Call: 1.800.WHATMAN

Cellulose Filters

SampleIs the precipitate/retentate to be

ashed for gravimetric analysis?

YES

Is the suspension strongly acidic or alkaline?

NO

Is the precipitate/retentate to be removed from filter surface?

NO

Use Whatman ashless grades

Is the precipitate fine?

Use Whatman hardened ashless grades

Is the precipitate fine?

YES

Precipitate coarse or gelatinous?

NOYES

540541

NOYES

542 4442

NOYES

Precipitate coarse or gelatinous?

41

NOYES

40 43

NO

Use Whatman qualitative filter paper

Use Whatman hardened grades

Is the precipitate fine?

YES

Precipitate coarse or gelatinous?

NOYES

5254

NOYES

50

Whatman Grade

Quantitative Filter Paper Quick Pick Reference Chart