Centrifugation Tubes

The filter papers for quantitative analyses are made of 100 % cotton linters. For maximum purity the papers are acid-washed and cleaned with demineralized water. Ash content is 0.007 %.

Grade 1015, medium to slow filtering, particle retention 5-8 µm, filtration speed 50 s according to DIN 53137, basis weight 84 g/m², thickness 0.16 mm

For fine precipitates (magnesium phosphate, ammonium phosphate, calcium oxalate, coarser flaked forms of barium sulphate).

The filter papers for quantitative analyses are made of 100 % cotton linters. For maximum purity the papers are acid-washed and cleaned with demineralized water. Ash content is 0.007 %.

Grade 1005, fast filtering, particle retention 12-15 µm, filtration speed 10 s complies with DIN 53137, basis weight 84 g/m², thickness 0.18 mm

For coarse, voluminous precipitates (e.g. iron, aluminium and chrome hydroxide).

The filter papers for quantitative analyses are made of 100 % cotton linters. For maximum purity the papers are acid-washed and cleaned with demineralized water. Ash content is 0.007 %.

Grade 1010, medium fast filtering, particle retention 8-12 µm, filtration speed 20 s according to DIN 53137, basis weight 84 g/m², thickness 0.17 mm

For relatively coarse-flaked precipitates (lead, iron, silver sulphides, alkali metal carbonate, lead chromate, arsenic, antimony, cadmium, foodstuffs).

The filter papers for quantitative analyses are made of 100 % cotton linters. For maximum purity the papers are acid-washed and cleaned with demineralized water. Ash content is 0.007 %.

Grade 1025, very slow filtering, particle retention 2-3 µm, filtration speed 180 s according to DIN 53137, basis weight 84 g/m², thickness 0.14 mm

For difficult filtration requirements or very fine precipitates (e.g. barium sulphate, copper oxide, tin oxide).

The filter papers for quantitative analyses are made of 100 % cotton linters. For maximum purity the papers are acid-washed and cleaned with demineralized water. Ash content is 0.007 %.

Grade 1020, slow filtering, particle retention 3-5 µm, filtration speed 100 s according to DIN 53137, basis weight 84 g/m², thickness 0.15 mm

For fine-grained precipitates (e.g. lead oxide, calcium fluoride, nickel sulphide, zinc sulphide).

The wet-strengthened filter papers exhibit a very high degree of mechanical stability. They are resistant against acidic and alkaline solutions and are suitable for pressure and vacuum filtration. They are made of 100 % cotton linters. For maximum purity the papers are acid-washed and cleaned with demineralized water. Ash content is 0.007 %.


Grade 1110, medium fast filtering, particle retention 8-12 µm, filtration speed 20 s according to DIN 53137, basis weight 84 g/m², thickness 0.17 mm, wet strengthened

For relatively coarse-flaked precipitates (lead, iron, silver sulphides, alkali metal carbonate, lead chromate, arsenic, antimony, cadmium, foodstuffs). Especially high mechanical strength and resistance to acids and alkalis.

The wet-strengthened filter papers exhibit a very high degree of mechanical stability. They are resistant against acidic and alkaline solutions and are suitable for pressure and vacuum filtration. They are made of 100 % cotton linters. For maximum purity the papers are acid-washed and cleaned with demineralized water. Ash content is 0.007 %.


Grade 1105, fast filtering, particle retention 12-15 µm, filtration speed 10 s according to DIN 53137, basis weight 84 g/m², thickness 0.18 mm, wet strengthened

For coarse, voluminous precipitates (e.g. iron, aluminium and chrome hydroxide). Especially high mechanical strength and resistance to acids and alkalis.

The wet-strengthened filter papers exhibit a very high degree of mechanical stability. They are resistant against acidic and alkaline solutions and are suitable for pressure and vacuum filtration. They are made of 100 % cotton linters. For maximum purity the papers are acid-washed and cleaned with demineralized water. Ash content is 0.007 %.


Grade 1125, very slow filtering, particle retention 2.5 µm, filtration speed 180 s according to DIN 53137, basis weight 84 g/m², thickness 0.15 mm, wet strengthened

For difficult filtration requirements or very fine precipitates (e.g. barium sulphate, copper oxide, tin oxide) Especially high mechanical strength and resistance to acids and alkalis.

The wet-strengthened filter papers exhibit a very high degree of mechanical stability. They are resistant against acidic and alkaline solutions and are suitable for pressure and vacuum filtration. They are made of 100 % cotton linters. For maximum purity the papers are acid-washed and cleaned with demineralized water. Ash content is 0.007 %.


Grade 1115, medium to slow filtering, particle retention 5-8 µm, filtration speed 50 s complies with DIN 53137, basis weight 84 g/m², thickness 0.16 mm, wet strengthened

For fine precipitates (magnesium phosphate, ammonium phosphate, calcium oxalate, coarser flaked forms of barium sulphate). Especially high mechanical strength and resistance to acids and alkalis.

Made from 100% cellulose.
Ash content 0,007%.
Filtration speed according to DIN 53137.
Capacity of separation according to DIN 53135.
Very fast, pore size 12 to 15 µm

• For coarse, high volume precipitates
• Fordeterminations according to the German Standard Methods for the examination of water, waste water and sludge
• ForFe(OH)₂, Al(OH)₃, NaSO₄
• ashless, equivalent black ribbon

Made from 100% cellulose.
Ash content 0,007%.
Filtration speed according to DIN 53137.
Capacity of separation according to DIN 53135.
Slow, pore size 2 to 3 µm.

• for very fine precipitates and small particles
• for soil analysis
• for BaSO₄ (hot precipitate), PbSO₄, Cu₂O, ZnS, NiS
• ashless, equivalent blue tape

Made from 100% cellulose.
Ash content 0,007%.
Filtration speed according to DIN 53137.
Capacity of separation according to DIN 53135.
Medium fast, pore size 5 to 8µm.

• for NH₄MgPO₄, CaC₂O₄, BaSO₄
• ashless, equivalent red tape

Made from 100% cellulose.
Ash content 0,007%.
Filtration speed according to DIN 53137.
Capacity of separation according to DIN 53135.
Fast, pore size 8 to 12µm.

• most frequently used quantitative filter
• for PbS, Ag₂S, FeS, carbonates
• ashless, equivalent white tape

Circles. Quantitative. Ashless.

Circles. Quantitative. Ashless. For filtration of coarse and gelatinous precipitates. Supplied in box of 100.

Circles. Quantitative. Ashless. For filtration of fine precipitates.

Medium fast, 4 to 12 µm. White ribbon.

• for the analysis of foodstuffs
• for carbonates of alkaline earth metals, (NH₄)₃[P(Mo₃O₁₀)₄] x aq., Mg(NH₄)PO₄, CaC₂O₄ (hot precipitates)
• Weight: 85g/m²
• Thickness: 0.18mm

Fast filtration, smooth, ashless.

Slow < 2 µm. Blue ribbon.

• for very fine precipitates and small particles
• for soil analysis
• for BaSO₄ (hot precipitate), PbSo₄, Cu₂O, ZnS, NiS
• Weight: 84 g/m²
• Thickness: 0.16 mm

Fast 12 to 25µm
Black ribbon

• for coarse, high volume precipitates
• for determinations according to the German Standard Methods for the examination of water, waste water and sludge.
• most frequently used quantitative filter
• Weight: 80g/m²
• Thickness: 0.19mm

Recommended for the detection of very fine traces of light-coloured particles and precipitates.

• Made of pure celluloses and with constriction of black additives
• White and light-coloured particles can be detected easily by the strong contrast to the black filter paper
• Weight 95 g/m²
• Thickness 0,2 mm
• Filtration speed acc. to Herzberg 850 s

Ashless filters (approx. 0.004%), recommended for quantitative analysis, routine gravimetric tests and sample preparation for instrumental analysis.

• Acid-washed and rinsed with water to neutralise
• Free of minerals and metallic ions, ideal for the detection of metallic ions
• For analytical applications, routine quantitative and /or gravimetric procedures
• These filter papers are perfectly qualified for food control, beverage analysis and environmental monitoring

Data Printer, with GLP- and GMP-function for all Sartorius balances and moisture analysers. With alphanumeric dot-matrix printing unit (safety printing unit with 5x8 matrix) as well as the ASCII character set and application-specific special characters, for the documentation of weighing data. Membrane keyboard for easy and safe operation.

Medium-fast, smooth, ashless.

Cellulose materials used to coagulate precipitates and as a prefilter layer in funnels. Quantitative grade is used for filter aids except for ordinary clippings. Ashless.

Slow filtration. These ashless filter papers are used for quantitative and gravimetric analyses as well as for pressure and vacuum filtration.

Fast filtration, smooth, ashless. With elevated border.

A silicone impregnated, water repellent paper which can be used to separate aqueous solutions from immiscible solvents. The aqueous phase is retained and the organic phase passes through. Will retain solid particles. Can be used either flat under suction not exceeding 70mm Hg or quadrant folded in a conical glass funnel. Supplied in box of 100 circles.
Note: This paper contains a small quantity of tin complex catalyst. It is therefore not recommended for use when this complex may cause interference, e.g. with the use of dithizone (diphenylthiocarbazone) reagent.

Glass microfibre filters have a fast filtration and a high loading capacity and particle retention rate. Manufactured without chemical binder from high grade borosilicate glass. (Exception: GF6, GF9). They are suitable for gravity or low suction filtration. Filtration speeds generally very much higher than conventional cellulose papers. Efficient retention of micron size particles. Must be used flat. Ideal for use in flat perforated plate Buchner type funnels (not sintered glass models). Can be used up to 500°C
Wide range of applications including:

• retention of fine analytical precipitates
• retention of biochemical gelatinous precipitates
• water/air pollution analyses
• as prefilters for membranes
• scintillation counting
• radioimmunoassay.

Recommended for filtration of the finest semi-colloidal turbidities.

• For separation of very fine semi-colloidal turbidity
• Clarification of extracts of soil suspensions, of milk serum, of starch solutions and sugar-containing solutions prior to polarimetry and refractometry
• For retention of protein precipitates and slime particles from solutions
• Clarification of urine samples

The new grade MG 85/65 is the perfect solution for determining suspended solids in water according to the standard method DIN EN 872.
Thanks to our improved technology, MG 85/65 filter media are characterised by reduced fibre loss and improved strength, two important parameters that can influence the results of the test method.

Properties & Advantages:

• Improved performance
• Retention of very fine particles
• Processing of samples with high turbidity

Recommended for the clarifying filtration of beet extracts and juices prior to analysis.

• High filtration speed combined with high retention of particles
• Two surfaces are available: smooth or creped

Hardened ashless filters (approx. 0.002%), especially recommended for vacuum and pressure filtration, and for the use of acidic and alkaline solutions.

• Acid-washed and rinsed with water
• Free of minerals and metallic ions, ideal for the detection of trace metals
• High wet strength, easy to scrape off or wash off precipitates
• High resistance to aggressive chemical components, like sulphuric and nitric acids (up to 40 % at 50 °C) and alkalis (up to 10 % at 20 °C)

• Acid treated for high wet-strength and chemical resistance
• Large nominal particle retention rating of 22 µm
• Fast filtration speed (Herzberg filtration speed 39 s)
• High purity (0.015 % ash maximum)
• Compatible with Büchner funnel or Hirsch funnel applications

• High wet-strength
• High chemical resistance to strong acid and alkali suspensions
• Retention of gelatinous precipitate
• 22 µm nominal particle retention rating
• Fast flow rate (Herzberg filtration speed 34 s)
• Maximum of 0.006 % ash concentration

Hydrophobic, silicone-impregnated filter paper. Allows the aqueous phase of an emulsion or other mixture to be separated based on water affinity. Suitable for the analysis of dressings or sauces.