Cellulose powder - packing material, adsorbents for column chromatography. Cellulose powder - packing material, adsorbents for column chromatography. Native fibrous cellulose, standard grade, average degree of polymerization 620–680, fiber length (85 %) 20–100 μm, specific surface acc. to Blaine ~ 6500 cm²/g residue on ignition < 10000 ppm, < 20 ppm Fe, < 5 ppm Cu, < 7 ppm P, dichloromethane extract < 0.20 %.