ISO 12493:2017

Rubber, vulcanized — Determination of stress in tension upon heating

ISO 12493:2017 specifies a method for measuring the stress in tension which is developed in vulcanized rubber when it is heated (thermal stress). The thermal stress is measured for various pre-strain and temperature conditions as a function of time.

Caoutchouc vulcanisé — Détermination de la contrainte en traction lors du chauffage

General Information

• Status: Withdrawn
• Publication Date: 30-Jul-2017
• ICS: 83.060 - Rubber
• Technical Committee: ISO/TC 45/SC 2 - Testing and analysis
• Drafting Committee: ISO/TC 45/SC 2/WG 2 - Visco-elastic properties
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 06-Jan-2023

Relations

• Revised: ISO 12493:2023 - Rubber, vulcanized or thermoplastic — Determination of stress in tension under non-isothermal conditions
• Effective Date: 23-Apr-2020
• Revises: ISO 12493:2011 - Rubber, vulcanized — Determination of stress in tension upon heating
• Effective Date: 10-Dec-2016

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 12493
Second edition
2017-07
Rubber, vulcanized — Determination
of stress in tension upon heating
Caoutchouc vulcanisé — Détermination de la contrainte en traction
lors du chauffage
Reference number
ISO 12493:2017(E)
ISO 2017
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ISO 12493:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

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ii © ISO 2017 – All rights reserved
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ISO 12493:2017(E)
Contents Page

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

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

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

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

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

4 Principle ........................................................................................................................................................................................................................ 2

5 Apparatus ..................................................................................................................................................................................................................... 2

5.1 Thermal-stress testing machine .............................................................................................................................................. 2

5.2 Temperature-controlled chamber .......................................................................................................................................... 3

5.3 Thickness- and width-measuring devices ....................................................................................................................... 3

6 Calibration .................................................................................................................................................................................................................. 3

7 Test piece ...................................................................................................................................................................................................................... 4

7.1 Dimensions ................................................................................................................................................................................................. 4

7.2 Number of test pieces ....................................................................................................................................................................... 4

7.3 Time lapse between moulding and testing ..................................................................................................................... 4

7.4 Conditioning .............................................................................................................................................................................................. 4

8 Test conditions ....................................................................................................................................................................................................... 4

8.1 Temperature .............................................................................................................................................................................................. 4

8.2 Pre-strain ..................................................................................................................................................................................................... 5

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

10 Expression of results ........................................................................................................................................................................................ 5

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

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

Annex A (normative) Calibration schedule ................................................................................................................................................... 9

Bibliography .............................................................................................................................................................................................................................11

© ISO 2017 – All rights reserved iii
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ISO 12493:2017(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

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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

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URL: w w w . i s o .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 second edition cancels and replaces the first edition (ISO 12493:2011), of which it constitutes a

minor revision to update the normative references in Clause 2.
iv © ISO 2017 – All rights reserved
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ISO 12493:2017(E)
Introduction

Vulcanized rubber held under a constant stress will contract as the test temperature is raised, while

a test piece held under a constant strain will develop an increased stress. These are features of the

Gough-Joule effect in rubber and, unless they are taken into account at the design stage, any resulting

changes in forces and dimensions can affect the performance of some products, such as rotary seals,

used at high temperatures and high strains (see Reference [1]).

This document describes a test method for the determination of the change in tensile stress that results

from an increase in test temperature.
© ISO 2017 – All rights reserved v
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INTERNATIONAL STANDARD ISO 12493:2017(E)
Rubber, vulcanized — Determination of stress in tension
upon heating

WARNING 1 — 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

ensure compliance with any national regulatory conditions.

WARNING 2 — Certain procedures specified in this document might involve the use or generation

of substances, or the generation of waste, that could constitute a local environmental hazard.

Reference should be made to appropriate documentation on safe handling and disposal after use.

1 Scope

This document specifies a method for measuring the stress in tension which is developed in vulcanized

rubber when it is heated (thermal stress). The thermal stress is measured for various pre-strain and

temperature conditions as a function of time.
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 5893, Rubber and plastics test equipment — Tensile, flexural and compression types (constant rate of

traverse) — Specification
ISO 18899:2013, 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 terminological databases for use in standardization at the following addresses:

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