Macherey-Nagel MN 85/90 round glass fibre filter with binder, 0.5 µm (Ø 25–320 mm), 45 mm
€20.90
% Manufacturer's RRP: €25.50 18% below manufacturer's RRP
- Macherey-Nagel MN 85/90 glass fibre filter for general and demanding laboratory filtration applications
- An integrated organic binder gives the smooth non-woven fabric outstanding mechanical wet tear strength
- Average retention capacity of 0.5 micrometres
- Thermally stable up to 200 °C, ideal for drying and heating processes in laboratory ovens
- A range of sizes from 25 mm to 320 mm in diameter caters for any funnel or suction filter geometry
Product information "Macherey-Nagel MN 85/90 round glass fibre filter with binder, 0.5 µm (Ø 25–320 mm), 45 mm"
Macherey-Nagel glass fibre filter circles MN 85/90 of established premium quality are used for clarification, particle separation and sample preparation in modern day-to-day laboratory work. Available in a wide range of diameters, scalable to suit specific applications, from 25 mm for compact in-line filtration systems up to large-area 320 mm for high-volume funnel and Büchner set-ups, this series caters for all scale levels of analytical and process engineering applications. As a glass fibre filter for general laboratory applications, this filter fleece is employed wherever excellent flow rates must be combined with outstanding mechanical strength in order to separate particle-rich media gently and reliably.
Outstanding mechanical stability thanks to organic binders
The unique technological feature of the MN 85/90 grade is based on the targeted combination of high-purity borosilicate glass microfibres with a specialised organic binder. Whilst binder-free glass fibre filters may be prone to fibre shedding under intense fluid-mechanical stress or strong mechanical shear, the binder matrix permanently stabilises the fibre structure. This gives the smooth filter paper circle remarkable tear resistance and inherent stability when wet. With a filter thickness of 0.6 mm and a defined grammage of 90 grams per square metre (90 g/m²), the filter’s three-dimensional depth structure remains completely dimensionally stable even under high filtration pressure, which reliably prevents transient filter breakthrough.
Highly efficient separation and rapid filtration kinetics
From a metrological perspective, the MN 85/90 filter offers an average retention capacity of 0.5 micrometres. This fine pore structure makes the filter medium particularly well suited to the reliable separation of the finest precipitates, microparticles and macromolecular aggregates. Despite this high retention capacity, the high porosity of the glass fibre fleece ensures a remarkable hydrodynamic flow rate: With a standardised filtration speed of 15 seconds, flow resistance is minimised, thereby significantly speeding up time-critical routine analyses and high-throughput filtration. Undesirable clogging effects (blocking) in heavily particle-laden sample flows, such as wastewater or sludge samples, are reduced gently, without damaging the material.
Thermal resistance and comprehensive quality management
The thermodynamic limit of the MN 85/90 filter is set at a maximum temperature of 200 °C due to the organic binder component. Up to this threshold, the material remains structurally stable, chemically inert and colourfast (pure white). The filter’s smooth surface prevents irreversible adsorption of sample components and allows for residue-free handling. For laboratory managers and quality management officers in regulated environments, Macherey-Nagel’s range provides a basis for recurring test processes in GLP and GMP environments.
Technical details
Material science & filter structure
- Filter type: Glass fibre depth filter / filter paper circle
- Grade / Quality level: MN 85/90
- Material basis: High-purity borosilicate glass microfibres
- Binder status: With organic binder (for maximum mechanical strength)
- Surface finish: Smooth, uniformly structured
- Colour: White
- Nominal retention capacity: 0.5 micrometres
Physical & kinetic properties
- Grammage: approx. 90 grams per square metre (90 g/m²)
- Filter thickness: approx. 0.6 mm (millimetres)
- Filtration speed: 15 seconds (typical value according to the manufacturer’s data sheet)
- Thermal stability: Remains stable up to a maximum of 200 °C (392 degrees Fahrenheit)
Dimensions, logistics & compliance
- Available diameter range: 25 mm to 320 mm
- Common diameter variants: 25, 37, 45, 55, 70, 90, 110, 125, 150, 185, 240, 270, 320 mm
- Hazardous substance status according to GHS: Not a hazardous substance; completely safe to handle
- Quality management: Supports standardised, reproducible routine filtration processes in GLP environments
Scope of delivery
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1 x pack of Macherey-Nagel glass fibre filter paper circles, grade MN 85/90, with binder (standard quantity: 100 pieces per box) in the diameter selected by the customer (25 mm to 320 mm).
Individual requirements & accessories
For optimal integration of Macherey-Nagel glass fibre filters into your daily laboratory practice, we offer a comprehensive range of complementary peripherals. For classic vacuum or Büchner filtration, our portfolio includes robust porcelain Büchner funnels, matching suction flasks made from thick-walled borosilicate glass, and complete multi-filter units made from stainless steel. For contamination-free and gentle handling of the delicate filter discs, we recommend the use of filter tweezers with flat, rounded tips made from high-alloy, corrosion-resistant stainless steel. For subsequent drying processes until a constant weight is achieved at temperatures of up to 200 °C, we also offer chemically inert Petri dishes and desiccators. Please make use of our technical procurement service to design your filtration workstations to suit your specific requirements.
| Diameter: | 45 mm |
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