ANSI/TAPPI T 212 om-22: One percent sodium hydroxide solubility of wood and pulp

Scope
This method for determination of 1% sodium hydroxide solubility can be applied to wood and to unbleached and bleached pulp.

Summary
Wood or pulp is extracted with hot 1% sodium hydroxide solution for 1 h. The loss in weight is determined and calculated as percent solubility.

Significance
3.1 Hot alkali solution extracts low-molecular-weight carbohydrates consisting mainly of hemicellulose and degraded cellulose in wood and pulp.
3.2 The solubility of wood could indicate the degree of a fungus decay or of degradation by heat, light, oxidation, etc. As the wood decays or degrades, the percentage of the alkali-soluble material increases (1, 2).
3.3 The solubility of pulp indicates an extent of cellulose degradation during pulping and bleaching processes and has been related to strength and other properties of pulp (3).

Publishing date: November 2022

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