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  • Z240648 - Whatman® qualitative filter paper, Grade 4

Z240648 Aldrich

Whatman® qualitative filter paper, Grade 4

circles, diam. 500 mm, pack of 100

Synonym: filter papers



Related Categories Filtration Supplies, Labware, Paper Filters, Qualitative
material   circles
packaging   pack of 100
mfr. no.   Whatman, 1004-500
parameter   0.22 psi wet burst
  37 sec/100 mL speed (Herzberg)
diam.   500 mm
thickness   205 μm
ash   ≤0.06%
pore size   20-25 μm (Particle retention)
basis weight   92 g/m2


General description

These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

Grade 4: 20-25 μm, (very fast filter paper)

Extremely fast filtering with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide. Very useful as a rapid filter for routine clean-up of biological fluids or organic extracts during analysis. Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

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Whatman is a registered trademark of GE Healthcare

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