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Whatman filter paper # 4 - discs and flat sheets

grade 4:20-25 a


Filter paper that allows extremely fast filtration with excellent retention of coarse particles and gelatinous precipitates such as iron hydroxide and aluminum hydroxide.

In the analytical process it is very useful as a quick filter for the routine purification of biological solutions or organic extracts.

It is used in monitoring air pollutants for which high filtration rates are required and the collection of fine particles is not a critical factor.

Grade 4: 20-25 µm

Technical features

Degree

Grade 4

Nominal retention of particles in liquids (at 98% efficiency)

20-25 µm

Nominal thickness

210 µm

Typical water flow

247 ml / min

Nominal base weight

92 g / m²

Nominal air flow

4 s / 100 ml / in (for 9 cm diameter)

Nominal ash content

(determined by

incineration of the filter at 900 ° C

in the air)

0.06%

Material

Cellulose

Typical tracks element layers

Aluminum 3.6 µg / g Antimony <0.5 µg / g Arsenic <0.5 µg / g Barium <0.5 µg / g Boron

Applications

Used when high flow rates are required in air pollution monitoring and the collection of fine particles is not critical.

Format

Discs

Pieces per pack

100 pieces

Code Description
481004042 Whatman filter paper n.4 - flat discs diam. 42.5 mm
481004047 Whatman filter paper n.4 - flat discs diam. mm 47
481004050 Whatman filter paper n.4 - flat discs diam. 50 mm
481004055 Whatman filter paper n.4 - flat discs diam. 55 mm
481004070 Whatman filter paper n.4 - flat discs diam. 70 mm
481004090 Whatman filter paper n.4 - flat discs diam. 90 mm
481004110 Whatman filter paper n.4 - flat discs diam. 110 mm
481004125 Whatman filter paper n.4 - flat discs diam. 125 mm
481004150 Whatman filter paper n.4 - flat discs diam. 150 mm
481004185 Whatman filter paper n.4 - flat discs diam. 185 mm
481004240 Whatman filter paper n.4 - flat discs diam. 240 mm
481004270 Whatman filter paper n.4 - flat discs diam. 270 mm
481004320 Whatman filter paper n.4 - flat discs diam. 320 mm
481004325 Whatman filter paper n.4 - flat discs diam. 25 mm
481004327 Whatman filter paper n.4 - flat discs diam. 27 mm
481004400 Whatman filter paper n.4 - flat discs diam. 400 mm
481004917 Whatman filter paper n.4 - flat sheets 460x570 mm
481004930 Whatman filter paper n.4 - flat sheets 580x580 mm

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10127 Torino Italy
Tel. +39 011 3160808
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