Ash-free paper (max 0.002%) made exclusively of cellulose cotton fibers. Its quick flow rate makes it recommendable for large precipitates, such as iron hydroxide and other metal sulfates. Surface weight 80 g/m², pore 12 - 16 ?m, thickness 250 ?m. Available in flat disks. Equivalent to: Whatman 41 and 43

Ash-free paper (max 0.002%) made exclusively of cellulose cotton fibers. Its quick flow rate makes it recommendable for large precipitates, such as iron hydroxyde and other metal sulfates. Surface weight 80 g/m², pore 10 - 15 ?m, thickness 250 ?m. Available in flat disks. Equivalent to: Whatman 43