National foreword

This British Standard is the UK implementation of ISO 37:2024. It supersedes BS ISO 37:2017, which is withdrawn.

The UK participation in its preparation was entrusted to Technical Committee PRI/22, Testing and analysis of rubber.

A list of organizations represented on this committee can be obtained on request to its committee manager.

Contractual and legal considerations

This publication has been prepared in good faith, however no representation, warranty, assurance or undertaking (express or implied) is or will be made, and no responsibility or liability is or will be accepted by BSI in relation to the adequacy, accuracy, completeness or reasonableness of this publication. All and any such responsibility and liability is expressly disclaimed to the full extent permitted by the law.

This publication is provided as is, and is to be used at the recipient’s own risk.

The recipient is advised to consider seeking professional guidance with respect to its use of this publication.

This publication is not intended to constitute a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2024.

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 seventh edition cancels and replaces the sixth edition (ISO 37:2017), which has been technically revised.

The main changes are as follows:

a calibration schedule has been added;
corrections made to black designations;
symbols changed to comply with the ISO/IEC Directives part 2.

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.

1 Scope

This document specifies a method for the determination of the tensile stress-strain properties of vulcanized and thermoplastic rubbers.

The properties which can be determined are tensile strength, elongation at break, stress at a given elongation, elongation at a given stress, stress at yield and elongation at yield. The measurement of stress and strain at yield applies only to some thermoplastic rubbers and certain other compounds.

2 Normative references

3 Terms, definitions and abbreviated terms

4 Principle

5 General

6 Test pieces

6.1 General

6.2 Dumbbells

6.3 Rings

7 Apparatus

7.1 Dies and cutters

7.2 Thickness gauge

7.3 Cone gauge

7.4 Tensile-testing machine

7.5 Test rig for ring test pieces

8 Calibration

9 Number of test pieces

10 Preparation of test pieces

10.1 Dumbbells

10.2 Rings

11 Conditioning of sample and test pieces

11.1 Time between vulcanization and testing

11.2 Protection of samples and test pieces

11.3 Conditioning of samples

11.4 Conditioning of test pieces

12 Marking of dumbbell test pieces

13 Measurement of test pieces

13.1 Dumbbells

13.2 Rings

13.3 Comparison of groups of test pieces

14 Procedure

14.1 Dumbbell test pieces

14.2 Ring test pieces

15 Temperature of test

16 Calculation of results

16.1 Dumbbells

16.2 Ring test pieces

17 Expression of results

18 Precision

19 Test report

Bibliography

BS ISO 37:2024

Rubber, vulcanized or thermoplastic. Determination of tensile stress-strain properties

Current

Published:

31 May 2024