Whatman™ Quantitative filter papers, ashless, Grade 41

Whatman™ Grade 41 environmental pollution papers are among the fastest filter papers in the Whatman™ ashless range and are 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 Also used for preparing solid environmental samples for metals analysis after nitric acid digestion