Filter paper circles Munktell grade 389 white spot, 150 mm Ø

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suitable for quantitative analysis, extremely low ash content (approx. 0.007 %), wet-strength, acid-washed, coarser precipitates such as lead-, iron- and silver sulphide, alcali carbonates, food stuff and soil analysis, medium fast filtering, medium pores, medium tight, medium crystalline, filtration velocity 20 s/10 ml, filtration time (Herzberg) 150 s/100 ml | 375 ml/min., basis weight 84 g/m², typical pore size (retention range / recommended guide) 8-12 µm, 100 circles in a pack