This Whatman 5.5cm, grade 5, cellulose filter paper is used in qualitative analytical techniques to determine and identify materials. It has the maximum degree of fine particle filtration (2.5µm) in the qualitative range. It is capable of retaining the fine precipitates encountered in chemical analysis. This filter paper has a slow flow rate. This is an excellent clarifying filter for cloudy suspensions and for water and soil analysis. Retention: 2.5µm. Diameter: 5.5cm. 100/Pack. Whatman #: 1005-055.