Whatman Group offers Cellulose Filters with High Quality Cotton Linters. Whatman Group manufactures English mill making fine, handcrafted paper. The Cellulose Filters with High Quality Cotton Linters are manufactured from high quality cotton linters which have been treated to achieve a minimum alpha cellulose content of 98%. The Cellulose Filters with High Quality Cotton Linters are used for general filtration and exhibit particle retention levels down to 2.5 æm. The different groups of cellulose filters offer increasing degrees of purity, hardness, and chemical resistance.