Rheology - Part 1: Vocabulary and symbols for rotational and oscillatory rheometry (ISO 3219-1:2021)

This document specifies general terms and definitions that are used in the context of rotational and
oscillatory rheometry.
Further terms and definitions can be found in the other parts of the ISO 3219 series where they are
used.

Rheologie - Teil 1: Begriffe und Formelzeichen für die Rotations- und Oszillationsrheometrie (ISO 3219-1:2021)

Dieses Dokument legt allgemeine Begriffe fest, die im Bereich der Rotations- und Oszillationsrheometrie verwendet werden.
Weitere Begriffe sind in den weiteren Teilen der Normenreihe ISO 3219 zu finden, in denen sie verwendet werden.

Rhéologie - Partie 1: ocabulaire et symboles pour la rhéométrie rotative et oscillatoire (ISO 3219-1:2021)

Reologija - 1. del: Izrazi in simboli za rotacijsko in oscilacijsko reometrijo (ISO 3219-1:2021)

General Information

Status
Published
Public Enquiry End Date
03-May-2020
Publication Date
14-Jun-2021
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
07-Jun-2021
Due Date
12-Aug-2021
Completion Date
15-Jun-2021

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SLOVENSKI STANDARD
SIST EN ISO 3219-1:2021
01-julij-2021
Nadomešča:
SIST EN ISO 3219:1997

Reologija - 1. del: Izrazi in simboli za rotacijsko in oscilacijsko reometrijo (ISO

3219-1:2021)

Rheology - Part 1: Vocabulary and symbols for rotational and oscillatory rheometry (ISO

3219-1:2021)
Rheologie - Teil 1: Begriffe und Formelzeichen für die Rotations- und
Oszillationsrheometrie (ISO 3219-1:2021)

Rhéologie - Partie 1: ocabulaire et symboles pour la rhéométrie rotative et oscillatoire

(ISO 3219-1:2021)
Ta slovenski standard je istoveten z: EN ISO 3219-1:2021
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
SIST EN ISO 3219-1:2021 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 3219-1:2021
---------------------- Page: 2 ----------------------
SIST EN ISO 3219-1:2021
EN ISO 3219-1
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2021
EUROPÄISCHE NORM
ICS 83.080.01 Supersedes EN ISO 3219:1994
English Version
Rheology - Part 1: Vocabulary and symbols for rotational
and oscillatory rheometry (ISO 3219-1:2021)

Rhéologie - Partie 1: ocabulaire et symboles pour la Rheologie - Teil 1: Begriffe und Formelzeichen für die

rhéométrie rotative et oscillatoire (ISO 3219-1:2021) Rotations- und Oszillationsrheometrie (ISO 3219-

1:2021)
This European Standard was approved by CEN on 29 October 2020.

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 3219-1:2021 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 3219-1:2021
EN ISO 3219-1:2021 (E)
Contents Page

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

---------------------- Page: 4 ----------------------
SIST EN ISO 3219-1:2021
EN ISO 3219-1:2021 (E)
European foreword

This document (EN ISO 3219-1:2021) has been prepared by Technical Committee ISO/TC 35 "Paints

and varnishes" in collaboration with Technical Committee CEN/TC 139 “Paints and varnishes” the

secretariat of which is held by DIN.

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 2021, and conflicting national standards

shall be withdrawn at the latest by November 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 3219:1994.

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 3219-1:2021 has been approved by CEN as EN ISO 3219-1:2021 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 3219-1:2021
---------------------- Page: 6 ----------------------
SIST EN ISO 3219-1:2021
INTERNATIONAL ISO
STANDARD 3219-1
First edition
2021-05
Rheology —
Part 1:
Vocabulary and symbols for rotational
and oscillatory rheometry
Rhéologie —
Partie 1: Vocabulaire et symboles pour la rhéométrie rotative et
oscillatoire
Reference number
ISO 3219-1:2021(E)
ISO 2021
---------------------- Page: 7 ----------------------
SIST EN ISO 3219-1:2021
ISO 3219-1:2021(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 3219-1:2021
ISO 3219-1:2021(E)
Contents Page

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

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

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

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

4 Symbols .......................................................................................................................................................................................................................... 8

Alphabetical index .............................................................................................................................................................................................................10

© ISO 2021 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 3219-1:2021
ISO 3219-1:2021(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 35, Paints and varnishes, Subcommittee

SC 9, General test methods for paints and varnishes, in collaboration with the European Committee for

Standardization (CEN) Technical Committee CEN/TC 139, Paints and varnishes, in accordance with the

Agreement on technical cooperation between ISO and CEN (Vienna Agreement), and in cooperation

with ISO/TC 61, Plastics, Subcommittee SC 5, Physical-chemical properties.

This first edition cancels and replaces the second edition (ISO 3219:1993), which has been technically

revised.
The main changes compared to the previous edition are as follows:

— the terms and definitions have been moved to ISO 3219-1, the general principles have been moved

to ISO 3219-2;
— new terms and definitions have been added;
— Table 1 on symbols has been added.
A list of all parts in the ISO 3219 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
---------------------- Page: 10 ----------------------
SIST EN ISO 3219-1:2021
INTERNATIONAL STANDARD ISO 3219-1:2021(E)
Rheology —
Part 1:
Vocabulary and symbols for rotational and oscillatory
rheometry
1 Scope

This document specifies general terms and definitions that are used in the context of rotational and

oscillatory rheometry.

Further terms and definitions can be found in the other parts of the ISO 3219 series where they are

used.
2 Normative references
There are no normative references in this document.
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:

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at https:// www .iso .org/ obp
3.1
absolute value of the complex shear modulus
|G*|

ratio of the amplitude of the shear stress τ (3.41) and the amplitude of the shear strain γ (3.40)

0 0

Note 1 to entry: The absolute value of the complex shear modulus |G*| has the unit pascal (Pa).

3.2
absolute value of the complex shear viscosity
|η*|

ratio of the amount of the complex shear modulus |G*| (3.1) and the angular frequency ω (3.5)

Note 1 to entry: The absolute value of the complex shear viscosity |η*| has the unit pascal multiplied by seconds

(Pa⋅s).
3.3
amplitude sweep
oscillatory test with variable amplitude at a constant angular frequency ω (3.5)
3.4
angular displacement
angular deflection
angular measure where the angle is indicated by the length of the arc
Note 1 to entry: The angular displacement has the unit radians (rad).
© ISO 2021 – All rights reserved 1
---------------------- Page: 11 ----------------------
SIST EN ISO 3219-1:2021
ISO 3219-1:2021(E)
3.5
angular frequency
temporal change of the angular displacement φ (3.4) in oscillation

Note 1 to entry: The angular frequency ω has the unit radians per second (rad⋅s ) or, since rad is dimensionless

(i.e. metre divided by metre), the unit reciprocal seconds (s ).

Note 2 to entry: The angular frequency ω, in reciprocal seconds (s ), is linked to the frequency f, in hertz (Hz) or

in reciprocal seconds (s ), via the following relation:
ωπ=⋅2 f
3.6
angular velocity
temporal change of the angular displacement φ (3.4) in rotation

Note 1 to entry: The angular velocity Ω has the unit radians per second (rad⋅s ).

Note 2 to entry: The angular velocity Ω, in radians per second (rad⋅s ), is linked to rotational speed n, in

reciprocal seconds (s ), via the following relation:
Ω=⋅2π n
3.7
continuous ramp

type of test where the specified variable from the initial value to the final value varies monotonously

and constantly during the test

Note 1 to entry: The continuous ramp is performed by linear or logarithmic presetting.

Note 2 to entry: An alternative to the continuous ramp is the step ramp (3.46).
3.8
elastic behaviour
elasticity

property of a material to show reversible deformation and storage of mechanical energy

3.9
flow curve

graphical representation of the relation between shear stress τ (3.41) and shear rate γ (3.38)

3.10
frequency
oscillation per unit of time

Note 1 to entry: The frequency f has the unit hertz (Hz), where 1 Hz is 1 oscillation per second.

Note 2 to entry: The frequency f, in hertz (Hz) or in reciprocal seconds (s ), is linked to the angular frequency ω

(3.5) in reciprocal seconds (s ) via the following formula:
f=
3.11
frequency sweep

oscillatory test (3.24) with variable angular frequency ω (3.5) at a constant amplitude

2 © ISO 2021 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 3219-1:2021
ISO 3219
...

SLOVENSKI STANDARD
oSIST prEN ISO 3219-1:2020
01-april-2020

Reologija - 1. del: Splošni izrazi in definicije za rotacijsko in oscilacijsko reometrijo

(ISO/DIS 3219-1:2020)

Rheology - Part 1: General terms and definitions for rotational and oscillatory rheometry

(ISO/DIS 3219-1:2020)

Rheologie - Teil 1: Allgemeine Begriffe der Rotations- und Oszillationsrheometrie

(ISO/DIS 3219-1:2020)

Rhéologie Partie 1: Termes généraux et définitions pour la rhéométrie rotative et

oscillatoire (ISO/DIS 3219-1:2020)
Ta slovenski standard je istoveten z: prEN ISO 3219-1
ICS:
83.080.01 Polimerni materiali na Plastics in general
splošno
oSIST prEN ISO 3219-1:2020 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN ISO 3219-1:2020
---------------------- Page: 2 ----------------------
oSIST prEN ISO 3219-1:2020
DRAFT INTERNATIONAL STANDARD
ISO/DIS 3219-1
ISO/TC 35/SC 9 Secretariat: BSI
Voting begins on: Voting terminates on:
2020-01-20 2020-04-13
Rheology —
Part 1:
General terms and definitions for rotational and
oscillatory rheometry
Réologie —

Partie 1: Termes et définitions générales pour rhéométrie rotational et oscillatoire

ICS: 83.080.01
Member bodies are requested to consult relevant national interests in ISO/TC
61/SC 5 before casting their ballot to the e-Balloting application.
THIS DOCUMENT IS A DRAFT CIRCULATED
This document is circulated as received from the committee secretariat.
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
ISO/CEN PARALLEL PROCESSING
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 3219-1:2020(E)
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 SUPPORTING DOCUMENTATION. ISO 2020
---------------------- Page: 3 ----------------------
oSIST prEN ISO 3219-1:2020
ISO/DIS 3219-1:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

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
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 3219-1:2020
ISO/DIS 3219-1:2020(E)
Contents Page

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

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

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

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

4 Symbols and units ............................................................................................................................................................................................... 8

(informative) Alphabetical index .........................................................................................................................................................................10

© ISO 2020 – All rights reserved iii
---------------------- Page: 5 ----------------------
oSIST prEN ISO 3219-1:2020
ISO/DIS 3219-1:2020(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 35, Paints and varnishes, Subcommittee

SC 9, Generaltest methods for paints and varnishes, in cooperation with ISO/TC 61, Plastics, Subcommittee

SC 5, Physical chemical properties.
A list of all parts in the ISO 3219 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 2020 – All rights reserved
---------------------- Page: 6 ----------------------
oSIST prEN ISO 3219-1:2020
DRAFT INTERNATIONAL STANDARD ISO/DIS 3219-1:2020(E)
Rheology —
Part 1:
General terms and definitions for rotational and
oscillatory rheometry
1 Scope

This document specifies general terms and definitions that are used in the context of rotational and

oscillatory rheometry.

Other terms and definitions can be found in the other parts of the standards series where they are used.

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.

There are no normative references in this document.
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:

— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online browsing platform: available at http:// www .iso .org/ obp
3.1
absolute value of the complex shear modulus
|G*|

ratio of the amplitude of the shear stress τ and the amplitude of the shear strain γ

0 0

Note 1 to entry: The absolute value of the complex shear modulus |G*| has the unit pascal (Pa).

3.2
absolute value of the complex shear viscosity
|η*|

ratio of the amount of the complex shear modulus |G*| and the angular frequency ω

Note 1 to entry: The absolute value of the complex shear viscosity |η*| has the unit pascal multiplied by

seconds (Pa⋅s).
3.3
amplitude sweep
oscillatory test with variable amplitude at a constant angular frequency ω
© ISO 2020 – All rights reserved 1
---------------------- Page: 7 ----------------------
oSIST prEN ISO 3219-1:2020
ISO/DIS 3219-1:2020(E)
3.4
angular displacement
angular measure where the angle is indicated by the length of the arc
Note 1 to entry: The angular displacement has the unit radians (rad).
3.5
angular frequency
product of full circle angle 2π and frequency f

Note 1 to entry: The angular frequency has the unit radians per second (rad⋅s ), which is the SI unit, or reciprocal

seconds (s ), which also is very common.
3.6
angular velocity
temporal change of the angular displacement Φ

Note 1 to entry: The angular velocity Ω has the unit radians per second (rad⋅s ), the angular displacement Φ has

unit radian (rad).

Note 2 to entry: The angular velocity Ω, in radians per second (rad⋅s ), is linked to rotational speed n, in reciprocal

seconds (s ), via the following relation:
Ω=2π⋅n
3.7
continuous ramp

type of test where the specified variable from the initial value to the final value varies monotonously

and constantly during the test

Note 1 to entry: The continuous ramp is performed by linear or logarithmic presetting.

Note 2 to entry: The alternative to the continuous ramp is the step ramp.
3.8
elastic behaviour
elasticity
property of a material to show reversible deformation and storage of energy
3.9
flow curve

graphical representation of the relation between shear stress τ and shear rate γ

3.10
frequency
oscillation per unit of time

Note 1 to entry: The frequency f has the unit hertz (Hz), where: 1 Hz is 1 oscillation per second.

Note 2 to entry: The frequency f, in hertz (Hz), is linked to the angular frequency ω via the following relation:

f =
3.11
frequency sweep
oscillatory test with variable angular frequency ω at a constant amplitude
2 © ISO 2020 – All rights reserved
---------------------- Page: 8 ----------------------
oSIST prEN ISO 3219-1:2020
ISO/DIS 3219-1:2020(E)
3.12
ideal-elastic behaviour
Hookean behaviour

property of a material to show an immediate, fully reversible recovery after deformation

3.13
in-phase component of the complex shear viscosity
dynamic viscosity
real part of the complex shear viscosityη*

Note 1 to entry: The dynamic viscosity η‘ has the unit pascal multiplied by seconds (Pa⋅s).

3.14
kinematic viscosity
ratio of shear viscosity η and density ρ
2 -1

Note 1 to entry: The kinematic viscosity υ has the unit square metres per second (m ⋅s ).

3.15
laminar flow
flow where infinitesimally thin layers are moved in parallel to each other

Note 1 to entry: All calculations of rheological parameters for absolute measuring geometries (see ISO 3219-2)

only apply on the assumption of laminar flow.
3.16
linear viscoelastic range (LVR)
range where the shear strain γ is proportional to the shear stress τ
3.17
linearity limit
[τ , γ ]
L L

point on the curve τ(γ) or γ(τ), above which the ratio of shear stress τ and shear strain γ is not anymore

constant

Note 1 to entry: The linearity limit is given as shear stress τ with the unit pascal (Pa) and as shear strain γ with

L L
the unit 1.
3.18
loss angle
phase angle

phase shift between shear stress τ and shear strain γ at a harmonic steady-state excitation

Note 1 to entry: The loss angle δ has the unit degrees (°) or radians (rad).
3.19
loss factor
damping factor
tan δ
ratio of shear loss modulus G'' and shear storage modulus G'
Note 1 to entry: The loss factor tan δ has the unit 1.
3.20
Newtonian flow behaviour
ideal-viscous flow behaviour

behaviour where the shear viscosityη is independent of shear rate γ , shear stress τ and time t

© ISO 2020 – All rights reserved 3
---------------------- Page: 9 ----------------------
oSIST prEN ISO 3219-1:2020
ISO/D
...

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