ISO 2007
(Main)Rubber, unvulcanized — Determination of plasticity — Rapid-plastimeter method
Rubber, unvulcanized — Determination of plasticity — Rapid-plastimeter method
This document specifies a method for the rapid determination of the plasticity of raw rubber and unvulcanized compounded rubber. It is applicable to the determination of the plasticity retention index (PRI) as specified in ISO 2930.
Caoutchouc non vulcanisé — Détermination de la plasticité — Méthode au plastomètre rapide
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Sixth edition
Rubber, unvulcanized —
Determination of plasticity —
Rapid-plastimeter method
Caoutchouc non vulcanisé — Détermination de la plasticité —
Méthode au plastomètre rapide
PROOF/ÉPREUVE
Reference number
© ISO 2025
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
PROOF/ÉPREUVE
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 2
6 Test piece . 5
7 Calibration . 5
8 Temperature of test . 5
9 Procedure . 5
10 Expression of results . 5
11 Precision . 6
12 Test report . 6
Annex A (informative) Precision . 7
Bibliography . 9
PROOF/ÉPREUVE
iii
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 45, Rubber and rubber products, Subcommittee
SC 2, Testing and analysis.
This sixth edition cancels and replaces the fifth edition (ISO 2007:2018), which has been technically revised.
The main changes are as follows:
— revision of subclause 5.3;
— addition of Annex A.
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.
PROOF/ÉPREUVE
iv
International Standard ISO 2007:2025(en)
Rubber, unvulcanized — Determination of plasticity — Rapid-
plastimeter method
WARNING — Persons using this document should be familiar with normal laboratory practice. This
document does not purport to address all of the safety problems, if any, associated with its use. It is
the responsibility of the user to establish appropriate safety and health practices and to determine
the applicability of any regulatory conditions before use.
1 Scope
This document specifies a method for the rapid determination of the plasticity of raw rubber and
unvulcanized compounded rubber. It is applicable to the determination of the plasticity retention index
(PRI) as specified in ISO 2930.
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 1795, Rubber, raw natural and raw synthetic — Sampling and further preparative procedures
ISO 18899, Rubber — Guide to the calibration of test equipment
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
plasticity number
measure of plasticity, based upon the height of a test piece after being subjected to deformation under
specified conditions of compressive force, time and temperature
[SOURCE: ISO 1382:2020, 3.359]
4 Principle
A disc-shaped test piece is compressed rapidly between small parallel platens to a fixed thickness of 1 mm.
The test piece is maintained at this compression for 15 s to enable it to reach approximate temperature
equilibrium with the platens. After this period, the test piece is subjected to a constant compressive force of
100 N ± 1 N for 15 s. Its thickness at the end of this period is taken as the measure of plasticity.
PROOF/ÉPREUVE
5 Apparatus
5.1 Parallel-plate plastimeter, consisting of the following elements:
5.1.1 Two parallel, circular platens, having smooth, flat surfaces, movable in relation to each other,
both provided with suitable means of heating, and a jacket so that the material being tested and the area
surrounding it can be maintained at the specified test temperature.
One of the two platens shall be a right cylinder of stainless steel and shall have one of the following diameters:
a) 7,30 mm (tolerance ±0,02 mm);
b) 10,00 mm (tolerance ±0,02 mm);
c) 14,00 mm (tolerance ±0,02 mm).
The effective depth of the platen shall be 4,50 mm ± 0,15 mm. Care shall be taken to ensure that the edge of
the working face is neither worn nor damaged. The diameter shall be selected so that the measured plasticity
(see Clause 10) lies between 20 and 85. The other platen can be of chromium-plated brass or stainless steel
and shall be of a larger diameter than the first platen. Its effective depth o
...
2025-01-10
ISO/DISPRF 2007:2025(en)
ISO/TC 45/SC 2/WG 2
Secretariat: JISC
Date: 2025-03-20
Rubber, unvulcanized — Determination of plasticity — Rapid-
plastimeter method
Caoutchouc non vulcanisé — Détermination de la plasticité — Méthode au plastomètre rapide
PROOF
ISO/DISPRF 2007:2025(en)
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
EmailE-mail: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO/DISPRF 2007:2025(en)
Contents
Foreword . iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Test piece . 7
7 Calibration . 8
8 Temperature of test . 8
9 Procedure . 8
10 Expression of results . 8
11 Precision . 8
12 Test report . 8
Annex A (informative) Precision . 10
Bibliography . 12
iii
ISO/DISPRF 2007:2025(en)
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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent rights
in respect thereof. As of the date of publication of this document, ISO had not received notice of (a) patent(s)
which may be required to implement this document. However, implementers are cautioned that this may not
represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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 45, Rubber and rubber products, Subcommittee
SC 2, Testing and analysis.
This sixth edition cancels and replaces the fifth edition (ISO 2007:2018), which has been technically revised.
The main changes are as follows:
— — revision of subclause 5.3subclause 5.3;;
— — addition of Annex AAnnex A.
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/DISPRF 2007:2025(en)
Rubber, unvulcanized — Determination of plasticity — Rapid-
plastimeter method
WARNING — Persons using this document should be familiar with normal laboratory practice. This
document does not purport to address all of the safety problems, if any, associated with its use. It is
the responsibility of the user to establish appropriate safety and health practices and to determine the
applicability of any regulatory conditions before use.
1 Scope
This document specifies a method for the rapid determination of the plasticity of raw rubber and unvulcanized
compounded rubber. It is applicable to the determination of the plasticity retention index (PRI) as specified
in ISO 2930.
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 1795, Rubber, raw natural and raw synthetic — Sampling and further preparative procedures
ISO 18899, Rubber — Guide to the calibration of test equipment
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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/obp
— — IEC Electropedia: available at https://www.electropedia.org/
3.1 3.1
plasticity number
measure of plasticity, based upon the height of a test piece after being subjected to deformation under
specified conditions of compressive force, time and temperature
[SOURCE: ISO 1382:2020, 3.359]
4 Principle
A disc-shaped test piece is compressed rapidly between small parallel platens to a fixed thickness of 1 mm.
The test piece is maintained at this compression for 15 s to enable it to reach approximate temperature
equilibrium with the platens. After this period, the test piece is subjected to a constant compressive force of
100 N ± 1 N for 15 s. Its thickness at the end of this period is taken as the measure of plasticity.
5 Apparatus
5.1 5.1 Parallel-plate plastimeter, consisting of the following elements:
ISO/DISPRF 2007:2025(en)
5.1.1 5.1.1 Two parallel, circular platens, having smooth, flat surfaces, movable in relation to each
other, both provided with suitable means of heating, and a jacket so that the material being tested and the area
surrounding it can be maintained at the specified test temperature.
One of the two platens shall be a right cylinder of stainless steel and shall have one of the following diameters:
a) a) 7,30 mm (tolerance ±0,02 mm);
b) b) 10,00 mm (tolerance ±0,02 mm); or
c) c) 14,00 mm (tolerance ±0,02 mm).
The effective depth of the platen shall be 4,50 mm ± 0,15 mm. Care shall be taken to ensure that the edge of
the working face is neither worn nor damaged. The diameter shall be selected so that the measured plasticity
(see Clause 10Clause 10)) lies between 20 and 85. The other platen can be of chromium-plated brass or
stainless steel and shall be of a larger diameter than the first platen. Its effective depth of inclusion within any
heating jacket shall be 3,50 mm ± 0,25 mm. Figure 1Figure 1 is a schematic diagram of the platens.
ISO/DISPRF 2007:2025(en)
Dimensions in millimetres
ISO/DISPRF 2007:2025(en)
Key
1, 3 heaters
2, 4 temperature sensors
a
A Upper platen.
b
B Lower platen.
Figure 1 — Schematic diagram of parallel-plate plastimeter
5.1.2 5.1.2 Means for moving one or other of the two platens normal to its surface, to compress the
test piece to a thickness of 1,00 mm ± 0,01 mm. The mode of movement of the platen and th
...
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