Whatman cellulose filter paper grades are now available in a flat, quadrant folded format to fit conical filter funnels.
| Nominal thickness (µm) | Nominal basis weight (g/m²) | Nominal ash content (%)¹ |
| 210 | 95 | 0.007 |
| Diameter (mm) | Catalog number | Quantity/pack |
| 110 | 10380004 | 500 |
| 125 | 10380005 | 500 |
| 150 | 10380006 | 500 |
