These GE Whatman Qualitative Grade 4 Filter Papers are useful as a rapid filter for routine clean-up of biological fluids or organic extracts during analysis. They offer extremely fast filtering for course particles or gelatinous precipitates – use them when the collection of fine particles is not critical.
Retention of coarse particles: 20-25 µm.
For coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide
Very high flow rates – ideal for air pollution monitoring