Pulps. Determination of Kappa number

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-07-2015

Publisher

British Standards Institution

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents and materials
6 Apparatus and equipment
7 Sampling and preparation of sample
8 Procedure
9 Calculations
10 Test report
Annex A (informative) - Precision
Bibliography

Describes a method for the determination of the Kappa number of pulp.

This International Standard specifies a method for the determination of the Kappa number of pulp. The Kappa number is an indication of the lignin content or bleachability of pulp.

This International Standard is applicable to all kinds of chemical pulps and semi-chemical pulps within the Kappa number range 1 to 100. For pulps with a Kappa number exceeding 100, use the chlorineconsumption procedure (ISO 3260) to describe the degree of delignification.

To achieve the greatest precision and accuracy, the sample size has to be adjusted so that the consumption of permanganate falls between 20 % and 60 % of the amount added.

NOTE There is no general and unambiguous relationship between the Kappa number and the lignin content of pulp. The relationship varies according to the wood species and delignification procedure. All compounds oxidized by KMnO4, not only lignin, will increase the consumption of KMnO4, and thereby increase the Kappa number.[8] If the Kappa number is to be used to derive an index of pulp lignin content, specific relationships will have to be developed for each pulp type.

Committee	PAI/11
DevelopmentNote	Supersedes 03/306735 DC and BS 4498(1982). (03/2007) Supersedes 14/30302567 DC. (08/2015)
DocumentType	Standard
Pages	22
PublisherName	British Standards Institution
Status	Current
Supersedes	BS 4498:1982 03/306735 DC : DRAFT MAY 2003 BS ISO 302:2004 14/30302567 DC : 0

Standards	Relationship
ISO 302:2015	Identical

BS 4971:2017

Conservation and care of archive and library collections

ISO 638:2008	Paper, board and pulps Determination of dry matter content Oven-drying method
ISO/TR 24498:2006	Paper, board and pulps Estimation of uncertainty for test methods
ISO 3260:2015	Pulps Determination of chlorine consumption (Degree of delignification)
ISO 7213:1981	Pulps Sampling for testing

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BS ISO 302:2015

Pulps. Determination of Kappa number

Table of Contents

Abstract

Scope

General Product Information

International Equivalents

Standards Referenced By This Book

Standards Referencing This Book

Category

Subcategory