- Most widely used general purpose laboratory filter paper
- Medium retention, 11 µm, medium - fast flow rate, smooth surface
Clarifies liquids in routine laboratory applications and for air pollution monitoring. Used in air monitors to collect atmospheric dust for assessment of stain intensity. Also available in 46 x 57 cm sheets.
| Grade | Weight g/m2 | Thickness | ASH % | Surface Texture | LIQUID Retention |
| 1 | 87 | 0.18 mm | 0.06 | Smooth | 11 µm |
| 2 | 97 | 0.19 mm | 0.06 | Smooth | 8 µm |
| 3 | 185 | 0.40 mm | 0.06 | Rough | 5 µm |
| 4 | 92 | 0.21 mm | 0.06 | Smooth, open | 20-25 µm |
| 5 | 100 | 0.20 mm | 0.06 | Smooth | 2.5 µm |