Constricted Vacuum Tubes
Constricted NMR tubes offer the most convenient way to flame-seal an air sensitive sample. Simply apply vacuum to the 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 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 |
