Skip to main content
Back

ISO 302:2015

Pulps -- Determination of Kappa number

General information

Valid from 24.07.2015
ICS Groups
85.040 Pulps
Directives or regulations
None

Standard history

Status
Date
Type
Name
24.07.2015
Main
ISO 302:2015 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.
ISO 302:2015 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 chlorine-consumption 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.

Required fields are indicated with *

*
*
*
PDF
82.61 € incl tax
Paper
82.61 € incl tax
Standard monitoring