PRAT DUMAS hardened quantitative filter paper, slow flow rate

Hardened 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. Recommended for thin precipitates, such as barium, lead, zinc or nickel sulfate, barium fluoride or barium hydroxide. High wet resistance. Surface weight 80 g/m², pore 7 - 9 μm, thickness 290 μm. Available in flat disks (foiled bags of 100 disks, with no carton box), or folded (in a carton box). Equivalent to: Whatman 50