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|This Whatmanâ¢ 12.5cm Grade 1 qualitative cellulose filter paper is the most
widely used filter paper for routine applications with medium retention (11Âµm)
and flow rate.
Traditionally this grade is used in qualitative analytical separations for
precipitates such as lead sulfate calcium oxalate (hot) and calcium carbonate.
It is also used for numerous routine techniques in the food industry to separate
solid foodstuffs from associated liquid or extracting liquid; and is widely used in
education for teaching simple qualitative analytical separations.