Fast, ashless filter paper. Equivalent to black ribbon. Recommended for analytical procedures involving coarse particles or gelatinous precipitates. - Filtration speed acc. to DIN 53137: 9 s. - Thickness 0.2 mm. - Weight: 85 g / m². - Ash-content: < 0.01 %. Fast, ashless filter paper. Equivalent to black ribbon. Recommended for analytical procedures involving coarse particles or gelatinous precipitates. - Filtration speed acc. to DIN 53137: 9 s. - Thickness 0.2 mm. - Weight: 85 g / m². - Ash-content: < 0.01 %.