GR 2 4.25CM

Grade 2 Qualitative Filter Paper Standard Grade, circle, 42.5 mm
A standard grade filter used for monitoring specific contaminants in the atmosphere and in soil testing.
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 2: 8 µm
Slightly more retentive than Grade 1 with a corresponding increase in filtration time (i.e., slightly slower filtration speed). More absorbent than Grade 1. In addition to general filtration in the 8 µm particle size range, the extra absorbency is utilized, for example, to hold soil nutrient in plant growth trials. Also used for monitoring specific contaminants in the atmosphere and in soil testing. Also available prepleated as Grade 2V.


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.

Slightly more retentive than Grade 1 with a corresponding increase in filtration time (i.e., slightly slower filtration speed). More absorbent than Grade 1. In addition to general filtration in the 8 µm particle size range, the extra absorbency is utilized, for example, to hold soil nutrient in plant growth trials. Also used for monitoring specific contaminants in the atmosphere and in soil testing. Also available prepleated as Grade 2V.

Grade 2: 8 µm

Complete Packsize	100 Pieces
Diameter	42.5
Dimensions	Ø 42.5 mm
Format	Circles
Grade	Grade 2
Grade Type	Standard
Material	Cellulose
Nominal Air Flow Rate	20 s/100 ml/in²
Nominal Ash Content	0.06% Ash is determined by ignition of the cellulose filter at 900°C in air.
Nominal Basis Weight	97
Nominal Thickness	190
Typical Particle Retention in Liquid	8 µm Particle retention rating at 98% efficiency.
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
Typical Water Flow Rate (ml/min) for 9cm diameter	38