Filter papers

High-grade filter papers are invaluable for routine work in laboratory and industrial applications. Sartorius offers a broad range of filter papers and paper boards for various tasks and helps solve your filtration challenges.

Ash-free filter papers for quantitative and gravimetric analysis

Sartorius offers a full portfolio of quantitative filter papers, used for quantitative and gravimetric analyses as well as pressure or vacuum filtration. They contain an alpha-cellulose content of > 98 % and are acid-washed to make the papers ashless and achieve highest purity.

  • made of 100 % cotton linters
  • ash-free (Ash content < 0.01 % according to DIN 54370)
  • wet-strengthened
  • color-coded box for easy selection
  • supplied in sheet, disc, folded and customized formats

Ash-free filter papers for quantitative analysis overview

Filter papers for qualitative analyses

These qualitative filter papers are essentially used for analytical and routine purposes, when no gravimetric analyses are required. They are available for a wide range of different needs and applications.

  • large variety of paper grades
  • low ash content (0.06 – 0.15 %)
  • multiple diameters, thicknesses, particle retentions and filtration rates
  • supplied in sheet, disc, folded and customized formats
Wet-strengthened filter papersFind out more
High-purity filter papersFind out more
Smooth filter papersFind out more
Crêped Filter PapersFind out more

Filter papers for the absorption of liquids

Whenever a liquid must be captured, Sartorius offers a large variety of paper grades to ensure best results. Filter papers for absorption are used not only for general absorption applications but also for blotting, chromatography, seed germination tests or even protection of surfaces.

  • multiple dimensions, thicknesses, particle retentions and colors
  • supplied in rolls, sheets, discs, pleated or in customized formats
Surface protection papersFind out more
Blotting chromatography paperFind out more
Seed germination test papersFind out more
Filter boardsFind out more

Filter papers for special applications

Two special papers to clarify suspensions with very coarse particles or solutions with a high load of finest particles - or for the separation of liquids with hydrophobic and hydrophilic phase.

  • diatomaceous Earth filter paper, grade 470, to retain finest particles at high flow rates
  • phase Separator Paper, grade 480, an impregnated paper with stabilized silicon to retain water and allows solvents to flow through
Diatomaceus earth filter papersFind out more
Phase separator papersFind out more

FAQ about filter papers

Wet-strengthened papers are made for vacuum or pressure filtration. Due to their wet strength, they do not release any fibers. They are also revered for their mechanical and chemical resistance levels.

To produce quantitative papers, the high-quality raw materials (cotton linters with 98 % of alpha-cellulose content) are treated to reduce mineral content and therefore get an ignition residue of 0.01 %.

Qualitative papers are also made of high-quality raw materials (refined pulp & linters with 95 % of alpha-cellulose content) but without any reduction of mineral content. Their ignition residue is 0.1 %.

Quantitative and qualitative papers are mostly used in analytics due to their quality.

Qualitative and technical papers can be used in analytics for pre-filtration steps but predominantly cover technical filtration.

No, there is no relation between the weight of a paper and its filtration capacities. You can define filtration parameters of a paper over the thickness and length of the fibers (grinding time of the raw material). A 100 g/m² paper can get the same filtration rate than a 65 g/m² paper.

Filter papers are depth filters made of fibers with an irregular structure. Their depth structure allows retention of different particle sizes not only on the surface of the filter but also in its structure. A filter paper can only be defined by the capacity to retain a certain particle size. As there is no standard of how to define particle retention of a depth filter, the comparison between filters is valid only with filters tested with the same test method.