Macherey-Nagel MN GF-1 round glass fibre filter, binder-free, 0.7 µm (Ø 25–270 mm)
€81.90
% Regular price: €99.20 (17% saved)
- Pure borosilicate glass without binders
- Sub-micron retention capacity: 0.7 micrometres
- Thermodynamically stable up to 500 degrees
- High contaminant retention capacity due to depth filtration
- Ideal matrix for gravimetric analysis of suspended solids
- Available in a range of diameters
Product information "Macherey-Nagel MN GF-1 round glass fibre filter, binder-free, 0.7 µm (Ø 25–270 mm)"
Fluid mechanics and submicron depth filtration
In instrumental analysis and gravimetry, the separation kinetics of glass fibre filters differ fundamentally from those of conventional cellulose-based surface filters (sieve effect). The Macherey-Nagel MN GF-1 operates according to the process principle of depth filtration. The matrix consists of a complex, three-dimensional lattice of ultra-fine borosilicate glass microfibres. When a differential pressure is applied (vacuum filtration), particulate contaminants penetrate deep into the filter’s internal hollow structure, where they are retained by macromolecular adhesion and mechanical interception. This three-dimensional contaminant retention architecture generates a massive contaminant holding capacity and prevents premature hydrodynamic clogging of the filter. With a high-precision nominal retention capacity of 0.7 µm, the MN GF-1 guarantees the quantitative retention of the finest precipitates, bacteria or suspended solids whilst maintaining an excellent volumetric flow rate.
Thermodynamic stability and chemical inertness
The gravimetric determination of organic or inorganic fractions (such as suspended solids in accordance with EN 872) often requires extensive thermodynamic drying processes. The key metrological advantage of the MN GF-1 is that it is completely free of binders (binder-free). Whilst conventional filters are structurally bonded using organic adhesives, the integrity of this filter is based purely on the mechanical interlacing of the glass fibres. This purity in terms of materials science allows the filter to be exposed to extreme temperatures of up to 500 °C without the matrix suffering thermal degradation or organic binders outgassing, which would distort the mass spectrometric or gravimetric blank value. The borosilicate glass is also completely inert to almost all aggressive solvents, strong acids and bases (with the notable exception of hydrofluoric acid and highly concentrated hot alkalis).
Metrological integrity and capillary retention
The combination of chemical inertness, high permeability and submicron retention makes the GF-1 the process standard in water and wastewater analysis, protein precipitation and cell harvesting. The extremely high specific surface area of the borosilicate fibres also enables efficient capillary absorption of liquid media. By eliminating cellulose-based matrices, any microbial growth on the filter surface is physically prevented, thereby ensuring the complete integrity of the retained biological or chemical fractions right through to the final spectroscopic or gravimetric analysis.
Technical details
Materials Science & Thermodynamics
- Filter matrix: 100% pure borosilicate glass (microfibres)
- Binder: Completely binder-free
- Thermodynamic stability (temperature resistance): Up to approx. 500 °C
- Chemical inertness: Highly resistant to solvents, acids and bases (except hydrofluoric acid/HF)
Metrology & Fluid Mechanics
- Filtration mechanism: Three-dimensional depth filtration
- Nominal retention capacity (particle size): 0.7 µm
- Gramme per square metre: approx. 55 g/m²
- Matrix thickness: approx. 0.22 mm
- Flow rate: Very high (in relative terms to the submicron pore size)
Geometry & format
- Product type: Round filter (die-cut)
- Available diameters (variables): 25 mm, 37 mm, 45 mm, 47 mm, 55 mm, 70 mm, 90 mm, 110 mm, 125 mm, 150 mm, 185 mm, 240 mm, 270 mm
Contents
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1 x Macherey-Nagel glass fibre round filter MN GF-1 folding box (100 pieces; may vary for extremely large diameters)
(Important note: This is a product with variations. The exact geometric dimensions must be metrologically adapted to the existing filtration equipment prior to purchase!)
Custom requirements & accessories
Due to the absence of binding agents, the GF-1 glass fibre round filters have lower structural flexural strength than cellulose filters and must not be creased (pleated filter construction). They are strictly intended for flat-bed filtration in process engineering. To generate the hydrodynamic differential pressure, you will require suitable vacuum filtration equipment (such as a Büchner funnel made of porcelain or glass frit), a suction flask and a chemical-resistant diaphragm vacuum pump. When selecting the size, ensure that the circular filter completely covers the perforated base of the funnel without rising up at the edges, in order to prevent a bypass flow (leakage). Please feel free to contact our procurement service at any time for assistance with configuring your vacuum setup.
| Durchmesser: | 110 mm |
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