Whatman 1005-055 Qualitative Filter Paper Circles, 2.5 Micron, 94 s/100mL/sq inch Flow Rate, Grade 5, 55mm Diameter (Pack of 100) 5.5cm Grade 5 Used in qualitative analytical techniques to determine and identify materials Has the maximum degree of fine particle filtration (2.5m) in the qualitative range; capable of retaining the fine precipitates encountered in chemical analysis Slow flow rate; excellent clarifying filter for cloudy suspensions and for water and soil analysis