Plastics - Ultra-high-molecular-weight polyethylene (PE-UHMW) moulding and extrusion materials - Part 2: Preparation of test specimens and determination of properties (ISO 21304-2:2021)

This document 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. It gives the
requirements for handling test material and for conditioning both the test material before moulding
and the specimens before testing.
This document gives the 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 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 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.

Kunststoffe - Ultrahochmolekulare Polyethylen (PE-UHMW)-Formmassen - Teil 2: Herstellung von Probekörpern und Bestimmung von Eigenschaften (ISO 21304-2:2021)

Dieses Dokument legt die Verfahren zur Herstellung von Probekörpern und die zur Bestimmung der Eigenschaften von PE UHMW Formmassen anzuwendenden Prüfverfahren fest. Es enthält die Anforderungen an die Behandlung des Probenmaterials und an das Konditionieren sowohl des Probenmaterials vor der Herstellung als auch der Probekörper vor der Prüfung.
Dieses Dokument enthält die Verfahren und Bedingungen für die Herstellung der Probekörper und Verfahren zur Bestimmung der Eigenschaften der Werkstoffe, aus der die Probekörper hergestellt werden. Eigenschaften und Prüfverfahren, die anwendbar und notwendig sind, um PE UHMW Formmassen zu charakterisieren, sind aufgelistet.
Die Eigenschaften wurden aus den in ISO 10350 1 angegebenen allgemeinen Prüfverfahren ausgewählt. Andere weithin gebräuchliche Prüfverfahren oder solche von besonderer Bedeutung für diese Formmassen sind, wie auch die in ISO 21304 1 festgelegten kennzeichnenden Eigenschaften, ebenfalls in diesem Dokument enthalten. Dieses Dokument legt die Werkstoffe mit einer MFR (Schmelze-Massefließrate, en: melt mass-flow rate) von weniger als 0,1 g/10 min bei 190 °C/21,6 kg nach ISO 17855 1 fest.
Die in diesem Dokument festgelegten Verfahren für die Herstellung und Konditionierung, Probekörpermaße und Prüfverfahren werden angewendet, um reproduzierbare und vergleichbare Prüfergebnisse zu erhalten. Die ermittelten Werte sind nicht notwendigerweise mit denen identisch, die bei Anwendung von Probekörpern anderer Maße oder solchen, die mit einem anderen Verfahren hergestellt wurden, erhalten werden.

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 21304-2:2021)

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 21304-2:2021)

General Information

Status
Published
Technical Committee
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
20-Jan-2021
Completion Date
20-Jan-2021

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SLOVENSKI STANDARD
SIST EN ISO 21304-2:2021
01-marec-2021
Nadomešča:
SIST EN ISO 11542-2:2000
SIST EN ISO 11542-2:2000/AC:2009
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 21304-2:2021)

Plastics - Ultra-high-molecular-weight polyethylene (PE-UHMW) moulding and extrusion

materials - Part 2: Preparation of test specimens and determination of properties (ISO

21304-2:2021)
Kunststoffe - Ultrahochmolekulare Polyethylen (PE-UHMW)-Werkstoffe - Teil 2:
Herstellung von Probekörpern und Bestimmung von Eigenschaften (ISO 21304-2:2021)

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 21304-2:2021)
Ta slovenski standard je istoveten z: EN ISO 21304-2:2021
ICS:
83.080.20 Plastomeri Thermoplastic materials
SIST EN ISO 21304-2:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 21304-2:2021
---------------------- Page: 2 ----------------------
SIST EN ISO 21304-2:2021
EN ISO 21304-2
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2021
EUROPÄISCHE NORM
ICS 83.080.20 Supersedes EN ISO 11542-2:1998
English Version
Plastics - Ultra-high-molecular-weight polyethylene (PE-
UHMW) moulding and extrusion materials - Part 2:
Preparation of test specimens and determination of
properties (ISO 21304-2:2021)

Plastiques - Matériaux à base de polyéthylène à très Kunststoffe - Ultrahochmolekulare Polyethylen (PE-

haute masse moléculaire (PE-UHMW) pour moulage et UHMW)-Werkstoffe - Teil 2: Herstellung von

extrusion - Partie 2: Préparation des éprouvettes et Probekörpern und Bestimmung von Eigenschaften

détermination des propriétés (ISO 21304-2:2021) (ISO 21304-2:2021)
This European Standard was approved by CEN on 9 January 2021.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, 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

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21304-2:2021 E

worldwide for CEN national Members.
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SIST EN ISO 21304-2:2021
EN ISO 21304-2:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 21304-2:2021
EN ISO 21304-2:2021 (E)
European foreword

This document (EN ISO 21304-2:2021) 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 July 2021, and conflicting national standards shall be

withdrawn at the latest by July 2021.

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 11542-2:1998.

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, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 21304-2:2021 has been approved by CEN as EN ISO 21304-2:2021 without any

modification.
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SIST EN ISO 21304-2:2021
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SIST EN ISO 21304-2:2021
INTERNATIONAL ISO
STANDARD 21304-2
First edition
2021-01
Plastics — Ultra-high-molecular-
weight polyethylene (PE-UHMW)
moulding and extrusion materials —
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
Reference number
ISO 21304-2:2021(E)
ISO 2021
---------------------- Page: 7 ----------------------
SIST EN ISO 21304-2:2021
ISO 21304-2:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

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.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 21304-2:2021
ISO 21304-2:2021(E)
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 ............................................................................................................................................................. 4

6 Determination of properties .................................................................................................................................................................... 4

Annex A (normative) Method for determining the melt volume-flow rate of PE-UHMW materials ...8

Annex B (normative) Method for determining the elongational stress of PE-UHMW

moulding materials ........................................................................................................................................................................................11

Annex C (normative) Method for determining the Charpy double-notched impact strength

of PE-UHMW moulding material .......................................................................................................................................................17

Bibliography .............................................................................................................................................................................................................................20

© ISO 2021 – All rights reserved iii
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SIST EN ISO 21304-2:2021
ISO 21304-2:2021(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, in collaboration with the European Committee for Standardization (CEN)

Technical Committee CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation

between ISO and CEN (Vienna Agreement).

This first edition of ISO 21304-2 cancels and replaces ISO 11542-2:1998, which has been technically

revised. It also incorporates the Technical Corrigendum ISO 11542-2:1998/Cor 1:2007.

The main changes compared to the previous edition are as follows:
— updated the normative references to the latest version;
— added terms and definitions (see Clause 3);

— revised the contents and structures of Table 2 and Table 3 according to the revised ISO 10350-1;

— added new Annex A;

— revised the masses of weights used to load specimen in Table B.1 (former Table A.1);

— revised Figure B.1, Figure B.2, Figure B.3 and Figure C.1 (former Figures A.1, A.2, A.3 and B.1).

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 © ISO 2021 – All rights reserved
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SIST EN ISO 21304-2:2021
INTERNATIONAL STANDARD ISO 21304-2:2021(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 document 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. It gives the

requirements for handling test material and for conditioning both the test material before moulding

and the specimens before testing.

This document gives the 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 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 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 2021 – All rights reserved 1
---------------------- Page: 11 ----------------------
SIST EN ISO 21304-2:2021
ISO 21304-2:2021(E)

ISO 527-4, Plastics — Determination of tensile properties — Part 4: Test conditions for isotropic and

orthotropic fibre-reinforced plastics 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 — Unused mineral insulating oils for transformers and

switchgear

ISO/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

2 © ISO 2021 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 21304-2:2021
ISO 21304-2:2021(E)

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

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
elongational stress
(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)
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
Before processing, no pretreatment of the material sample is normally necessary.
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 from

the compression-moulded sheets in accordance with ISO 2818 or stamped.
Table 1 — Compression-moulding conditions
Material Moulding Preheating Preheating Full Full- Average Demoulding
temperature pressure time pressure pressure cooling temperature
time rate
°C MPa min MPa °C
min °C/min
All grades 210 5 5 to 15 10 30 ± 1 15 ≤ 40

A flash mould (see ISO 293) may be used, but it is necessary to start cooling while 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.

© ISO 2021 – All rights reserved 3
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SIST EN ISO 21304-2:2021
ISO 21304-2:2021(E)
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.
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 Prepara-
plementary instructions
mm) tion
1 Mechanical properties
1.1 Tensile modulus E Test speed 1 mm/min
MPa
1.2 Yield stress σ Failure with yielding
1.3 Yield strain ε
Test speed 50 mm/min
Nominal strain at
1.4 ε
ISO 527-1
break
ISO 527-2
ISO 20753
Stress at 50 % Failure without yielding
ISO 527-4
1.5 σ
strain
MPa
Type A2
ε ≤ 10 %: test speed
1.6 Stress at break σ
5 mm/min
ε > 10 %: test speed
1.7 Strain at break ε %
50 mm/min
1.8 E 1 At 1 h
Tensile creep mod-
ISO 899-1 MPa Strain ≤ 0,5 %
ulus 3
1.9 E 10 At 1 000 h
1.10 Flexural modulus E ISO 178 80 × 10 × 4 MPa Test speed 2 mm/min
80 × 10 × 4
Machined dou-
Ten si le -i mpac t
ble
1.11 α ISO 8256 kJ/m
strength
V-notch,
r = 1
Q = Compression moulding.

Electrical properties are generally affected by the relative humidity. Therefore, they shall be measured in a standard

atmosphere of 23 °C ± 2 °C and 50 % ± 10 % relative humidity.
4 © ISO 2021 – All rights reserved
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SIST EN ISO 21304-2:2021
ISO 21304-2:2021(E)
Table 2 (continued)
Specimen type Specimen
Test conditions and sup-
Property Symbol Standard Unit
(dimensions in Prepara-
plementary instructions
mm) tion
2 Thermal properties
Record peak melting tem-
perature.
Melting tempera- ISO 11357-
2.1 T
ture 3
Use 10 K/min heating/
cooling rate.
Powder — °C
Record the method used for
Glass transition
ISO 11357-
determination of T .
2.2 T g
temperature
Use 10 K/min heating rate.
2.3 Temperature of T 1,8 1,8 MPa Use f lat wise
ISO 75-1
loading
80 × 10 × 4 °C
deflection under
2.4 T 0,45 0,45 MPa
ISO 75-2
load
2.5 α Parallel Record the
Prepared from
secant value
Coefficient of linear ISO 11359-
°C over the tem-
ISO 20753 type
thermal expansion 2
2.6 α Transverse
perature range
23 °C to 55 °C.
2.7 B50/3 125 × 13 × 3 Record one of the classi-
F l a m m a b i l i - ISO/
fications
ty-Burning behav- IEC 60695- —
Additional
2.8 B50/h
V-0, V-1, V-2, HB, HB40
iour 11–10
thickness, h
or HB75.
Use procedure A
Ignitability-Oxy-
2.9 OI ISO 4589-2 80 × 10 × 4 %
gen index
(top surface ignition).
Q = Compression moulding.

Electrical properties are generally affected by the relative humidity. Therefore, they shall be measured in a standard

atmosphere of 23 °C ± 2 °C and 50 % ± 10 % relative humidity.
© ISO 2021 – All rights reserved 5
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SIST EN ISO 21304-2:2021
ISO 21304-2:2021(E)
Table 2 (continued)
Specimen type Specimen
Test conditions and sup-
Property Symbol Standard Unit
(dimensions in Prepara-
plementary instructions
mm) tion
3 Electrical properties
3.1 ε 100 100 Hz
Relative permit-
tivity
3.2 ε 1M 1 MHz
Compensate for
IEC 62631-
tan
electrode edge
3.3 100 Hz
2–1
δ 100
effects.
Dissipation factor —
tan
3.4 1 MHz
δ 1M
Measure value at
IEC 62631-
3.5 Volume resistivity ρ Ω•m
3–1
1 min.
≥ 60 × ≥ 60 × 2
Use contacting
line
Volt-
electrodes 1 mm
age
IEC 62631-
500V
3.6 Surface resistivity σ Ω
e Q
3–2
2 mm wide,
50 mm
long and 5 mm
apart.
3.7 E 1 ≥ 60 × ≥ 60 × 1 Use 20 mm diameter spher-
ical electrodes.
Immerse in transform-
IEC 60243- kV/
Electric strength er oil in accordance with
1 mm
3.8 E 2 ≥ 60 × ≥ 60 × 2
IEC 60296.
Use a voltage application
rate of 2 kV/s.
Comparative track-
3.9 CTI IEC 60112 ≥ 20 × ≥ 20 × 4 — Use solution A.
ing index
4 Other properties
Saturation value in water
4.1 W
at 23 °C.
Water absorption ISO 62 60 × 60 × 1 %
Equilibrium value at 23 °C,
4.2 W
H Q
50 % RH.
4.3 ISO 1183-1 10 × 10 × 4
Test specimen to be taken
Density ρ kg/m
from moulded specimen.
4.4 ISO 1183-2 5 × 5 × 4
Q = Compression moulding.

Electrical properties are generally affected by the relative humidity. Therefore, they shall be measured in a standard

atmosphere of 23 °C ± 2 °C and 50 % ± 10 % relative humidity.
6 © ISO 2021 – All rights reserved
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SIST EN ISO 21304-2:2021
ISO 21304-2:2021(E)

Table 3 — Additional properties and test conditions of particular utility to PE-UHMW moulding

and extrusion materials
Test condition
Specimen
Specimen type
and supplemen-
Property Symbol Standard Unit
prepara-
tary
(dimensions in mm)
tion
instructions
1 Rheological properties
MVR (230/21,6
b 3
1.1 Melt Volume-flow rate ISO 21304-2 Powder, granules — cm /10min See Annex A.
2 Mechanical properties
2.1 Elongational stress F ISO 21304-2 Figure B.3 MPa See Annex B.
(150/10)
120 × 15 × 10
Charpy double-notched
2.2 α ISO 21304-2 Double V-notch, kJ/m See Annex C.
impact strength
14° ± 2°
3 Other properties
3.1 Viscosity number I ISO 1628-3 Powder — mL/g —
Abrasion properties - De- Rate of rotation:
3.2 W %
s −1
gree of abrasion 1 200 min
ISO 15527 76,2 × 25,4 × 6,35 Q
Temperature of
Abrasion properties-
3.3 η % slurry: not exceed
Index of abrasion
23 °C
Q = Compression moulding.
See A.1 note.
© ISO 2021 – All rights reserved 7
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SIST EN ISO 21304-2:2021
ISO 21304-2:2021(E)
Annex A
(normative)
Method for determining the melt volume-flow rate of PE-UHMW
materials
A.1 Overview

This annex specifies a method for determining the melt volume-flow rate (MVR) of some PE-UHMW

materials under the test condition of 230 °C /21,6 kg using a triple bore area die (see A.2).

NOTE It has been confirmed that the melt volume-flow rate (MVR) is useful for characterizing some PE-

UHMW materials (e.g. PE-UHMW pipe materials) under the test condition of 230 °C /21,6 kg and bore diameter

of the die with 3,628 mm, although PE-UHMW materials are polyethylene materials having a melt mass-flow rate

(MFR) of less than 0,1 g/10 min, measured at 190 °C / 21,6 kg (see ISO 21304-1).
A.2 Apparatus

Requirements of apparatus shall be in accordance with ISO 1133-1, but use a triple bore area die with

bore diameter 3,628 mm.

NOTE The bore area of the triple bore area die is nearly triple area as big as the bore area of standard die of

ISO 1133-1.
A.3 Test sample

A.3.1 The test sample may be in any form that can be introduced into the bore of the cylinder, e.g.

powder, granules, strips of film or sections of moulded or extruded parts, see ISO 1133-1.

A.3.2 The stabilizer could be mixed homogeneously into the PE-UHMW moulding powder at a

concentration capable of reducing crosslinking. If the PE-UHMW resin or the stabilizer is in granular or

pellet form, grind or pulverize it so that a homogeneous mixture is obtained.

NOTE It has been proved that adding a mass fraction of 0,5 % hindered phenolic antioxidant or phenolic/

phosphite blend of 1/1 is feasible.
A.4 Procedure

A.4.1 Make the apparatus temperature to 230 °C and stabilize it for not less than 15 min.

A.4.2 Weigh the test sample according to MVR field (see Table A.1).
8 © ISO 2021 – All rights reserved
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SIST EN ISO 21304-2:2021
ISO 21304-2:2021(E)
Table A.1 — Guidelines for experimental parameters
MVR Mass of test sample in cylinder Piston move distance
cm /10min g mm
> 0,1, but ≤ 0,15 3 0,5
> 0,15, but ≤ 0,
...

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