Macherey-Nagel filter paper circles MN 619 qualitative, slow-filtering, smooth (Ø 55–500 mm), 320 mm
€47.20
% Manufacturer's RRP: €59.00 20% below manufacturer's RRP
- High-quality Macherey-Nagel MN 619 filter paper circles for the qualitative separation of fine particles
- Slow filtration speed (100 s) supports high retention of fine crystalline precipitates
- Smooth surface geometry enables easy and residue-free removal of the filter cake
- High wet tear strength ensures the structural integrity of the cellulose non-woven during the filtration process
- A scalable range of sizes from 55 mm to 500 mm in diameter accommodates any funnel and laboratory geometry
Product information "Macherey-Nagel filter paper circles MN 619 qualitative, slow-filtering, smooth (Ø 55–500 mm), 320 mm"
The Macherey-Nagel MN 619 filter paper circles represent a structurally optimised and process-proven system solution for qualitative filtration in everyday laboratory work. Available in a wide range of diameters, from 55 mm for compact standard funnels up to 500 mm for high-volume separation processes, this filter series caters for every scale in chemistry, the pharmaceutical industry, environmental analysis and industrial quality control. Wherever fine-particle suspensions need to be clarified or demanding samples prepared, this slow-filtration quality enables gentle, particle-free and process-reliable working.
Maximum particle retention thanks to a dense fibre structure
The technological foundation of the MN 619 filter paper circles is based on refined cellulose and linter fibres, which are processed into a homogeneous, close-meshed structure. The slow filtration speed of around 100 seconds (according to the manufacturer’s specifications), from which the filter takes its name, results from the high density of the pore structure. This geometric structure ensures that even fine crystalline precipitates and microparticles are reliably retained on the filter surface. The risk of a transient particle flow through the filter medium is thus effectively minimised, which reliably safeguards the validity of subsequent qualitative analyses.
Smooth surface geometry for residue-free separation
From a materials science perspective, the completely smooth surface of the filter paper circle offers significant functional advantages in sample preparation. Unlike creped variants, fine precipitates on the smooth structure do not tend to become lodged in fibre recesses. This noticeably facilitates the subsequent mechanical removal or washing out of the filter cake. Furthermore, the material is characterised by high purity and a low ash content for qualitative filter papers, thereby gently preventing unwanted chemical interactions with the sample medium or solvent extractions.
High wet strength for reproducible laboratory processes
Despite being based on pure cellulose without synthetic stabilisers, the MN 619 filter paper circles exhibit remarkable inherent mechanical stability when wet. The three-dimensional depth structure remains completely dimensionally stable even under the hydrostatic pressure of a fully filled funnel. For laboratory managers and quality management personnel in regulated environments, Macherey-Nagel offers, with this standardised fibre grade, a documentation basis for recurring routine filtrations in GLP environments.
Technical details
Materials science & filter structure
- Filter type: Qualitative filter paper circle / paper filter
- Grade / Quality level: MN 619
- Material composition: High-purity cellulose and refined linter fibres
- Surface texture: Smooth, uniformly structured
- Colour: White
- Filtration speed: Slow (approx. 100 seconds according to the manufacturer’s specifications)
- Intended use: Separation of fine-crystalline and very fine precipitates
Physical properties
- Grammage: approx. 85 grams per square metre (85 g/m²)
- Filter thickness: approx. 0.17 mm (millimetres)
- Fibre shedding: Extremely low due to dense fibre bonding
- Chemical resistance: Inert to mild acids, alkalis and common organic solvents
Dimensions & range of variants
- Available diameter range: 55 mm to 500 mm
- Common diameters: 55, 70, 90, 110, 125, 150, 185, 240, 320, 400, 500 mm
- Cut: Geometrically precise, fibre-free circular cut
- Hazard classification: Not classified as a hazardous substance under GHS guidelines; safe to handle
Scope of delivery
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1 x pack of Macherey-Nagel filter paper circles, grade MN 619, smooth (standard contents: 100 pieces per box) in the diameter selected by the customer (55 mm to 500 mm).
Individual requirements & accessories
To ensure the optimal integration of Macherey-Nagel filter paper circles into your daily laboratory routine, we offer a comprehensive range of complementary accessories. For standard filtration, our portfolio includes robust glass funnels, polypropylene funnels, as well as suitable laboratory stands and funnel holders. For contamination-free and gentle handling of the wet filter paper circles, we recommend the use of flat-tipped filter tweezers made from high-alloy, corrosion-resistant stainless steel. For subsequent drying or storage processes, we also offer chemically inert Petri dishes, watch glasses and desiccators. Please make use of our technical procurement service to design your filtration workstations to suit your specific requirements.
| Diameter: | 320 mm |
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