Product Description
Adding liquid to a closed or inert-atmosphere reaction is smoother when the funnel does not fight back pressure. These cylindrical addition funnels include a pressure-equalizing line, so reagents flow evenly without opening the system or creating a vacuum lock during long additions.
This listing is for Kimble catalog number 634000-0250: KONTES Ungraduated Addition Funnel, Glass Stopcock, 250 mL. Funnels are made from 33 expansion low-extractable borosilicate glass meeting USP Type I and ASTM E438 Type I, Class A. The 634000 series uses a glass stopcock, while the 634030 and 634040 series use a PTFE stopcock. Joints are 24/40 or 29/42 depending on model, and capacities range from 60 mL to 1000 mL. LIGHT LABS supplies the complete DWK Life Sciences line, including Kimble, Wheaton and DURAN labware.
Key Features
- Pressure-equalizing line – Keeps flow steady in closed systems.
- Glass or PTFE stopcock – Choose a classic glass plug or grease-free PTFE.
- Cylindrical body – Compact shape fits multi-neck setups.
- Standard taper joints – 24/40 or 29/42 connections.
- Wide capacity range – 60 mL to 1000 mL.
Specifications
| Catalog Number | 634000-0250 |
| Brand | Kimble (DWK Life Sciences) |
| Description | KONTES Ungraduated Addition Funnel, Glass Stopcock, 250 mL |
| Sold As | Each |
| Material | Borosilicate glass 3.3, low extractable |
| Glass standards | USP Type I; ASTM E438 Type I, Class A |
| Stopcock | Glass or PTFE |
| Stopcock bore | 2 mm; 4 mm |
| Joint | 24/40; 29/42 |
Available Options
- 634000-0060 – KONTES Ungraduated Addition Funnel, Glass Stopcock, 60 mL
- 634000-0125 – KONTES Ungraduated Addition Funnel, Glass Stopcock, 125 mL
- 634000-0500 – KONTES Ungraduated Addition Funnel, Glass Stopcock, 500 mL
- 634030-0060 – KONTES Ungraduated Addition Funnel, PTFE Stopcock, 60 mL, Height: 295mm
- 634030-0125 – KONTES Ungraduated Addition Funnel, PTFE Stopcock, 125 mL
- 634030-1000 – KONTES Ungraduated Addition Funnel, PTFE Stopcock, 1000 mL
- 634040-0060 – KONTES Ungraduated Addition Funnel, PTFE Stopcock, 60 mL, Height: 300mm
Applications
- Inert-atmosphere synthesis
- Dropwise reagent addition
- Grignard and organometallic reactions
- Reflux setups
