Standard Filter Paper for qualitative analysis. Features/ Specifications: • Ash content: 0.1 %. • Filtration time complies with DIN 53137. • Alpha cellulose content: approx. 95 %. • Thin filter paper for standard use. • Particularly filtration of water, saline solutions etc. • Surface weight: 70 g/m2 • Thickness: 0.16 mm • Medium filtration speed • Filtration time: 22s • Retention range: >4 µm