Whatman Grade 4 Qualitative Filter Papers are a standard grade, high flow rate filter paper.
They are useful in qualitative analytical separations when fast flow is required and the collection of fine particles is not critical.
Excellent retention: Captures coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide.
Fast filtration: Useful for routine clean-up of biological fluids or organic extracts during analysis.
These cellulose filters are used in qualitative analytical techniques to determine and identify materials (e.g., in air pollution monitoring).
Grade 4 Qualitative Filter Papers, 20 - 25µm particle retention.