Hardened Quantitative folded filter paper, fast flow rate, Ø125 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. Its flow rate makes it suitable for large precipitates, such as iron hydroxide and other metal sulfides. High wet resistance. Surface weight 80 g m, pore 12 16 ? m, thickness 250 ? m. Available in flat disks (foiled bags of 100 disks, with no carton box), or