Description
Semi-permeable paper barrier placed perpendicular to a liquid or air flow. Used to separate fine solids from liquids or air.
Brand: Whatman
Description: Whatman Filter Paper, Qualitative, Medium Speed, Grade 1, 20mm Dia, 11um Pore Size, Biodegradable, 400/Pack
Size: No.1
Unit: 100 Pieces/Box
UOM: PK
General Description:
| Whatman No. | Double Ring | Particle Retention in Micron | Speed |
| 1 | 102 | 8-10 | Medium |
| 40 | 202 | 8-10 | Medium |
| 41 | 201 | 18-20 | Fast |
| 42 | 203 | 2-5 | Slow |