A Guide to Whatman Filter Paper Grades Cytiva
Filter Paper Grade 2 Circles mm to 500 mm available prepleated Sheets 460 x 570 mm to 580 x 680 mm Particle retention 1 8µm Nominal thickness 190 µm Nominal basis weight 97 g/m 2 Nominal ash content 2 % Grade 2 is slightly more retentive than Grade 1 with an equivalent increase in filtration time