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Withdrawn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
Current Stage
9599 - Withdrawal of International Standard
Completion Date
06-Jan-2023
Ref Project

Relations

Buy Standard

Standard
ISO 12493:2017 - Rubber, vulcanized -- Determination of stress in tension upon heating
English language
11 pages
sale 15% off
Preview
sale 15% off
Preview

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
---------------------- Page: 1 ----------------------
ISO 12493:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, Published in Switzerland

All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2017 – All rights reserved
---------------------- Page: 2 ----------------------
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
---------------------- Page: 3 ----------------------
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

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: 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
---------------------- Page: 4 ----------------------
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
---------------------- Page: 5 ----------------------
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/
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.