WHATMAN Grade 40 Quantitative Filter Paper, Ashless

GE Healthcare Life Sciences
The classic general purpose ashless filter paper with medium speed and retention. Typical applications include gravimetric analysis for numerous components in cements, clays, iron, and steel products; as a primary filter for separating solid matter from aqueous extracts in general soil analysis; quantitative determination of sediments
in milk, and as a pure analytical grade clean-up filter for solutions prior to AA spectrometry. Also used as a high-purity filter in the collection of trace elements and radionuclides from the atmosphere.
• Typical Properties
Description Medium flow
Particle Retention in Liquid (μm) 8
Filtration Speed (approx) Herzberg (s) -
Normal ash content (%) 0.007
Typical Thickness (μm) 210
Basis Weight (g/m2) 95
Typical water flow rate (ml/min)2 25
Nominal air flow rate (s/100 mL/in2) 21

• Ordering Information – Qualitative Filter Circles

Diameter (mm)

Catalog Number

Quantity/Pack

12.7

1440-012

400

30

1440-329

100

32

1440-032

100

42.5

1440-042

100

47

1440-047

100

55

1440-055

100

70

1440-070

100

90

1440-090

100

110

1440-110

100

125

1440-125

100

150

1440-150

100

185

1440-185

100

240

1440-240

100

320

1440-320

100

450

1440-6168

100

460 x 570

1440-917

100


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