Whatman Grade 4 filter paper is extremely fast filtering with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminium hydroxide.

Very useful as a rapid filter for routine clean-up of biological fluids or organic extracts during analysis.

Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

Whatman Grade 4 filter paper has a particle retention of 25 µm at 98% efficiency.

Whatman Grade 4 filter paper is extremely fast filtering with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminium hydroxide.

Very useful as a rapid filter for routine clean-up of biological fluids or organic extracts during analysis.

Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

Whatman Grade 4 filter paper has a particle retention of 25 µm at 98% efficiency.