• Grade 1: 11 µm
• The most widely used filter paper for routine applications with medium retention and flow rate
• In agriculture, it is used for soil analysis and seed testing procedures
• In the food industry, Grade 1 is used for numerous routine techniques to separate solid foodstuffs from associated liquid or extracting liquid
• In education, it is used 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 paper is impregnated with a chromogenic reagent and color formation quantified by optical reflectance
