- For use without filter paper
- Offered in nine sizes and three porosities
- Pore sizes 40 to 60 µm = C, 10 to 15 µm = M and 4 to 6 µm = F
- With square-cut, fire-polished rim
These funnels are especially useful where filter paper would be attacked by the material being filtered. The disc should not be subjected to pressure differential in excess of 1 atmosphere. The top edge is beaded.