JAPANESEINDUSTRIAL
STANDARD
Translated and Published by
Japanese Standards Association

JIS K 6253-3: 2023

(JRMA/JSA)

Rubber, vulcanized or thermoplastic —Determination of hardness — Part 3:
Durometer method

ICS 83.060
Reference number : JIS K 6253-3 : 2023 (E)
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13 S

K 6253-3 : 2023

Date of Establishment: 2012-03-21
Date of Revision:

2023-02-20

Date of Public Notice in Official Gazette: 2023-02-20
Investigated by: Japanese Industrial Standards CommitteeStandards Board for ISO area
JIS K 6253-3 : 2023, First English edition published in 2023-12
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 2024
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 6253-3 : 2023
Contents
PageIntroduction ······························································································· 11Scope ································································································ 12

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

Terms and definitions ·········································································· 24Principle of durometers ········································································ 25

Types and choice of durometers ····························································· 366.16.26.3
6.46.5
6.6
6.7

Tester ······························································································· 3
Pressure foot ······················································································ 3
Indentor ···························································································· 3
Indicating device ················································································ 7
Spring ······························································································ 7
Automatic timing device······································································· 8Stand ······························································································· 8Durometer spring force calibration ························································· 977.17.2

Test pieces ························································································· 9Sampling/preparation of test pieces ························································ 9Shape and dimensions of test pieces ······················································· 98Conditioning of test pieces ···································································1099.19.29.3

Test methods ····················································································10Test conditions ··················································································10Procedure ·························································································10Calibration and verification ·································································1110Expression of test results ····································································1111Precision ··························································································1112Test report························································································12Annex A (informative)

Precision of durometers ··············································13

Annex JA (informative)

Correspondence between JISs and corresponding
International Standards concerning determinationof hardness ·····························································16

Annex JB (informative)

Comparison table between JIS and correspondingInternational Standard ·············································18(i)PROTECTED BY COPYRIGHT

K 6253-3 : 2023Foreword
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 6253-3 : 2012), 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 Standard
may 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.
JIS K 6253 series consists of the following 5 parts under the general title

Rubber, vulcanized or thermoplastic — Determination of hardness
Part 1 : General guidancePart 2 : IRHD method (hardness between 10 IRHD and 100 IRHD)
Part 3 : Durometer method
Part 4 : IRHD pocket meter method
Part 5 : Calibration and verification of hardness testers(ii)
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JIS K 6253-3 : 2023

Rubber, vulcanized or thermoplastic — Determination ofhardness — Part 3 : Durometer method
Introduction
This Japanese Industrial Standard has been prepared based on ISO 48-4 : 2018,
Edition 1, 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 JB.
1ScopeThis Standard specifies a method for determining the hardness of vulcanized or
thermoplastic rubber using durometers.
NOTE 1

Annex JA gives the correspondence table between JIS K 6253 series andISO 48 series for better understanding of the relation between them.

NOTE 2The International Standard corresponding to this Standard and thesymbol of degree of correspondence are as follows.
ISO 48-4 : 2018 Rubber, vulcanized or thermoplastic — Determinationof hardness — Part 4 : Indentation hardness by durometer method(Shore hardness) (MOD)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.

2

WARNING 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 theeditions of the indicated year shall be applied and the revisions (including amendments) made thereafter shall not be applied. For those without the indication of thePROTECTED BY COPYRIGHT