Whatman filter paper is a cellulose paper made by using a high percentage of alpha-cellulose. These filter papars are also known as quantitative filters . We provide Whatman extensive line of filter papers that have innovative features that make these perfect for filtering techniques. Qualitative Filter Papers | Grade 2:8 µm| Grade 3:6 µm | Grade 4:20-25 µm| Grade 5:2.5 µm | Grade 6:3 µm | Grade 591:7-12 µm | Grade 595:4-7 µm | Grade 597:4-7 µm| Grade 598:8-10 µm | Grade 602h:<2 µm | Ashless Grades Grade 40:8 µm | Grade 41:20-25 µm | Grade 42:2.5 µm | Filter Papers and Membranes | Hardened Low Ash Grades | Hardened Low Ash Grades etc.