Grade 41 Fast Ashless Filter Paper

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.

• 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

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.

Grade 41: 20 µm

Specifications:

• Grade: Grade 41
• Format: Circles/Sheet
• Type: Ashless
• Typical Particle Retention in Liquid: 20 µm
• Typical Water Flow Rate (ml/min) for 9cm diameter: 254
• Nominal Thickness: 215 µm
• Nominal Basis Weight: 85 g/m²
• Nominal Air Flow Rate: 4s/100mL/in²
• Nominal Ash Content: 0.007%
• Material: High-quality cotton linters
• Alpha Cellulose Content Min.: ≥98%
• Typical Trace Element Levels: Aluminium 2.5 µg/g, Antimony <0.5 µg/g, Arsenic <0.5 µg/g, Barium <0.5 µg/g, Boron <1 µg/g, Calcium 8.3 µg/g, Chromium 1.5 µg/g, Copper 2 µg/g, Iron 12 µg/g, Lead <0.5 µg/g, Magnesium 4 µg/g, Manganese <0.5 µg/g, Mercury <0.5 µg/g, Potassium 2.3 µg/g, Silicon 6.2 µg/g, Sodium 16.8 µg/g, Zinc 64.5 µg/g

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