| material | circles |
| cotton filters (high-quality cotton linters) | |
| packaging | pack of 100 |
| mfr. no. | Whatman Article No., 28418249 (US reference) |
| Whatman, 1542-090 | |
| limit | 2510 sec/100 mL speed (Herzberg) |
| 6 psi wet burst | |
| diam. | 90 mm |
| thickness | 150 μm |
| ash | ≤0.006% |
| pore size | 2.7 μm (Particle retention) |
| basis weight | 93 g/m2 |
