Grade 1:11um. The most widely used filter paper for routine applications with medium retention and flow rate.This grade covers a wide range of laboratory applications and is frequently used for clarifying liquids.Traditionally the grade is used in qualitative analytical separations for precipitates such as lead sulfate,calcium oxalate (hot)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 and is widely used in education for teaching simple qualitative analytical separations. https://www.newstarsciences.com/...ilter-paper-grade-1.html