Whatman 1213-150 Quantitative Folded Filter Paper, 30 Micron, Grade 113V, 150mm Diameter (Pack of 100) Diameter: 15.0cm; retention: 30m Very thick, strong filter with creped surface for extremely high loading capacity in folded form Ideal for coarse particles and gelatinous preciptates, time-saving qualitative grades offered in a convenient form; major advantages over flat circles Decreased overall filtration time with extra surface area; normal slow down of filtration speed with loading of particulate is postponed Increased total loading capacity since more filter area available; maintained flow rate because reduction in filter paper contact with funnel side and self-supporting shape of filter