TLG® Qualitative Filter Papers No.1 are generally used for routine laboratory applications. These filter papers with medium retention & flow rate, are frequently used for clarifying liquids and in qualitative analytical separations for precipitates. SPECIFICATIONS Material: Cellulose Porosity: Medium Surface: Smooth Particle Retention in Liquid: 11µm Herzberg Filtration Speed: 173sec/100mL (or ASTM: 40sec) Nominal Thickness: 170 ± 10µm Nominal Weight: 92g/m² Nominal Ash Content : 0.06% Package Size: 100 Pieces