Canadian Standard Freeness Tester

Figure 13.23. Schematic representation of the Canadian Standard Freeness Tester.

Thin stock free drainage measurement, with and without addition of retention/drainage aid, can be carried out readily using a Schopper Riegler Beating and Freeness Tester or Canadian Standard Freeness Tester (see Fig. 3.5). 

Fig. 3.5 Canadian Standard Freeness tester (Photo courtesy of Thwing-Albert Instrument Company)...

The degree of refinement was estimated by the Canadian Standard Freeness Tester (CSF), which measures the ease with which water drains away from a mat formed from the fibres. 

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