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Whatman Grade 4 Qualitative Filter Papers

Whatman Grade 4 Qualitative Filter Papers (20-25 ┬Ám particle retention) are a standard grade, high flow rate filter paper. They are useful in qualitative analytical separations when fast flow is required and the collection of fine particles is not critical.
These cellulose filters are used in qualitative analytical techniques to determine and identify materials (e.g., in air pollution monitoring).
They are also available as pre-pleated filters, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

  • Extremely high flow rate
  • Excellent retention: captures coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxideFast filtration: useful for routine clean-up of biological fluids or organic extracts during analysis
Part NumberDiameterQuantityPrice
1004-027 27 mmPack/400$88.49
1004-042 42.5 mmPack/100$15.51
1004-047 47 mmPack/100$17.71
1004-050 50 mmPack/100$19.89
1004-055 55 mmPack/100$19.92
1004-070 70 mmPack/100$19.92
1004-090 90 mmPack/100$24.40
1004-110 110 mmPack/100$30.99
1004-125 125 mmPack/100$39.75
1004-150 150 mmPack/100$50.85
1004-185 185 mmPack/100$75.27
1004-240 240 mmPack/100$128.27
1004-270 270 mmPack/100$168.23
1004-320 320 mmPack/100$241.49
1004-400 400 mmPack/100$357.60