Filter Paper, Grade 3: 5µm

A multipurpose filter paper with a particle size of 9 micrometres, Grade 2 Filter Paper is distinguished from Grade 1 by having somewhat higher retention and greater absorption capacity. This property allows for a wider range of applications while extending the filtering time. Despite being appropriate for general filtrations, Grade 2 Filter Paper's improved absorbency finds use in niche jobs. For instance, it's used to keep soil nutrients in during tests on plant growth, which effectively aids in proper research. Its ability to absorb substances also makes it excellent for tracking particular toxins in the air and soil, making it a helpful tool for environmental and soil testing projects.

A common option for applications requiring high air flow rates in air pollution monitoring, where fine particle collection is not the main concern, is Grade 4 Filter Paper, which has pores with a diameter of 22 microns. Particularly for coarse particles and gelatinous precipitates like ferric hydroxide and aluminium hydroxide, this grade exhibits outstanding retention capacities and performs exceptionally well in quick filtration procedures.