TAPPI UM 205 2010

TAPPI UM 205 provides a practical procedure for measuring dirt in pulp by transmitted light, complementing TAPPI T 213, which uses reflected light. The method covers applicable pulp types, required apparatus, sample preparation, handsheet formation, hydraulic pressing, visual inspection, dirt-speck counting, reporting, and precision considerations. It is especially relevant to pulp testing laboratories, quality control teams, paper manufacturers, and technical professionals evaluating foreign material in slush, dry, or sheet pulp.

Application Scope: Measurement of visible dirt specks larger than 0.04 mm2 per gram of moisture-free pulp using transmitted light.