Whatman Grade 4 Qualitative Filter Papers

Whatman Grade 4 Qualitative Filter Papers

A standard grade filter used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

These cellulose filters are used in qualitative analytical techniques to determine and identify materials. Prepleated qualitative filters are also available, which give improved flow rate and increased loading capacity compared to equivalent flat filters.

Grade 4: 25 µm

Extremely fast filtering with excellent retention of coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide. Very useful as a rapid filter for routine clean-up of biological fluids or organic extracts during analysis. Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

Specification
Grade :Grade 4
Grade Type :Standard
Typical Particle Retention in Liquid1 :25 µm
Nominal Thickness :210 µm
Typical water flow rate2 :247 ml/min
Nominal Basis Weight :92 g/m²
Nominal Air Flow Rate :4 s/100 ml/in²
Nominal Ash Content :0.06%
Material :Cellulose
Typical Trace Element Levels :Aluminium 3.6 µg/g Antimony <0.5 µg/g Arsenic <0.5 µg/g Barium <0.5 µg/g Boron <1 µg/g Calcium 27.5 µg/g Chromium 1 µg/g Copper 0.9 µg/g Iron 13.7 µg/g Lead <0.5 µg/g Magnesium 21 µg/g Manganese <0.5 µg/g Mercury <0.5 µg/g Potassium 6.2 µg/g Silicon 8.8 µg/g Sodium 32.3 µg/g Zinc 58.3 µg/g
Application :Used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical.

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