Macherey-Nagel glass fibre filter circles MN 85/90 BF, binder-free, 0.5 µm (Ø 5–270 mm), 150 mm
€150.50
% Manufacturer's RRP: €183.00 17% below manufacturer's RRP
- Binder-free glass fibre filter circles (MN 85/90 BF) made from 100 % pure borosilicate glass.
- Precise nominal retention capacity of 0.5 µm, ideal for the separation of ultrafine particles.
- Generically available in all standard diameters from 25 mm to 270 mm to suit any laboratory apparatus.
- Extreme thermal resistance up to 500 °C, perfect for gravimetric analysis and ashing.
- High chemical inertness limits the leaching of foreign substances into sensitive filtrates.
- High mechanical dirt-holding capacity minimises clogging in matrix-laden samples.
Product information "Macherey-Nagel glass fibre filter circles MN 85/90 BF, binder-free, 0.5 µm (Ø 5–270 mm), 150 mm"
Macherey-Nagel MN 85/90 BF glass fibre filter circles represent a high-purity, matrix-stable system solution for demanding filtration processes, gravimetric analyses and the highly efficient separation of ultrafine particles in laboratories, environmental analysis and industrial quality control. Manufactured from pure borosilicate glass fibres without any organic or inorganic binders (BF=binder-free), these depth filters offer high chemical inertness and contribute to low-contamination analytical results. The wide range of available diameters, from a delicate 25 mm up to a large-area 270 mm, enables good scalability for all standard Büchner funnel, suction and micro-weighing equipment.
Material-science purity and binder-free structure
The process-engineering heart of the MN 85/90 BF filters is their binder-free fibre architecture. As no chemical additives or acrylic resins are used at all during manufacture, the filter matrix remains stable even when filtering highly aggressive organic solvents, strong acids or mild alkalis. Any leaching of foreign substances from the material into the filtrate (which could interfere with sensitive downstream detection methods, such as HPLC, GC or ion chromatography) is largely avoided. Furthermore, the high purity of the borosilicate fibres is an advantage for use in microbiology and cell culture filtration.
Retention capacity and fluid dynamics
With a nominal retention capacity of 0.5 µm in liquid media, these glass fibre filters are ideally suited for the separation of the finest precipitates, colloidal suspensions and proteins. The three-dimensional depth filter structure not only traps particles on the surface but also embeds them within the fibre mesh. This results in an exceptionally high dirt-holding capacity and prevents premature clogging of the filter, even with samples containing high levels of matrix material such as wastewater, slurries or extracts. At the same time, a high flow rate is achieved, which shortens filtration times with frequent use.
Thermal resistance and versatile environmental analysis
From a thermodynamic perspective, the MN 85/90 BF filter paper circles are characterised by high temperature resistance of up to 500 °C. This thermal stability makes them suitable for standard gravimetric methods, such as the determination of filterable substances (dry residue) and loss on ignition according to national and international environmental standards. The filters can be dried in a drying oven or ashed in a muffle furnace without the fibre structure collapsing. Typical areas of application include not only wastewater and drinking water monitoring but also air pollution control, the protection of membrane filters against clogging (pre-filtration) and the clarification of viscous phases.
Technical details
Metrology & filter specifications
- Filter type: Glass fibre filter paper circle / depth filter
- Quality / Grade: MN 85/90 BF
- Binder: binder-free (BF)
- Nominal retention capacity (liquid): 0.5 µm
- Retention capacity (air/gas): Higher (due to diffusion and interception mechanisms)
- Filtration characteristics: Very high flow rate with maximum particle retention
Material properties & resilience
- Base material: High-purity borosilicate glass fibre mesh
- Chemical resistance: Universally resistant to organic solvents, acids and mild alkalis
- Thermal stability: Up to 500 °C (can be ashed / resistant to ignition)
- Biological reactivity: Inert (no breeding ground for microorganisms)
Dimensions & range of variants
- Available diameters: 25 mm to 270 mm (selectable according to application)
- Filter shape: Filter paper circles (pre-cut, flat)
- Delivery form: Usually in a practical carton (quantity varies depending on diameter, usually 100 pieces)
Scope of delivery
- 1 x pack of Macherey-Nagel MN 85/90 BF glass fibre filter circles in the selected diameter variant
Important note: Vacuum filtration units, Büchner funnels, suction flasks and suitable rubber sleeves (Guko) are not included in the scope of delivery and must be adapted separately to the specific workstation.
Individual requirements & accessories
To realise the full potential of the Macherey-Nagel MN 85/90 BF filters, their use in professional vacuum filtration set-ups is recommended. Our laboratory range includes suitable porcelain and stainless steel Büchner funnels, as well as glass filtration apparatus with frit supports. For the precise handling of damp filter paper circles without damaging the fibre structure, we recommend the use of rounded stainless steel laboratory tweezers. Should you require filters with a different retention capacity or integrated organic binders for your analytical work, we also offer the complete Macherey-Nagel filter range (e.g. MN 85/70 or membrane filters). Please make use of our technical procurement service to design your filtration workstations to suit your specific requirements.
| Diameter: | 150 mm |
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