Plastics — Determination of dynamic mechanical properties — Part 12: Compressive vibration — Non-resonance method

This document describes a compressive vibration, non-resonance method for determining the components of the compressive complex modulus E* of polymers at frequencies typically in the range 0,01 Hz to 100 Hz. The method is applicable for measuring dynamic storage moduli of semi-rigid polymers in the range 1 MPa to 1 GPa. This method is particularly suited to the measurements of dynamic moduli and loss factors of semi‑rigid plastics in the shape of a right-angled prism, cylinder or tube and can be conveniently used to study the variation of dynamic properties with temperature and frequency through most of the glass‑rubber relaxation region (see ISO 6721-1).

Plastiques — Détermination des propriétés mécaniques dynamiques — Partie 12: Vibration en compression — Méthode hors résonance

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Published
Publication Date
22-Feb-2022
Current Stage
5060 - Close of voting Proof returned by Secretariat
Completion Date
12-Jan-2022
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INTERNATIONAL ISO
STANDARD 6721-12
Second edition
2022-02
Plastics — Determination of dynamic
mechanical properties —
Part 12:
Compressive vibration — Non-
resonance method
Plastiques — Détermination des propriétés mécaniques
dynamiques —
Partie 12: Vibration en compression — Méthode hors résonance
Reference number
ISO 6721-12:2022(E)
© ISO 2022
---------------------- Page: 1 ----------------------
ISO 6721-12:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

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
© ISO 2022 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 6721-12:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Test device .................................................................................................................................................................................................................. 2

5.1 Loading assembly ................................................................................................................................................................................. 2

5.1.1 General ........................................................................................................................................................................................ 2

5.1.2 Compression plates .......................................................................................................................................................... 3

5.1.3 Transducers ............................................................................................................................................................................ 3

5.2 Electronic data-processing equipment ............................................................................................................................. 4

5.3 Temperature measurement and control .......................................................................................................................... 4

5.4 Devices for measuring test specimen dimensions ................................................................................................. 4

6 Test specimens ....................................................................................................................................................................................................... 4

6.1 Shape and dimensions ..................................................................................................................................................................... 4

6.2 Preparation ................................................................................................................................................................................................ 4

7 Number of test specimens .......................................................................................................................................................................... 5

8 Conditioning ............................................................................................................................................................................................................. 5

9 Procedure ....................................................................................................................................................................................................................5

9.1 Test atmosphere .................................................................................................................................................................................... 5

9.2 Measuring the dimensions of and mounting the test specimen ................................................................. 5

9.3 Varying the temperature ............................................................................................................................................................... 5

9.4 Performing the test............................................................................................................................................................................. 5

10 Expression of results ....................................................................................................................................................................................... 6

10.1 Calculation of the compressive storage modulus E′.............................................................................................. 6

10.2 Loss factor tan δ .................................................................................................................................................................................... 6

10.3 Compressive loss modulus E′′ ................................................................................................................................................... 6

10.4 Presentation of data as a function of temperature ................................................................................................ 6

11 Precision ....................................................................................................................................................................................................................... 7

12 Test report .................................................................................................................................................................................................................. 7

Bibliography ................................................................................................................................................................................................................................ 8

iii
© ISO 2022 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 6721-12:2022(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 5, Physical-

chemical properties.

This second edition cancels and replaces the first edition (ISO 6721-12:2009), which has been technically

revised.
The main changes are as follows:
— NOTE 1and NOTE 2 in Clause 1 have been removed;
— the normative references have been updated;

— the description for alternate loading assemblies has been added and the accuracy specification for

apparatus has been updated;

— the preferred test specimen sizes have been removed and the requirement for the ratio of thickness/

width of the specimen has been added;
— the document has been revised editorially.
A list of all parts in the ISO 6721 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.
© ISO 2022 – All rights reserved
---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 6721-12:2022(E)
Plastics — Determination of dynamic mechanical
properties —
Part 12:
Compressive vibration — Non-resonance method
1 Scope

This document describes a compressive vibration, non-resonance method for determining the

components of the compressive complex modulus E* of polymers at frequencies typically in the range

0,01 Hz to 100 Hz. The method is applicable for measuring dynamic storage moduli of semi-rigid

polymers in the range 1 MPa to 1 GPa.

This method is particularly suited to the measurements of dynamic moduli and loss factors of semi-rigid

plastics in the shape of a right-angled prism, cylinder or tube and can be conveniently used to study

the variation of dynamic properties with temperature and frequency through most of the glass-rubber

relaxation region (see ISO 6721-1).
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 6721-1, Plastics — Determination of dynamic mechanical properties — Part 1: General principles

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 6721-1 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/o bp
— IEC Electropedia: available at https:// www.e lectropedia. org/
4 Principle

The specimen is subjected to a sinusoidal compressive force or deformation at a frequency significantly

below the fundamental resonance frequency for the clamped/free longitudinal mode. The amplitudes

of the force and displacement cycles applied to the specimen and the phase angle between these cycles

are measured. The storage and loss components of the compressive complex modulus and the loss

factor are calculated.
© ISO 2022 – All rights reserved
---------------------- Page: 5 ----------------------
ISO 6721-12:2022(E)
5 Test device
5.1 Loading assembly
5.1.1 General

The requirements on the apparatus are that it shall permit measurements of the amplitudes of, and

the phase angle between, the force and displacement cycles for a specimen subjected to a sinusoidal

compressive force or deformation. Various designs of apparatus are possible; an example of a suitable

version is shown schematically in Figure 1. A sinusoidal force is generated by the vibrator V and applied

to one end of the specimen S by means of the compression plate C . The amplitude and freq

...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 6721-12
ISO/TC 61/SC 5
Plastics — Determination of dynamic
Secretariat: DIN
mechanical properties —
Voting begins on:
2021-11-16
Part 12:
Voting terminates on:
Compressive vibration — Non-
2022-01-11
resonance method
Plastiques — Détermination des propriétés mécaniques
dynamiques —
Partie 12: Vibration en compression — Méthode hors résonance
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 6721-12:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2021
---------------------- Page: 1 ----------------------
ISO/FDIS 6721-12:2021(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
© ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 6721-12:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Test device .................................................................................................................................................................................................................. 2

5.1 Loading assembly ................................................................................................................................................................................. 2

5.1.1 General ........................................................................................................................................................................................ 2

5.1.2 Compression plates .......................................................................................................................................................... 3

5.1.3 Transducers ............................................................................................................................................................................ 3

5.2 Electronic data-processing equipment ............................................................................................................................. 4

5.3 Temperature measurement and control .......................................................................................................................... 4

5.4 Devices for measuring test specimen dimensions ................................................................................................. 4

6 Test specimens ....................................................................................................................................................................................................... 4

6.1 Shape and dimensions ..................................................................................................................................................................... 4

6.2 Preparation ................................................................................................................................................................................................ 4

7 Number of test specimens .......................................................................................................................................................................... 5

8 Conditioning ............................................................................................................................................................................................................. 5

9 Procedure ....................................................................................................................................................................................................................5

9.1 Test atmosphere .................................................................................................................................................................................... 5

9.2 Measuring the dimensions of and mounting the test specimen ................................................................. 5

9.3 Varying the temperature ............................................................................................................................................................... 5

9.4 Performing the test............................................................................................................................................................................. 5

10 Expression of results ....................................................................................................................................................................................... 6

10.1 Calculation of the compressive storage modulus E′.............................................................................................. 6

10.2 Loss factor tan δ .................................................................................................................................................................................... 6

10.3 Compressive loss modulus E′′ ................................................................................................................................................... 6

10.4 Presentation of data as a function of temperature ................................................................................................ 6

11 Precision ....................................................................................................................................................................................................................... 7

12 Test report .................................................................................................................................................................................................................. 7

Bibliography ................................................................................................................................................................................................................................ 8

iii
© ISO 2021 – All rights reserved
---------------------- Page: 3 ----------------------
ISO/FDIS 6721-12:2021(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 on 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 the following

URL: www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical-

chemical properties.

This second edition cancels and replaces the first edition (ISO 6721-12:2009), which has been technically

revised.
The main changes compared to the previous edition are as follows:
— NOTE 1and NOTE 2 in Clause 1 have been removed;
— the normative references have been updated;

— the description for alternate loading assemblies has been added and the accuracy specification for

apparatus has been updated;

— the preferred test specimen sizes have been removed and the requirement for the ratio of thickness/

width of the specimen has been added;
— the document has been revised editorially.
A list of all parts in the ISO 6721 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.
© ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 6721-12:2021(E)
Plastics — Determination of dynamic mechanical
properties —
Part 12:
Compressive vibration — Non-resonance method
1 Scope

This document describes a compressive vibration, non-resonance method for determining the

components of the compressive complex modulus E* of polymers at frequencies typically in the range

0,01 Hz to 100 Hz. The method is applicable for measuring dynamic storage moduli of semi-rigid

polymers in the range 1 MPa to 1 GPa

This method is particularly suited to the measurements of dynamic moduli and loss factors of semi-rigid

plastics in the shape of a right-angled prism, cylinder or tube and can be conveniently used to study

the variation of dynamic properties with temperature and frequency through most of the glass-rubber

relaxation region (see ISO 6721-1).
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 6721-1, Plastics — Determination of dynamic mechanical properties — Part 1: General principles

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 6721-1 apply.

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

— IEC Electropedia: available at https:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
4 Principle

The specimen is subjected to a sinusoidal compressive force or deformation at a frequency significantly

below the fundamental resonance frequency for the clamped/free longitudinal mode. The amplitudes

of the force and displacement cycles applied to the specimen and the phase angle between these cycles

are measured. The storage and loss components of the compressive complex modulus and the loss

factor are calculated.
© ISO 2021 – All rights reserved
---------------------- Page: 5 ----------------------
ISO/FDIS 6721-12:2021(E)
5 Test device
5.1 Loading assembly
5.1.1 General

The requirements on the apparatus are that it shall permit measurements of the amplitudes of, and

the phase angle between, the force and displacement cycles for a specimen subjected to a sinusoidal

...

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