EN ISO 6721-2:2019

Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendulum method (ISO 6721-2:2019)

This document specifies two methods (A and B) for determining the linear dynamic mechanical properties of plastics, i.e. the storage and loss components of the torsional modulus, as a function of temperature, for small deformations within the frequency range from 0,1 Hz to 10 Hz.
NOTE       The temperature dependence of these properties, measured over a sufficiently broad range of temperatures (for example from −50 °C to +150 °C for most commercially available plastics), gives information on the transition regions (for example the glass transition and the melting transition) of the polymer. It also provides information concerning the onset of plastic flow.
The two methods described are not applicable to non-symmetrical laminates (see ISO 6721-3). The methods are not suitable for testing rubbers, for which the user is referred to ISO 4664-2.

Kunststoffe - Bestimmung dynamisch-mechanischer Eigenschaften - Teil 2: Torsionspendel-Verfahren (ISO 6721-2:2019)

Dieses Dokument legt zwei Verfahren (A und B) fest, um die linearen dynamisch mechanischen Eigenschaften von Kunststoffen zu bestimmen, und zwar die Speicher  und Verlustkomponenten des Torsionsmoduls als Funktion der Temperatur für kleine Verformungen im Frequenzbereich von 0,1 Hz bis 10 Hz.
ANMERKUNG   Die Temperaturabhängigkeit dieser Größen, ermittelt in einem ausreichend weiten Temperaturbereich (zum Beispiel für die meisten kommerziell erhältlichen Kunststoffe von −50 °C bis +150 °C), liefert Informationen zu den Übergangsbereichen (zum Beispiel für den Übergang „glasartig gummiartig“ oder den Schmelz¬übergang) des Polymers. Außerdem werden Informationen zum Beginn des plastischen Fließens angegeben.
Die beiden beschriebenen Verfahren sind nicht anwendbar auf unsymmetrische Laminate (siehe ISO 6721 3). Die Verfahren sind nicht geeignet zur Prüfung von Elastomeren. Hierzu wird auf ISO 4664 2 verwiesen.

Plastiques - Détermination des propriétés mécaniques dynamiques - Partie 2: Méthode au pendule de torsion (ISO 6721-2:2019)

Le présent document spécifie deux méthodes (A et B) pour la détermination des propriétés mécaniques dynamiques linéaires des plastiques, c'est-à-dire des composantes de conservation et de perte du module en torsion en fonction de la température, pour de petites déformations dans la gamme de fréquences allant de 0,1 Hz à 10 Hz.
NOTE       La dépendance thermique de ces propriétés, mesurée sur une gamme de températures suffisamment large (par exemple de −50 °C à +150 °C pour la plupart des plastiques disponibles dans le commerce), donne des informations sur les zones de transition (par exemple transition vitreuse ou fusion) d'un polymère. Elle donne aussi une information au sujet du début de l'écoulement d'un plastique.
Les deux méthodes décrites ici ne sont pas applicables aux stratifiés asymétriques (voir l'ISO 6721‑3). Ces méthodes ne conviennent pas non plus pour l'essai des caoutchoucs, qui sont traités dans l'ISO 4664‑2.

Polimerni materiali - Ugotavljanje dinamičnih mehanskih lastnosti - 2. del: Metoda s torzijskim nihalom (ISO 6721-2:2019)

Različni deli standarda ISO 6721 določajo metode za določanje dinamičnih mehanskih lastnosti togih polimerov v območju linearnega viskoelastičnega vedenja. Ta dokument določa opredelitve in opisuje splošna načela, vključno z vsemi vidiki, ki so skupni posameznim preskusnim metodam, opisanim v naslednjih delih.
Različni načini deformacije lahko dajo rezultate, ki niso neposredno primerljivi. Natezne vibracije na primer
povzročijo napetost, ki je enakomerna po celotni debelini vzorca, medtem ko na upogibne meritve prednostno vplivajo lastnosti površinskih predelov preskušanca.
Vrednosti, pridobljene z upogibnim preskusom, bodo z vrednostmi, pridobljenimi z nateznim preskusom, primerljive le pri stopnji natezanja, pri čemer je razmerje med napetostjo in deformacijo linearno, in za preskušance, ki imajo homogeno
strukturo.

General Information

• Status: Published
• Publication Date: 28-May-2019
• Withdrawal Date: 29-Nov-2019
• ICS: 83.080.01 - Plastics in general
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249 - Plastics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 29-May-2019
• Completion Date: 29-May-2019
• Ref Project: SIST EN ISO 6721-2:2019 - Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendulum method (ISO 6721-2:2019)

Relations

• Replaces: EN ISO 6721-2:2008 - Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendulum method (ISO 6721-2:2008)
• Effective Date: 23-Jan-2017

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2019
Nadomešča:
SIST EN ISO 6721-2:2008
Polimerni materiali - Ugotavljanje dinamičnih mehanskih lastnosti - 2. del: Metoda
s torzijskim nihalom (ISO 6721-2:2019)
Plastics - Determination of dynamic mechanical properties - Part 2: Torsion-pendulum
method (ISO 6721-2:2019)
Kunststoffe - Bestimmung dynamisch-mechanischer Eigenschaften - Teil 2:
Torsionspendel-Verfahren (ISO 6721-2:2019)
Plastiques - Détermination des propriétés mécaniques dynamiques - Partie 2: Méthode
au pendule de torsion (ISO 6721-2:2019)
Ta slovenski standard je istoveten z: EN ISO 6721-2:2019
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 6721-2
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2019
EUROPÄISCHE NORM
ICS 83.080.01 Supersedes EN ISO 6721-2:2008
English Version
Plastics - Determination of dynamic mechanical properties
- Part 2: Torsion-pendulum method (ISO 6721-2:2019)
Plastiques - Détermination des propriétés mécaniques Kunststoffe - Bestimmung dynamisch-mechanischer
dynamiques - Partie 2: Méthode au pendule de torsion Eigenschaften - Teil 2: Torsionspendel-Verfahren (ISO
(ISO 6721-2:2019) 6721-2:2019)
This European Standard was approved by CEN on 8 June 2018.

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 6721-2:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 6721-2:2019) 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 November 2019, and conflicting national standards
shall be withdrawn at the latest by November 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 6721-2:2008.
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 6721-2:2019 has been approved by CEN as EN ISO 6721-2:2019 without any
modification.
INTERNATIONAL ISO
STANDARD 6721-2
Third edition
2019-04
Plastics — Determination of dynamic
mechanical properties —
Part 2:
Torsion-pendulum method
Plastiques — Détermination des propriétés mécaniques
dynamiques —
Partie 2: Méthode au pendule de torsion
Reference number
ISO 6721-2:2019(E)
©
ISO 2019
ISO 6721-2:2019(E)
© ISO 2019
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
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Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 6721-2:2019(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Test apparatus . 3
5.1 Pendulum . 3
5.2 Inertial element . 3
5.2.1 General. 3
5.2.2 Method A (see Figure 1) . 3
5.2.3 Method B (see Figure 2) . 3
5.3 Clamps . 3
5.4 Oscillation-inducing device . 4
5.5 Oscillation-frequency and oscillation-amplitude recording equipment . 4
5.6 Temperature-controlled chamber . 4
5.7 Gas supply . 4
5.8 Temperature-measurement device . 4
5.9 Devices for measuring test-specimen dimensions . 4
6 Test specimens. 4
6.1 General . 4
6.2 Shape and dimensions . 4
6.3 Preparation . 5
7 Number of specimens . 5
8 Conditioning . 5
9 Procedure. 5
9.1 Test atmosphere . 5
9.2 Measurement of specimen cross-section . 5
9.3 Mounting the test specimens . 5
9.4 Varying the temperature . 5
9.5 Performing the test. 5
10 Expression of results . 6
10.1 Symbols and correction factors . 6
10.2 Calculation of logarithmic decrement, Λ . 7
′
10.3 Calculation of torsional storage modulus, G  . 8
to
″
10.4 Calculation of torsional loss modulus, G  . 8
to
11 Precision . 9
12 Test report . 9
Annex A (normative) Influence of longitudinal force, W .10
Annex B (informative) Damping correction factor, F .11
d
Annex C (informative) Dimensional correction factor, F .12
c
Bibliography .13
ISO 6721-2:2019(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 Internat
...