These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Pleated qualitative filters are available, offering better flow rate and higher load capacity than equivalent flat filters. They are produced in such a way as to guarantee a minimum cellulose content of 98%. They are also available in the reinforced version with high resistance to wetness thanks to the presence of a small amount of chemically stable resin. The full range of prestigious Whatman products   (Cytiva) is also available.