These filter papers are used for quantitative analysis. They are made of refined pulp and linters with over 98% alpha-cellulose content. Moreover, these filter papers are guaranteed to be free of any residual acids that are used in a few production methods. These filters are virtually ash-free.

Sartorius Ashless Filter Papers, with the grade Numbers 388, 389, 390, 391, 392 and 393, are characterised by high wet strength and high purity, classified according to their separating capacity.

These papers are especially suitable for quantitative analysis, Buchner funnels, pressure or vacuum filtration and are available in different formats as in reels, sheets, discs, and folded filters.

For Whatman equivalents, see comparison table

Very slow rate ashless filter with high retention of fine precipitates - Quantitative comparable to Whatman Grade 42. Supplied in packs of 100