Whatman Grade No.1 Qualitative Filter Paper Circles
A Grade 1 standard grade Qualitative Filter Paper circle.
A widely used standard grade filter paper for routine applications with medium retention and flow rate.
It covers a wide range of laboratory applications and is frequently used for clarifying liquids.
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.
Typical Particle Retention in Liquid 11 µm
- Nominal Thickness 180 µm Nominal Basis Weight 87 g/m2 Nominal Air Flow Rate 13 s/100 ml/in2 Nominal Ash Content 0.06%2) 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 1)Particle retention rating at 98% efficiency.
- Ash is determined by ignition of the cellulose filter at 900°C in air.
