Macherey-Nagel glass fibre filter circles MN 85/90, 0.5 µm

Product information "Macherey-Nagel glass fibre filter paper circles MN 85/90 with binder, 0.5 µm (Ø 25–320 mm), 185 mm"

The Macherey-Nagel MN 85/90 glass fibre filter circles are intended for general laboratory filtration. They consist of borosilicate glass microfibres with an organic binder, have a smooth, white surface and a thickness of 0.6 mm. The average retention capacity is 0.5 µm and the filtration speed is 15 s. One pack contains 100 filters, and 13 diameters from 25 to 320 mm are available.

Glass fibre filter circles with and without binder

The organic binder holds the glass fibres together. According to Macherey-Nagel, this gives the filter comparatively high mechanical stability. The binder-free counterpart MN 85/90 BF has the same retention capacity of 0.5 µm and the same grammage of 90 g/m². At 0.51 mm it is slightly thinner than the MN 85/90 at 0.6 mm, and it withstands 500 °C, whereas the MN 85/90 withstands only 200 °C.

If you only filter off the residue and dry it at up to 200 °C, the filter with binder is sufficient. For higher temperatures and for aggressive solutions, the BF version is the better choice because it contains no organic component.

MN 85/90 or MN 85/70

The MN 85/70 is also a glass fibre filter with an organic binder and a filtration speed of 15 s. At 0.6 µm it retains more coarsely, weighs 73 g/m² and is 0.42 mm thick. The MN 85/90 is therefore finer, heavier and thicker. If the finer retention of 0.5 µm matters, the MN 85/90 is the suitable type.

Typical applications

Clarification filtration of solutions, extracts and digests before analysis
Separation of precipitates and solids in vacuum filtration
Prefiltration of samples that would quickly clog a membrane filter
Routine filtration in the laboratory up to 200 °C

Available diameters

The diameter depends on the funnel or filter holder. The filter circle should cover the perforated plate completely without standing up at the edge. All 13 diameters are listed in the table with the manufacturer’s item number.

Diameter	Pieces per pack	MPN
25 mm	100	4050025
37 mm	100	4050037
45 mm	100	4050045
55 mm	100	405005
70 mm	100	405007
90 mm	100	405009
110 mm	100	405011
125 mm	100	405012
150 mm	100	405015
185 mm	100	405018
240 mm	100	405024
270 mm	100	405027
320 mm	100	405032

Technical details

All figures are typical values according to Macherey-Nagel and not a specification.

Type	MN 85/90
Material	Borosilicate glass microfibres
Binder	organic
Average retention capacity	0.5 µm
Grammage	90 g/m²
Thickness	0.6 mm
Filtration speed	15 s
Maximum temperature	200 °C
Surface	smooth
Colour	white
Shape	filter circle
Diameter	25 to 320 mm
Pack contents	100 pieces

Scope of delivery

1 pack containing 100 MN 85/90 glass fibre filter circles in the selected diameter

Individual requirements and procurement service

Büchner funnels, suction flasks, filter tweezers and vacuum pumps are also available. Enquiries about accessories, other types or larger quantities are handled by our procurement service.

Diameter:	185 mm