Measuring Method
The Kappa number is determined by ISO 302:2004. ISO 302 is applicable to all kinds of chemical and semi-chemical pulps and gives a Kappa number in the range of 1-100. The Kappa number is a measurement of standard potassium permanganate solution that the pulp will consume. The measurement is inflated by the presence of hexenuronic acids in the pulp. These compounds are formed during the chemical pulping process, from the hemicelluloses.
The Kappa number can be monitored by online Kappa analysers in a pulp mill, but these have to be calibrated with the ISO 302:2004 method.
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