Low ash filter papers for qualitative analysis, type 604, qualitative filter paper ,fast, 79 g/qm, filter circles

Low ash filter papers (aprox 0.08%) recommended for precise identification of materials and for sample preparation prior to sensitive detection methods. For specific analytical tests that require greater precision than "General use" filter papers. Perfectly qualified for food controls according LFBG § 64 Abs. 1 and 2, beverage analyses and environmental monitoring. Made of super-refined cotton linters and cellulose. Cellulose content above 95%. Plain and folded discs. • Fast filtering • Filtration Herzberg: 50 s • Retention of particles µm: 12 - 25 µm • Weight: 79 g/m² • Thickness: 0,19 mm Made of super-refined cotton linters and cellulose. α-cellulose content above 95%. High wet strength; easy to scrap off or wash off precipitates; no fiber release. Low ash content (aprox. 0.05%). High resistance to aggressive chemical components, like sulfuric and nitric acids (up to 40% at 50° Celcius) and alkalis (up to 10% at 20° Celcius).