Whatman® Qualitative Filter Papers

Conduct Analytics Quickly with Qualitative Filter Papers

Two grades of Qualitative Filter Papers come in a variety of diameters and deliver the purity and consistent performance of more sophisticated analytical grades.
Grade 1 (11µm) Filters provide medium retention and flow rate. Use them for clarification of liquids, soil analysis, seed testing procedures and air pollution monitoring. Choose from a variety of diameters. Boxes of 100.
Grade 4 (20–25µm) Filters offer extremely fast filtration with excellent retention of coarse particles and gelatinous precipitates—ferric hydroxide and aluminum hydroxide. Useful as a rapid filter for routine cleanup of biological fluids or organic extracts during analysis. Choose from a variety of diameters. Boxes of 100.