A glass sintered (fritted) disc Buchner Filter Funnel equipped with a standard ground joint stem without a Vacuum Hose Barb. These funnels are designed for vacuum filtration where a secure, airtight connection to a filtering flask is required.
Key Features
- Body & Disc: Made from high-quality Borosilicate 3.3 glass, known for its excellent chemical resistance and thermal stability.
- Joint Type: Features a Standard Ground Mouth (conical joint) on the stem for direct fitment into laboratory flasks.
- Design: Heavy-walled construction to safely withstand the pressure differential during vacuum-assisted filtration.
| Porosity Grade | Pore Size (
 |
Common Application |
|---|---|---|
| G1 | 80 – 120 | Coarse filtration; rapid flow |
| G2 | 40 – 80 | Preparative filtration; crystalline precipitates |
| G3 | 15 – 40 | Analytical work; fine precipitates (most common) |
| G4 | 5 – 15 | Very fine precipitates; clarifying liquids |
| G5 | 1 – 2 | Bacterial filtration; ultra-fine particles |
| Capacity (ml) | Standard Joint Size | Approx. Disc Diameter (mm) |
|---|---|---|
| 30 | 14/23 or 19/26 | 30 |
| 50 | 19/26 or 24/29 | 40 |
| 100 | 24/29 or 29/32 | 50 |
| 250 | 24/29 or 29/32 | 60 |
| 500 | 24/29 or 29/32 | 90–95 |
| 1000 | 24/29 or 29/32 | 110–120 |
Usage Limitations
To prevent damage to the sintered glass disc, avoid using these funnels with:
- Hydrofluoric acid (HF).
- Hot concentrated phosphoric acid.
- Hot concentrated alkaline solutions (alkali bases).