Grade 41 Fast Ashless Filter Paper, Circle & Sheet

Description

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

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.

Fast ashless paper for pollution analysis

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.

Parameter	Grade 41 Fast Ashless Filter Paper, Circle & Sheet
Grade :	Grade 41
Grade Type :	Ashless
Typical Particle Retention in Liquid¹ :	20 µm
Nominal Thickness :	215 µm
Typical water flow rate²:	254 ml/min
Nominal Basis Weight :	85 g/m²
Nominal Air Flow Rate :	4 s/100 mL/in²
Nominal Ash Content³ :	0.007%
Material :	High-quality cotton linters
Alpha Cellulose Content Min. :	≥98%
Typical Trace Element Levels:	Aluminium 2.5 µg/g Antimony less than 0.5 µg/g Arsenic less than 0.5 µg/g Barium less than 0.5 µg/g Boron less than 1 µg/g Calcium 8.3 µg/g Chromium 1.5 µg/g Copper 2 µg/g Iron 12 µg/g Lead less than 0.5 µg/g Magnesium 4 µg/g Manganese less than 0.5 µg/g Mercury less than 0.5 µg/g Potassium 2.3 µg/g Silicon 6.2 µg/g Sodium 16.8 µg/g Zinc 64.5 µg/g
Application :	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.
Format & Dimensions :	Circle – Ø25 mm, Ø32 mm, Ø42.5 mm, Ø47 mm, Ø50 mm, Ø55 mm, Ø60 mm, Ø70 mm, Ø90 mm, Ø110 mm, Ø125 mm, Ø150 mm, Ø185 mm, Ø240 mm, Ø320 mm Sheet – 203 x 254 mm, 460 x 570 mm
Pack Size :	100 pieces – 25 mm, 32 mm, 42.5 mm, 47 mm, 50 mm, 60 mm, 70 mm, 90 mm, 110 mm, 125 mm, 150 mm, 185 mm, 240 mm, 320 mm, 203 x 254 mm, 460 x 570 mm 10000 pieces – 55 mm