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GRADE 1 : 12.5cm - Equivalent to Whatman qualitative grade 1, standard lab filter paper (125mm) LAB FILTER - Routinely used in lab to determine fat content, extract solids and clarify liquids CHEMISTRY CLASS - Filter paper can teach basic qualitative separations and paper chromatography AIR FILTRATION - Collect medium particles for pollution monitoring MEDIUM RETENTION / MEDIUM FLOW - Retains medium crystalline particles (10~15 micron)"