Paper and board — Determination of alkali reserve

This document specifies a method for the determination of the alkali reserve of papers and boards. lt is intended for products that contain alkaline pigments or other alkaline material, added to improve their resistance to acid attack (degradation). This document is not applicable to laminated, printed or otherwise processed grades that will not disintegrate completely by the procedure described. The result obtained will include alkaline pigments contained in the coating of a coated paper. NOTE Such alkaline coating will protect the core of the paper from acid substances in ambient air, but its effect on acid substances generated in the base paper itself is uncertain.

Papier et carton — Détermination de la réserve alcaline

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Status
Published
Publication Date
10-Feb-2022
Current Stage
Ref Project

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INTERNATIONAL ISO
STANDARD 10716
Second edition
2022-02
Paper and board — Determination of
alkali reserve
Papier et carton — Détermination de la réserve alcaline
Reference number
ISO 10716:2022(E)
© ISO 2022
---------------------- Page: 1 ----------------------
ISO 10716:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2022 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 10716:2022(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Reagents ........................................................................................................................................................................................................................ 1

5.1 Hydrochloric acid ................................................................................................................................................................................. 2

5.2 Sodium hydroxide solution .......................................................................................................................................................... 2

5.3 Methyl red ................................................................................................................................................................................................... 2

6 Apparatus .................................................................................................................................................................................................................... 2

7 Sampling and preparation of test pieces .................................................................................................................................... 2

8 Procedure ....................................................................................................................................................................................................................2

9 Calculation .................................................................................................................................................................................................................. 3

10 Precision ....................................................................................................................................................................................................................... 3

11 Test report .................................................................................................................................................................................................................. 3

Annex A (informative) Precision ............................................................................................................................................................................. 4

iii
© ISO 2022 – All rights reserved
---------------------- Page: 3 ----------------------
ISO 10716:2022(E)
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 documents 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).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

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.

This second edition cancels and replaces the first edition (ISO 10716:1994), of which it constitutes a

minor revision. The main changes are as follows.
— Clause 2 has been updated.

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.
© ISO 2022 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 10716:2022(E)
Introduction

Papers produced to be stable for long time periods normally contain some alkaline filler, such as calcium

carbonate, as an alkali reserve to prevent attack from acid substances in ambient air or formed by

deterioration of substances in the paper. Specifications for paper permanence can require a minimum

alkali reserve.

The required alkali reserve is obtained by adding some form of calcium carbonate to the paper furnish

but other substances can also be used for this purpose. By expressing the test results in moles per

kilogram of alkaline substances and not as a calcium carbonate content, no confusion arises when

alkaline substances other than calcium carbonate a
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 10716
ISO/TC 6
Paper and board — Determination of
Secretariat: SCC
alkali reserve
Voting begins on:
2021-11-10
Papier et carton — Détermination de la réserve alcaline
Voting terminates on:
2022-01-05
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 10716:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2021
---------------------- Page: 1 ----------------------
ISO/FDIS 10716:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on

the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below

or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
© ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/FDIS 10716:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction .................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ..................................................................................................................................................................................... 1

3 Terms and definitions .................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Reagents ........................................................................................................................................................................................................................ 1

5.1 Hydrochloric acid ................................................................................................................................................................................. 2

5.2 Sodium hydroxide solution .......................................................................................................................................................... 2

5.3 Methyl red ................................................................................................................................................................................................... 2

6 Apparatus .................................................................................................................................................................................................................... 2

7 Sampling and preparation of test pieces .................................................................................................................................... 2

8 Procedure ....................................................................................................................................................................................................................2

9 Calculation .................................................................................................................................................................................................................. 3

10 Precision ....................................................................................................................................................................................................................... 3

11 Test report .................................................................................................................................................................................................................. 3

Annex A Precision .................................................................................................................................................................................................................4

iii
© ISO 2021 – All rights reserved
---------------------- Page: 3 ----------------------
ISO/FDIS 10716:2021(E)
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 documents 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).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www.iso.org/patents).

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.

This second edition cancels and replaces the first edition (ISO 10716:1994), of which it constitutes a

minor revision. The main changes are as follows.
— Clause 2 has been updated.

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.
© ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/FDIS 10716:2021(E)
Introduction

Papers produced to be stable for long time periods normally contain some alkaline filler, such as calcium

carbonate, as an alkali reserve to prevent attack from acid substances in ambient air or formed by

deterioration of substances in the paper. Specifications for paper permanence can require a minimum

alkali reserve.
The required alkali reserve is obtained by adding some fo
...

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