Whatman® Cellulose Filters for general filtration exhibit particle retention levels down to 2.5 µm & with a choice of retention/flow rate combinations. Cellulose filters are tested for basis weight, thickness, air flow & strength. They guarantee quality, reproducibility & uniformity. Choose quantitative cellulose filters for gravimetric analysis. Our selection of qualitative cellulose filters include Whatman grades 1-6, 0048, 91, 113, 114, 287, 520, 591, 595, 597, 598, 602, 2555, as well as high wet-strength grades and application-specific grades.