WHATMAN Grade 1 Qualitative Filter Paper

Whatman^® Grade 1 filter paper is the most widely used filter paper for routine applications with medium retention and flow rate. It has particle retention of 11 μm at 98% efficiency. It covers a wide range of laboratory applications and is frequently used for clarifying liquids.
In agriculture, Grade 1 is used for soil analysis and seed testing procedures. In the food industry, it is used for numerous routine techniques to separate solid foodstuffs from associated liquid, or extracting liquid and is widely used in education for teaching simple qualitative analytical separations.
In air pollution monitoring, using circles or rolls, atmospheric dust is collected from airflow and the stain intensity measured photometrically. For gas detection, the filter paper is impregnated with a chromogenic reagent and color formation quantified by optical reflectance.