Description
A standard grade filter used when high flow rates in air pollution monitoring are required and the collection of fine particles is not critical. 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.
| Parameter |
Grade 4 Qualitative Filter Paper Standard Grade, Circle |
| Grade : |
Grade 4 |
| Grade Type : |
Standard |
| Diameter : |
27mm, 42.5mm, 47mm, 50mm, 70mm, 90mm, 110mm, 125mm, 150mm, 185mm, 240mm, 270mm, 320mm, 400mm |
| Typical Particle Retention in Liquid1 : |
25 µm |
| Nominal Thickness : |
210µm |
| Typical water flow rate2 : |
247 ml/min |
| Nominal Basis Weight : |
92g/m² |
| Nominal Air Flow Rate : |
4 s/100 ml/in² |
| Nominal Ash Content3 : |
0.06% |
| Material : |
Cellulose |
| Typical Trace Element Levels : |
Aluminium 3.6 µg/g Antimony less than 0.5 µg/g Arsenic less than 0.5 µg/g Barium less than 0.5 µg/g Boron less than 1 µg/g Calcium 27.5 µg/g Chromium 1 µg/g Copper 0.9 µg/g Iron 13.7 µg/g Lead less than 0.5 µg/g Magnesium 21 µg/g Manganese less than 0.5 µg/g Mercury less than 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. |
| Format : |
Circles |
| Dimensions : |
Ø27mm, Ø42.5mm, Ø47mm, Ø50mm, Ø70mm, Ø90mm, Ø110mm, Ø125mm, Ø150mm, Ø185mm, Ø240mm, Ø270mm, Ø320mm, Ø400mm |
- 1Particle retention rating at 98% efficiency.
- 2For 9 cm diameter
- 3Ash is determined by ignition of the cellulose filter at 900°C in air.
| Parameter |
Grade 4 Qualitative Filter Paper Standard Grade, Roll/Sheet |
| Grade : |
Grade 4 |
| Grade Type : |
Standard |
| Typical Particle Retention in Liquid1 : |
25 µm |
| Nominal Thickness : |
210µm |
| Typical water flow rate2 : |
247 ml/min |
| Nominal Basis Weight : |
92g/m² |
| Nominal Air Flow Rate : |
4 s/100 ml/in² |
| Nominal Ash Content3 : |
0.06% |
| Material : |
Cellulose |
| Typical Trace Element Levels: |
Aluminium 3.6 µg/g Antimony less than 0.5 µg/g Arsenic less than 0.5 µg/g Barium less than 0.5 µg/g Boron less than 1 µg/g Calcium 27.5 µg/g Chromium 1 µg/g Copper 0.9 µg/g Iron 13.7 µg/g Lead less than 0.5 µg/g Magnesium 21 µg/g Manganese less than 0.5 µg/g Mercury less than 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. |
| Format : |
Roll/Sheets |
| Dimensions : |
38 x 114 mm(roll), 460 x 570 mm (18.11 x 22.45 in – Sheet), 580 x 580 mm (23 x 23 in – Sheet) |
- 1Particle retention rating at 98% efficiency.
- 2For 9 cm diameter
- 3Ash is determined by ignition of the cellulose filter at 900°C in air.
