Hardened Quantitative disc filter paper, medium flow rate, Ø90 mm, 100 pcsHardened low ash paper (max 0. 02%), as an intermediate solution between quantatitive ash free paper (max 0. 002%) and qualitative paper low ash (max 0. 06%) for non critical quantitative works. Medium flow rate is the adequate for a general use, being the intermediate filter in terms of flow rate and retention. High wet resistance. Surface weight 80 g m, pore 8 12 ? m, thickness 270 ? m. Available in flat disks (foiled bags of 100 disks, with no