JAPANESEINDUSTRIAL
STANDARD
Translated and Published by
Japanese Standards Association

JIS K 6263: 2022

(JRMA/JSA)

Rubber, vulcanized or thermoplastics —Determination of stress relaxation

ICS 83.060
Reference number : JIS K 6263 : 2022 (E)
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14 S

K 6263 : 2022

Date of Establishment: 1993-02-01
Date of Revision:

2022-02-21

Date of Public Notice in Official Gazette: 2022-02-21
Investigated by: Japanese Industrial Standards CommitteeStandards Board for ISO area
JIS K 6263 : 2022, First English edition published in 2023-07
Translated and published by: Japanese Standards Association
Mita MT Building, 3-13-12, Mita, Minato-ku, Tokyo, 108-0073 JAPANIn the event of any doubts arising as to the contents,
the original JIS is to be the final authority.
 JSA 2023
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized
in any form or by any means, electronic or mechanical, including photocopying and microfilm, without
permission in writing from the publisher.
Printed in JapanHN

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K 6263 : 2022
ContentsPageIntroduction ······························································································· 11Scope ································································································ 12

Normative references··········································································· 13

Terms and definitions ·········································································· 24Classification of tests ··········································································· 355.1
5.2
5.3
5.4
5.5
5.6
5.7
5.8
5.9

Compression stress relaxation tests························································ 3Principle ··························································································· 3Apparatus ························································································· 4
Calibration ························································································ 5
Test piece ·························································································· 6Duration, temperature and test liquid ···················································· 7
Procedure ·························································································· 8
Expression of results ··········································································10Precision ··························································································11
Test report ·······················································································1166.16.26.36.46.56.66.76.8

Tensile stress relaxation tests ······························································11
Principle ··························································································11Apparatus ························································································12Calibration ·······················································································12Test piece ·························································································12Duration and temperature of test ·························································13
Procedure ·························································································13
Expression of results ··········································································14
Test report ·······················································································15

Annex A (informative)

Determination method for compression stress relaxation — Precision························································16

Annex B (normative)

Calibration schedule ····················································18

Annex JA (informative)

Comparison table between JIS and corresponding
International Standard ·············································21(i)PROTECTED BY COPYRIGHT

K 6263 : 2022

Foreword
This Japanese Industrial Standard has been revised by the Minister ofEconomy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee as the result of proposal for revision ofJapanese Industrial Standard submitted by The Japan Rubber Manufacturers Association (JRMA)/Japanese Standards Association (JSA) witha draft being attached, based on the provision of Article 12, paragraph (1)of the Industrial Standardization Act applied mutatis mutandis pursuant
to the provision of Article 16 of the said Act. This edition replaces theprevious edition (JIS K 6263 : 2015), which has been technically revised.
This JIS document is protected by the Copyright Act.
Attention is drawn to the possibility that some parts of this Standardmay conflict with patent rights, published patent application or utility
model rights. The relevant Minister and the Japanese Industrial Standards Committee are not responsible for identifying any of such patentrights, published patent application or utility model rights.

(ii)
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JIS K 6263 : 2022

Rubber, vulcanized or thermoplastics — Determination ofstress relaxation
Introduction
This Japanese Industrial Standard has been prepared based on ISO 3384-1 : 2019,
Edition 2, with some modifications of the technical contents.
The vertical lines on both sides and dotted underlines indicate changes from the corresponding International Standard. A list of modifications with the explanations isgiven in Annex JA.
1ScopeThis Standard specifies procedures for determining the decrease in counterforce exerted by vulcanized or thermoplastic rubber which has been subjected to the specifiedcompression or tensile deformation and maintained in the specified environment (notless than the standard laboratory temperature). Testing at temperatures below standard laboratory temperature can be conducted; however, the reliability of the results isnot proven.
NOTEThe International Standard corresponding to this Standard and thesymbol of degree of correspondence are as follows.

Rubber, vulcanized or thermoplastic — Determination of stress relaxation in compression — Part 1: Testing at constanttemperature (MOD)ISO 3384-1 : 2019

In addition, symbols which denote the degree of correspondence in thecontents between the relevant International Standard and JIS are IDT(identical), MOD (modified), and NEQ (not equivalent) according toISO/IEC Guide 21-1.

2WARNING 1

Persons using this Standard should be familiar with normal laboratory practice. This Standard does not purport to address all of thesafety problems, if any, associated with its use. It is the responsibility of the user of this Standard to establish appropriate safety andhealth practices.

WARNING 2

Certain procedures specified in this Standard might involve the use
or generation of substances, or the generation of waste, that could
constitute a local environmental hazard. Reference should be madeto appropriate laws/regulations on safe handling and disposal afteruse.

Normative references

Part or all of the provisions of the following standards, through reference in this text,
constitute provisions of this Standard. For standards with the year indication, only thePROTECTED BY COPYRIGHT