Constricted Vacuum Tubes & Tip-Off Manifolds
Constricted Vacuum Tubes
Constricted NMR tubes offer the most convenient way to flame-seal an air sensitive sample. Simply apply vacuum to the Vacuum Tube using our Tip-Off Manifold, then heat the constricted portion and twist off to seal the sample. Order a constricted NMR tube by adding “CONS” to the product number of any Wilmad sample tube. Example: 507-PP-7CONS.
Unless otherwise specified, constrictions are placed 1 inch from top of the Vacuum Tube. Order tubes that are 1 inch longer than your required finished length.
Constricted Vacuum Tubes
| Tube I.D. | Constricted I.D. |
|---|---|
| 3-5mm | 1mm |
| 6.5-16mm | 2mm |
| 18-30mm | 2mm |
Tip-Off Manifolds
The Tip-Off Manifold connects to an NMR tube by a threaded aluminum bushing which is isolated from the vacuum by a PTFE high-vacuum rotary valve with Viton O-rings. Rotating the valve will open and close the tube to the vacuum line.
- Highly resistant to chemicals
- Easy operation
Tip-Off Manifolds and Replacement Parts
| Catalog No. | Fits tube with O.D. | Description |
|---|---|---|
| 552-3 | 3mm | Complete Tip-Off Manifold |
| 552-3-B | 3mm | Aluminum Port Bushing |
| 552-3-O | 3mm | Viton O-Ring |
| 552-4 | 4mm | Complete Tip-Off Manifold |
| 552-4-B | 4mm | Aluminum Port Bushing |
| 552-4-O | 4mm | Viton O-Ring |
| 552-5 | 5mm | Complete Tip-Off Manifold |
| 552-5-B | 5mm | Aluminum Port Bushing |
| 552-5-O | 5mm | Viton O-Ring |
| 552-10 | 10mm | Complete Tip-Off Manifold |
| 552-10-B | 10mm | Aluminum Port Bushing |
| 552-10-O | 10mm | Viton O-Ring |
| 552-P | — | Replacement Piston Valve |
| 552-S | — | Replacement Piston O-Ring |
| 552-G | — | Replacement Glass Valve Section |
Can’t find something? Email us at sales@gossinst.co.uk or message our team via the contact page. We are always happy to answer any questions you may have regarding Vacuum Tubes or other Wilmad Labglass products and will be delighted to assist you in locating precisely what you need.