Whatman 1002-150 Quantitative Filter Paper Circles, 8 Micron, 21 s/100mL/sq inch Flow Rate, Grade 2, 150mm Diameter (Pack of 100) 15.0cm Grade 2 Used in qualitative analytical techniques to determine and identify materials General filtration in the 8m particle size range More absorbent than Grade 1; for example, it is able to hold soil nutrient in plant growth trials