Specification of filtration performance

The objective of the filtration test is to determine the average rate at which cake is formed. It is more useful to know the rate of cake formation over a reasonable period so that the likelihood of marked reductions in form rate with time can be assessed. A Buchner funnel arrangement can be used for the filtration test(s) provided the funnel drainage characteristics are good. 

A funnel bottom with a sinter plate rather than a low permeability ceramic perforated plate is preferred, and such an arrangement is shown schematically in Section 4.1 where the filtration test procedure and analysis procedures are also described in detail. 

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