Plastics -- Elasticity index -- Determination of elastic property of melts

This document specifies a procedure for the determination of an elasticity index based on measurements of the shear storage modulus using oscillatory rheometers, establishes general principles, and gives guidelines for performance of measurements. The elasticity index is applicable to all thermoplastics and viscoelastic materials for which the elastic behaviour is a crucial application property.

Plastiques -- Indice d'élasticité -- Détermination de la propriété élastique à l’état fondu

General Information

Status
Published
Publication Date
20-May-2021
Current Stage
5060 - Close of voting Proof returned by Secretariat
Start Date
21-Apr-2021
Completion Date
20-Apr-2021
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INTERNATIONAL ISO
STANDARD 23673
First edition
2021-05
Plastics — Elasticity index —
Determination of elastic property of
melts
Plastiques — Indice d'élasticité — Détermination de la propriété
élastique à l’état fondu
Reference number
ISO 23673:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 23673:2021(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: 2 ----------------------
ISO 23673:2021(E)
Contents Page

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

Introduction ..................................................................................................................................................................................................................................v

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

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

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

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

5 Apparatus ..................................................................................................................................................................................................................... 1

5.1 Measurement apparatus ................................................................................................................................................................. 1

5.2 Temperature-controlled enclosure ....................................................................................................................................... 2

5.3 Temperature measurement and control ........................................................................................................................... 2

5.4 Plate/specimen assembly .............................................................................................................................................................. 2

5.5 Calibration .................................................................................................................................................................................................. 2

6 Sampling ........................................................................................................................................................................................................................ 2

7 Procedure..................................................................................................................................................................................................................... 2

7.1 Test temperature ................................................................................................................................................................................... 2

7.2 Zeroing the gap ....................................................................................................................................................................................... 2

7.3 Introducing the test specimen ................................................................................................................................................... 2

7.4 Conditioning the test specimen ................................................................................................................................................ 2

7.5 Test mode (controlled stress or controlled strain) .................................................................................................. 2

7.6 Determination of thermal stability of sample material ....................................................................................... 3

7.7 Determination of region of linear-viscoelastic behaviour ................................................................................. 3

7.7.1 In the controlled-strain mode............................................................................................................................... 3

7.7.2 In the controlled-stress mode .............................................................................................................................. 3

7.7.3 Confirmation of linear-viscoelastic behaviour ...................................................................................... 3

7.8 Air entrapment........................................................................................................................................................................................ 3

8 Expression of results ........................................................................................................................................................................................ 3

9 Test report ................................................................................................................................................................................................................... 4

Bibliography ................................................................................................................................................................................................................................ 5

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO 23673:2021(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 5, Physical-

chemical properties.

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
---------------------- Page: 4 ----------------------
ISO 23673:2021(E)
Introduction

Many thermoplastic materials show similar viscosities, but elastic properties can vary significantly,

which can lead to inappropriate applications.

The definition of an elasticity index describing the elastic properties of resins in a similar way as the

viscosity is indicated by the melt flow rate opens a possibility to designate the elastic properties using

a simple characteristic number.

Selecting G' at a particular frequency as elasticity index can no longer describe the complete behaviour

of materials with varying frequency. But considering the success MFR/MVR (see ISO 1133-1 and

ISO 1133-2) as characteristic numbers of viscosity the elasticity index provides a similar useful

characteristic number for the elasticity of materials.
© ISO
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 23673
ISO/TC 61/SC 5
Plastics — Elasticity index —
Secretariat: DIN
Determination of elastic property of
Voting begins on:
2021­02­23 melts
Voting terminates on:
2021­04­20
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 23673:2021(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 23673:2021(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
CH­1214 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: 2 ----------------------
ISO/FDIS 23673:2021(E)
Contents Page

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

Introduction ..................................................................................................................................................................................................................................v

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

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

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

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

5 Apparatus ..................................................................................................................................................................................................................... 1

5.1 Measurement apparatus ................................................................................................................................................................. 1

5.2 Temperature­controlled enclosure ....................................................................................................................................... 2

5.3 Temperature measurement and control ........................................................................................................................... 2

5.4 Plate/specimen assembly .............................................................................................................................................................. 2

5.5 Calibration .................................................................................................................................................................................................. 2

6 Sampling ........................................................................................................................................................................................................................ 2

7 Procedure..................................................................................................................................................................................................................... 2

7.1 Test temperature ................................................................................................................................................................................... 2

7.2 Zeroing the gap ....................................................................................................................................................................................... 2

7.3 Introducing the test specimen ................................................................................................................................................... 2

7.4 Conditioning the test specimen ................................................................................................................................................ 2

7.5 Test mode (controlled stress or controlled strain) .................................................................................................. 2

7.6 Determination of thermal stability of sample material ....................................................................................... 3

7.7 Determination of region of linear­viscoelastic behaviour ................................................................................. 3

7.7.1 In the controlled­strain mode............................................................................................................................... 3

7.7.2 In the controlled­stress mode .............................................................................................................................. 3

7.7.3 Confirmation of linear-viscoelastic behaviour ...................................................................................... 3

7.8 Air entrapment........................................................................................................................................................................................ 3

8 Expression of results ........................................................................................................................................................................................ 3

9 Test report ................................................................................................................................................................................................................... 4

Bibliography ................................................................................................................................................................................................................................ 5

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/FDIS 23673:2021(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 non­governmental, 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/d irectives).

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/p atents).

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/f oreword. html.

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

chemical properties.

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
---------------------- Page: 4 ----------------------
ISO/FDIS 23673:2021(E)
Introduction

Many thermoplastic materials show similar viscosities, but elastic properties can vary significantly,

which can lead to inappropriate applications.

The definition of an elasticity index describing the elastic properties of resins in a similar way as the

viscosity is indicated by the melt flow rate opens a possibility to designate the elastic properties using

a simple characteristic number.

Selecting G' at a particular frequency as elasticity index can no longer describe the complete behaviour

of materials with
...

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