Time-saving Whatman qualitative grades are offered in this convenient form, which gives major advantages over flat circles: Savings in time required to quadrant-fold circles to fit conical filter funnels in repetitive or multiple analyses, Decreased overall filtration time because of the extra surface area exposed; the normal slow down of filtration speed due to the loading of particulate is postponed, Increased total loading capacity as more filter area is available, Maintained flow rate due to the reduction in filter paper contact with funnel side and, the self-supporting shape of the filter itself, The prepleating does not significantly affect any of the technical data and the same figures may be used for the flat circles. Widely used for general purpose filtration. Has excellent particle retention and a good filtration speed and loading capacity. Slightly more retentive than Grade 1 with a corresponding increase in filtration time (i.e., slightly slower filtration speed). More absorbent than Grade 1. In addition to general filtration in the 8 μm particle size range, the extra absorbency is utilized, for example, to hold soil nutrient in plant growth trials. Also used for monitoring specific contaminants in the atmosphere and in soil testing. Also available prepleated as Grade 2V. Properties: medium flow, Particle Rrtention in liquid (μm): 8. Particle retention rating at 98 percent efficiency. Filtration speed (approx.) herzberg (s): 240. Basis weight (g/m sq): 103.