National foreword

This British Standard is the UK implementation of ISO 3689:2024.

The UK participation in its preparation was entrusted to Technical Committee PAI/11, Methods of test for paper, board and pulps.

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 October 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 6, Paper, board and pulps, Subcommittee SC 2, Test methods and quality specifications for paper and board.

This third edition cancels and replaces the second edition (ISO 3689:1983), which has been technically revised.

The main changes are as follows:

Clause 2 has been updated;
Terms for burst index (3.3), felt side (3.4), and wire side (3.5) have been added in Clause 3;
Clause 5 has been revised;
7.2 “conditioning” has been updated;
Clause 8 “Procedure” is revised, especially immersion time (8.1.2) and excess water removal (8.1.3) has been added;
Former 8.3 “determination” in particular the limits of the bursting strength are revised;
Former 8.4 “number of tests” is revised;
Former Clause 9 “Expression of results” is technically revised;
Clause 10 “Precision” has been updated;
Clause 11 “Test report” is revised;
Annex A with examples of possible support systems has been added;
editorially revised.

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 wet strength of paper and board by measuring its bursting strength after it has been immersed in water for a specified period.

The method is applicable to most kinds of paper and board, provided that an appropriate immersion time is agreed between the interested parties.

Different results can be found if the sample is re-tested after a period of time.

2 Normative references

3 Terms and definitions

4 Principle

5 Apparatus, reagents and materials

5.1

5.1.2

5.2

5.3

5.4

5.5

5.6

5.7

6 Sampling

7 Test pieces

7.1 Preparation

7.2 Conditioning

8 Procedure

8.1 Immersion

8.2 Determination

8.3 Number of tests

9 Expression of results

10 Precision

11 Test report

Bibliography

BS ISO 3689:2024

Paper and board. Determination of bursting strength after immersion in water

Current

Published:

31 Oct 2024