Whatman™ Grade 4 Standard Qualitative Filter Paper, 90 mm dia
Qualitative Filter Paper, 90 mm dia, Cellulose, Grade 4, Standard Grade Type, Circle Format, 210 µm Thickness, 25 µm Particle Retention in Liquid, 92 g/m2 Nominal Basis Weight, 37 secs/100 ml (Herzberg) Filtration Speed
- Manufacturer Part No: 1004-090
- SECO Part No: 12-4710-04
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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.
| Diameter | : | 90 mm |
| Grade | : | Grade 4 |
| Material (ml/min) | : | Cellulose |
| Ash Content | : | 0.0006% |
| Grade Type | : | Standard |
| Type | : | Qualitative |
| Dry Burst Pressure | : | 69 kPa/10 psi |
| Filtration Speed | : | 37 sec/100 ml (Herzberg) |
| Format | : | Circle |
| Nominal Air Flow Rate | : | 4 sec/100 ml/in2 |
| Nominal Basis Weight | : | 92 g/m2 |
| Particle Retention in Liquid | : | 25 µm |
| Thickness | : | 210 µm |
| Typical Water Flow Rate | : | 247 ml/min |
| Wet Burst Pressure | : | 1.5 kPa/0.22 psi |
| Loading Capacity | : | N |
- 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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GE Healthcare Life Science Filter Holder
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