National foreword

This British Standard is the UK implementation of ISO 6502‑1:2025. It supersedes BS ISO 6502‑1:2018, which is withdrawn.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 July 2025.

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 second edition cancels and replaces the first edition (ISO 6502‑1:2018), which has been technically revised.

The main changes are as follows:

description of t’_c(50) was corrected in Clause 4;
descriptions of reciprocating types and top hat type dies were deleted.

A list of all parts in the ISO 6502 series can be found on the ISO website.

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.

Introduction

An International Standard specifying requirements for the use of oscillating disc curemeters was established in 1977 as ISO 3417.1 Later, when various rotorless curemeters were developed and became popular, an International Standard for these instruments was produced as ISO 65022. However, owing to the differences in geometry and construction of the various available instruments, ISO 6502 was not able to specify such requirements in detail. In 1999, it became clear that a number of different rotorless curemeters were available and that significant developments had taken place and were continuing to do so. Hence, it was concluded that, rather than specify individual rotorless instruments, possibly restricting future developments, a more general document was required. Accordingly, it was decided to provide general guidance and assistance in the design and use of curemeters.

The previous edition of this document (ISO 6502‑1:2018) replaced ISO 6502, which was split into subsequent parts, covering oscillating disc curemeters (ISO 6502‑2) and rotorless curemeters (ISO 6502‑3). ISO 6502‑1 covers the general principle required for the measurement of vulcanization characteristics using curemeters.

1 Scope

This document provides an introduction to the determination of vulcanization characteristics of rubber compounds by means of curemeters. It describes the basic principles and general requirements for curemeters.

2 Normative references

3 Terms and definitions

4 Basic principles

5 Types of curemeter

6 Apparatus

6.1 General

6.2 Dies

6.3 Die closure

6.4 Moving member

6.5 Movement

6.6 Stiffness measurement

6.7 Heating and temperature control

6.8 Calibration

7 Test piece

8 Vulcanization temperature

9 Conditioning

10 Procedure

10.1 Preparation for test

10.2 Loading the curemeter

11 Expression of results

Bibliography

BS ISO 6502-1:2025

Rubber. Measurement of vulcanization characteristics using curemeters - Introduction

Current

Published:

31 Jul 2025