For medium retention and flow rate, Grade 1 Filter Papers (11µm) cover a wide range of laboratory applications—clarification of liquids, soil analysis, seed testing procedures and air pollution monitoring.
Grade 4 Filter Papers (20-25µm) 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 sizes.Boxes of 100. Whatman products are intended for research and development purposes only.