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TAPPI T 221 cm-09
- Drainage Time of Pulp
- standard by Technical Association of the Pulp and Paper Industry, 01/01/2009
- Publisher: TAPPI
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This method describes a procedure to determine numerically a measure of the slowness of stock, particularly groundwood or beaten pulps. Drainage time is not necessarily related to freeness of pulp, which is determined by TAPPI T 227 "Freeness of Pulp."