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NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 21304-2:2026(en)
DRAFT
ISO/DIS 21304-2:2026(en)
International
Standard
ISO/DIS 21304-2
ISO/TC 61/SC 9
Plastics — Ultra-high-molecular-
Secretariat: KATS
weight polyethylene (PE-
Voting begins on:
UHMW) moulding and extrusion
materials —
Voting terminates on:
Part 2:
Preparation of test specimens and
determination of properties
Plastiques — 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
ICS: 83.080.20
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2026
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
BE CONSIDERED IN THE LIGHT OF THEIR
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
or ISO’s member body in the country of the requester.
NATIONAL REGULATIONS.
ISO copyright office
RECIPIENTS OF THIS DRAFT ARE INVITED
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TO SUBMIT, WITH THEIR COMMENTS,
CH-1214 Vernier, Geneva
NOTIFICATION OF ANY RELEVANT PATENT
Phone: +41 22 749 01 11
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
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Website: www.iso.org
Published in Switzerland Reference number
ISO/DIS 21304-2:2026(en)
ii
ISO/DIS 21304-2:2026(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 3
4 Preparation of test specimens . 3
4.1 Treatment of the material before moulding .3
4.2 Compression moulding.3
5 Conditioning of test specimens . 3
6 Determination of properties . 4
Annex A (normative) Method for determining the melt volume-flow rate of PE-UHMW materials . 7
Annex B (normative) Method for determining the elongational stress of PE-UHMW moulding
materials . 10
Annex C (normative) Method for determining the Charpy double-notched impact strength of
PE-UHMW moulding material .16
Bibliography .21

iii
ISO/DIS 21304-2:2026(en)
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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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.
This second edition cancels and replaces the first edition (ISO 21304-2:2021), which has been technically
revised.
The main changes are as follows:
— Average cooling rate has been replaced by cooling rate in Table 1 according to ISO 293;
— 4 Methods of A, B, C and D have been specified for cutting double-notches in Annex C;
— 2 Types of double-notching devices have been specified in C.3.3;
A list of all parts in the ISO 21304 series can be found on the ISO website.
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.

iv
DRAFT International Standard ISO/DIS 21304-2:2026(en)
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 document specifies the methods of preparation of test specimens and the test methods to be used
for determining the properties of ultra-high-molecular-weight polyethylene (PE-UHMW) moulding and
extrusion materials. It establishes general principles for handling test materials and for conditioning both
the test materials before moulding and the specimens before testing.
This document specifies procedures and conditions for the preparation of test specimens and procedures
for measuring properties of the materials from which these specimens are made. Properties and test
methods which are suitable and necessary to characterize PE-UHMW moulding and extrusion materials are
established.
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
document, as are the designatory properties specified in ISO 21304-1. This document specifies the-materials
with MFR less than 0,1 g/10 min at 190 °C /21,6 kg based on ISO 17855-1.
The methods of preparation and conditioning, the specimen dimensions and the test procedures specified in
this document are used in order to obtain reproducible and comparable test results. 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 documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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 62, Plastics — Determination of water absorption
ISO 75-1, Plastics — Determination of temperature of deflection under load — Part 1: General test method
ISO 75-2, Plastics — Determination of temperature of deflection under load — Part 2: Plastics and ebonite
ISO 178, Plastics — Determination of flexural properties
ISO 179-1, Plastics — Determination of Charpy impact properties — Part 1: Non-instrumented impact test
ISO 291, Plastics — Standard atmospheres for conditioning and testing
ISO 293, Plastics — Compression moulding of test specimens of thermoplastic materials
ISO 527-1, Plastics — Determination of tensile properties — Part 1: General principles
ISO 527-2, Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and extrusion
plastics
ISO/DIS 21304-2:2026(en)
ISO 527-4, Plastics — Determination of tensile properties — Part 4: Test conditions for isotropic and orthotropic
fibre-reinforced plastic composites
ISO 899-1, Plastics — Determination of creep behaviour — Part 1: Tensile creep
ISO 1133-1, Plastics — Determination of the melt mass-flow rate (MFR) and melt volume-flow rate (MVR) of
thermoplastics — Part 1: Standard method
ISO 1183-1, Plastics — Methods for determining the density of non-cellular plastics — Part 1: Immersion method,
liquid pycnometer method and titration method
ISO 1183-2, Plastics — Methods for determining the density of non-cellular plastics — Part 2: Density gradient
column method
ISO 1628-3, Plastics — Determination of the viscosity of polymers in dilute solution using capillary viscometers
— Part 3: Polyethylenes and polypropylenes
ISO 2818, Plastics — Preparation of test specimens by machining
ISO 4589-2, Plastics — Determination of burning behaviour by oxygen index — Part 2: Ambient-temperature
test
ISO 8256, Plastics — Determination of tensile-impact strength
ISO 10350-1, Plastics — Acquisition and presentation of comparable single-point data — Part 1: Moulding
materials
ISO 11357-2, Plastics — Differential scanning calorimetry (DSC) — Part 2: Determination of glass transition
temperature and step height
ISO 11357-3, Plastics — Differential scanning calorimetry (DSC) — Part 3: Determination of temperature and
enthalpy of melting and crystallization
ISO 11359-2, Plastics — Thermomechanical analysis (TMA) — Part 2: Determination of coefficient of linear
thermal expansion and glass transition temperature
ISO 15527, Plastics — Compression-moulded sheets of polyethylene (PE-UHMW, PE-HD) — Requirements and
test methods
ISO 20753, Plastics — Test specimens
ISO 21304-1, Plastics — Ultra-high-molecular-weight polyethylene (PE-UHMW) moulding and extrusion
materials — Part 1: Designation system and basis for specifications
IEC 60112, Method for the determination of the proof and the comparative tracking indices of solid insulating
materials
IEC 60243-1, Electrical strength of insulating materials — Test methods — Part 1: Tests at power frequencies
IEC 60296, Fluids for electrotechnical applications —Mineral insulating oils for electrical equipment
IEC 60695-11-10, Fire hazard testing — Part 11-10: Test flames — 50 W horizontal and vertical flame test
methods
IEC 62631-2-1, Dielectric and resistive properties of solid insulating materials-Part — 2-1:Relative permittivity
and dissipation factor — Technical frequencies (0,1 Hz to 10 MHz)-AC Methods
IEC 62631-3-1, Dielectric and resistive properties of solid insulating materials — Part 3-1: Determination of
resistive properties (DC methods) — Volume resistance and volume resistivity — General method
IEC 62631-3-2, Dielectric and resistive properties of solid insulating materials — Part 3-2: Determination of
resistive properties (DC methods) — Surface resistance and surface resistivity

ISO/DIS 21304-2:2026(en)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
elongational stress
F
(150/10)
tensile stress (force divided by initial cross-sectional area) required to increase the measured length of a
test specimen by 600 % at 150 °C over a 10 min period
Note 1 to entry: It is expressed in megapascals (MPa).
3.2
charpy double-notched impact strength
impact energy absorbed in breaking a double-notched specimen, referred to the original cross-sectional
area of the specimen, at double notches (see Figure C.1 and C.2)
Note 1 to entry: It is expressed in kilojoules per square metre (kJ/m ).
4 Preparation of test specimens
4.1 Treatment of the material before moulding
No pretreatment of the material sample is normally necessary before processing.
4.2 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 or stamped from the
compression-moulded sheets in accordance with ISO 2818.
Table 1 — Compression-moulding conditions
Material Moulding tem- Preheating Preheating Full pres- Full pres- Cooling Demoulding
perature pressure time sure sure time rate temperature
°C MPa min MPa min °C /min °C
All grades 210 5 5 to 15 10 30 ± 1 15 ± 2 ≤ 40
A flash mould (see ISO 293) 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 also avoids sink marks.
For thicker sheet (≥4 mm), a positive mould (see ISO 293) shall be used. 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.
5 Conditioning of test specimens
Unfilled PE-UHMW test specimens shall be conditioned in accordance with ISO 291 for at least 40 h at
23 °C ± 2 °C, with no relative humidity requirement. Test specimens containing fillers and / or additives
that are susceptible to moisture uptake shall be conditioned for at least 40 h at 23 °C ± 2 °C and (50 ± 10 ) %
relative humidity.
ISO/DIS 21304-2:2026(en)
6 Determination of properties
In the determination of properties and the presentation of data, the standards, supplementary instructions
and notes given in ISO 10350-1 shall be applied. Unless specifically stated in Table 2 and Table 3, testing of
unfilled PE-UHMW test specimens shall be carried out at a standard temperature of 23 °C ± 2 °C with no
relative humidity requirement. Specimens made from materials containing fillers and / or additives that
are susceptible to moisture uptake shall be tested in a standard atmosphere of 23 °C ± 2 °C and (50 ± 10 ) %
relative humidity.
Table 2 is compiled from ISO 10350-1, 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.
Table 2 — General properties and test conditions (selected from ISO 10350-1)
Specimen type Specimen
Test conditions and sup-
Property Symbol Standard Unit
(dimensions in Prepa-
plementary instructions
a
mm) ra-tion
1 Mechanical properties
1.1 Tensile modulus E Test speed 1 mm/min
t
MPa
1.2 Yield stress σ Failure with yielding
y
Test speed 50 mm/min
1.3 Yield strain ε
y
%
Nominal strain at
ISO 527-1
1.4 ε
tb
break
ISO 527-2
ISO 20753
Stress at 50 % ISO 527-4 Failure without yielding
1.5 σ
Type A2
strain
ε ≤ 10 %: test speed 5 mm/
MPa
b
min
1.6 Stress at break σ
b
ε > 10 %: test speed
Q
b
1.7 Strain at break ε %
b 50 mm/min
1.8 E 1 At 1 h
Tensile creep tc
ISO 899-1 MPa Strain ≤ 0,5 %
modulus
1.9 E 10 At 1 000 h
tc
1.10 Flexural modulus E ISO 178 80 × 10 × 4 MPa Test speed 2 mm/min
f
80 × 10 × 4
Machined double
Tensile-impact
1.11 α ISO 8256 kJ/m
tN
strength
V-notch,
r = 1
2 Thermal properties
Record peak melting tem-
perature.
Melting tempera-
2.1 T ISO 11357-3
m
ture
Use 10 K/min heating/ cool-
ing rate.
Powder — °C
Record the method used for
Glass transition
determination of T .
2.2 T ISO 11357-2
g
g
temperature
Use 10 K/min heating rate.
ISO/DIS 21304-2:2026(en)
TTabablele 2 2 ((ccoonnttiinnueuedd))
Specimen type Specimen
Test conditions and sup-
Property Symbol Standard Unit
(dimensions in Prepa-
plementary instructions
a
mm) ra-tion
2.3 Temperature of T 1,8 1,8 MPa Use flatwise
f
ISO 75-1
loading
80 × 10 × 4 °C
deflection under
ISO 75-2
2.4 T 0,45 0,45 MPa
f
load
2.5 α Parallel Record the
p
Prepared from
Coefficient of secant value
−1
linear thermal ISO 11359-2 °C over the tem-
ISO 20753 type
2.6 α Transverse
n
expansion perature range
A2
Q
23 °C to 55 °C.
2.7 B50/3 125 × 13 × 3
Record one of the classifica-
Flammabili-
IEC 60695-
tions
ty-Burning behav- —
Additional thick-
11–10
2.8 B50/h
iour
V-0, V-1, V-2, HB, HB40 or HB75.
ness, h
Use procedure A
Ignitability-Oxy-
2.9 OI ISO 4589-2 80 × 10 × 4 %
gen index
(top surface ignition).
b
3 Electrical properties
3.1 ε 100 100 Hz
Relative permit- r
—
tivity
3.2 ε 1M 1 MHz
r Compensate for
IEC 62631-
electrode edge
tan
2–1
3.3 100 Hz
effects.
δ 100
Dissipation factor —
3.4 tan δ 1M 1 MHz
Measure value at
IEC 62631-
3.5 Volume resistivity ρ Ω•m
e ≥ 60 × ≥ 60 × 2
3–1
1 min.
Use contacting line
Voltage
electrodes 1 mm
500 V
to
IEC 62631-
3.6 Surface resistivity σ Ω
e
3–2
Q 2 mm wide, 50 mm
long and 5 mm
apart.
3.7 E 1 ≥ 60 × ≥ 60 × 1 Use 20 mm diameter spheri-
B
cal electrodes.
Immerse in transform-
kV/
Electric strength IEC 60243-1 er oil in accordance with
mm
3.8 E 2 ≥ 60 × ≥ 60 × 2
B
IEC 60296.
Use a voltage application
rate of 2 kV/s.
Comparative
3.9 CTI IEC 60112 ≥ 20 × ≥ 20 × 4 — Use solution A.
tracking index
4 Other properties
Saturation value in wat
...