CAN/CGSB-9.0 No. 1-92

This National Standard of Canada is based on International Standard ISO 302:1981. 1.1 The Kappa number test is used for evaluation of pulps with regard to the degree of delignification and bleachability. 1.2 The method can be applied to pulps produced in yields up to about 65% and giving Kappa numbers not higher than 100 on hardwood pulps, and not higher than 120 on softwood pulps (Note 1). Note 1: High-yield pulps consume less permanganate for a given yield and lignin content, and cannot be evaluated by this method. Another method, Technical Section, CPPA standard G.32P can be used for evaluation of the whole range of pulps for delignification and bleachability.