WHATMAN: Grade 4 Qualitative Filter Paper

Grade 4 is a fast filter material that is well suited for retention of coarse particles and gelatinous precipitates, such as ferric hydroxide and aluminum hydroxide.

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 um (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.

Properties

  • – Particle retention: 25µm
  • – Nominal thickness: 210 µm
  • – Nominal basis weight: 92 g/m2
  • – Nominal ash content: 0.06%

Applications

  • – Air pollution monitoring where the collection of fine particles is not critical
  • – Routine clean-up of biological fluids or organic extracts

Available Sizing

CODESizing DescriptionPack Size
1004-02727 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 27 mm400 ea
1004-04242.5mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 42.5 mm100 ea
1004-04747 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 47 mm100 ea
1004-05050 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 50 mm100 ea
1004-05555 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 55 mm100 ea
1004-07070 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 70 mm100 ea
1004-09090 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 90 mm100 ea
1004-110110 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 110 mm100 ea
1004-125125 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 125 mm100 ea
1004-150150 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 150 mm100 ea
1004-185185 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 185 mm100 ea
1004-240240 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 240 mm100 ea
1004-270270 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 270 mm100 ea
1004-320320 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 320 mm100 ea
1004-400400 mm diaWhatman® qualitative filter paper, Grade 4, circles, diam. 400 mm100 ea
1004-917460 mm × 570mmWhatman® qualitative filter paper, Grade 4, sheets, W × L 460 mm × 570 mm100 ea
1004-930580 mm × 580 mmWhatman® qualitative filter paper, Grade 4, sheets, W × L 580 mm × 580100 ea
1004-64838 mm × 114mmWhatman® qualitative filter paper, Grade 4, roll, W × L 38 mm × 114 mm1 ea

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