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Whatman™ 1441-320
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Whatman™ Grade 41 Ashless Quantitative Filter Paper, 320 mm dia

Quantitative Filter Paper, 320 mm dia, Cotton Linters, Grade 41, Ashless Grade Type, Circle Format, 215 µm Thickness, 20 µm Particle Retention in Liquid, 85 g/m2 Nominal Basis Weight, 54 secs/100 ml (Herzberg) Filtration Speed

  • Manufacturer Part No: 1441-320
  • SECO Part No: 12-4830-11
  • Sold As:
  • Availability: loading

GE's Whatman Grade 41 environmental pollution papers are among the fastest filter papers in the Whatman ashless range. This gravimetric filter is well suited for quantitative analysis of soil and air. Aside from Grade 41 environmental pollution papers, Whatman quantitative paper comes in a variety of particle retentions, filtration speeds, and filter thicknesses to provide you with the appropriate filter for your precipitate. Also see our hardened ashless grades for analysis requiring the use of strong acids or bases. Whatman Grade 41 filters from GE Healthcare's Life Sciences business are suitable for quantitative air pollution analysis as a paper tape for impregnation when determining gaseous compounds at high flow rates. Grade 41 filters are also commonly used in preparing solid environmental samples (e.g., soils, sludges) for metals analysis after nitric acid digestion. Grade 41 is available in a convenient, disposable, 47 mm filter funnel with a 250 ml capacity. The 47 mm diameter filter can be easily removed for further analysis or culturing.

Diameter : 320 mm
Grade : Grade 41
Material (ml/min) : High-quality Cotton Linters
Ash Content : 0.007%
Sterility : Non-sterile
Grade Type : Ashless
Type : Quantitative
Dry Burst Pressure : 69 kPa/10 psi
Filtration Speed : 54 sec/100 ml (Herzberg)
Format : Circle
Nominal Air Flow Rate : 4 sec/100 ml/in2
Nominal Basis Weight : 85 g/m2
Particle Retention in Liquid : 20 µm
Properties : Fast
Thickness : 215 µm
Typical Water Flow Rate : 254 ml/min
Wet Burst Pressure : 1.5 kPa/0.22 psi
Alpha Cellulose Content : =98%
Loading Capacity : N
  • Extremely low ash content (0.007% ash maximum)
  • 20 µm Nominal particle retention rating
  • Fast filtration speed (Herzberg 54 s)
  • Commonly used for routine air pollution analysis and soil pollution analysis
  • Designed for gravimetric analysis and the preparation of samples for instrumental analysis, for analytical procedures involving coarse particles or gelatinous precipitates (e.g., iron or aluminum hydroxides)
  • Also used in quantitative air pollution analysis as a paper tape for impregnation when determining gaseous compounds at high flow rates

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