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Thumbnail Filmstrip of Grade 4 Qualitative Filter Paper, Standard, 70mm Circle, 100/Pk Images
Whatman Grade 4 Qualitative Filter Papers are a standard grade, high flow rate filter paper. They are useful in qualitative analytical separations when fast flow is required and the collection of fine particles is not critical.
These cellulose filters are used in qualitative analytical techniques to determine and identify materials (e.g., in air pollution monitoring).
Extremely High Flow Rate
Excellent retention: captures coarse particles and gelatinous precipitates such as ferric hydroxide and aluminum hydroxide
Fast filtration: useful for routine clean-up of biological fluids or organic extracts during analysis
| Whatman Product Code | 1004-070 |
| Material | Cellulose |
| Grade | Grade 4 |
| Size | 70mm |
| Typical Particle Retention Rate in Liquid | 25 um |
| Thickness | 210 μm |
| Ash Content | ≤0.06% |
| Basis Weight | 92 g/m^2 |
| Air Flow Rate | 4 s/100ml/in^2 |
| Water Flow Rate | 247 ml/min |
| Format | Circles |
| Pack Size | 100 |
- Diameter
- 70mm
- Grade
- 4
- Material
- Cellulose
- Pack Count
- 100
- Pore Size (µm)
- 20.0-25.0
- Sterility
- Nonsterile
- Wetability
- Hydrophilic