Filter paper, quantitative

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.

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

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.