Tag Archives: Gas-Tight

Gas-Tight Consumables for Liquid-Phase and Gas-Phase NMR

1. NMR Sample Tube選用對照表
2. Standard Consumables for Liquid-Phase NMR
3. Consumables for Liquid-Phase small Volume and External Reference NMR Studies
4. Gas-Tight Consumables for Liquid-Phase and Gas-Phase NMR
5. NMR Reference Solutions  
6. Accessories for Liquid-Phase NMR  
7. Consumables and Accessories for Solid-State NMR  

Gas-Tight Consumables for Liquid-Phase and Gas-Phase NMR
Constricted Vacuum Tube and Tip-Off Manifold
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, and then heat the constricted portion and twist off to seal the sample in tube. 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.

Tip-Off Manifolds
Chemical resistance of the manifold ports is excellent. The NMR tube will connect to a threaded aluminum bushing which is isolated from the vacuum by a Teflon high vacuum rotary valve with Viton O-rings. Rotating the valve will open and close the tube to the vacuum line.

Low Pressure/Vacuum Tube

Wilmad introduces a novel low pressure/vacuum (LPV) tube for both NMR and EPR experiments. A redesigned sealing surface eliminates leaks and greatly increases its lifetime when compared to traditional gastight tubes. Our low pressure/vacuum tube continues to offer a convenient flame-free sealing solution for air sensitive or volatile liquid samples at any pressure from vacuum to pressure slightly above 1 bar.

• 4X larger sealing surface increases lifetime and reliability.
• PTFE piston provides a 100% contamination-free seal.
• Axial symmetric design guarantees its application in spinning experiments.
• Spare glass tube can be purchased separately.
• Cheaper price reduces experimental costs.
• Standard sizes can be shipped within 1-2 business days after receipt of order.

 J. Young NMR Tubes
Wilmad continues to carry the J. Young Tube for your convenience. For better performance, please check our Low Pressure/Vacuum Tube on the previous page.

Simply attach the glass GVA-X adapter to a vacuum source, open the VNMR/X-PISTON valve by turning counterclockwise and evacuate your sample.
Close valve and place into your NMR spectrometer. Tubes can be kept under vacuum or moderate pressure for a considerable length of time. The system is straightforward and easy to use.


Screw-Cap NMR Tubes
The Screw Cap Tube is commonly used in sample degasification. The vacuum quality that it can maintain is >10-4 torr. For better vacuum, please check our Pressure/Vacuum Tube and Quick Pressure Valve Tube .
Each Screw-Cap Tube comes with one PTFE/Silicone septum.

Note 1: PTFE/Rubber Septum is a laminated disc consisting of a sheath of PTFE, which is bonded chemically to white pharmaceutical rubber. This septum is inert to most solvents and many corrosive materials but not recommended for multiple punctures.
Note 2: PTFE/Silicone Septum is a laminated disc consisting of a sheath of PTFE, which is bonded chemically to silicone rubber. This type of septum is inert to most organic solvents and compounds but poor to strongly corrosive materials. Remains reliable after multiple punctures.

 Quick Pressure Valve (QPV) NMR Sample Tubes

Wilmad’s Quick Pressure Valve Sample Tubes are specially
designed to simplify the work of NMR studies for catalysis, gas-liquid phase reactions, air sensitive samples and elevated temperature studies using low boiling point solvents.

• Easy to operate – one turn to open, one to close.
• Larger opening for convenient sample addition.
• Lightweight, concentric design for better performance.
• Offered with Wilmad Precision Tubes – thin, medium and heavy wall.
• Choice of Viton® or Kalrez® O-ring for different applications.
• Adapters available to both 1/16” and 1/8” tubing.

 Pressure/Vacuum NMR Tubes
Wilmad’s Pressure/Vacuum Tube is the most reliable NMR tube for medium range pressure (<300 psi) experiments in the market. It is designed to be connected to a 1/8” metal (stainless steel or brass) vacuum line using SwageLok® fittings or a rubber vacuum hose using a glass connector (OF-60). The PV-ANV valve is made of Teflon® and all other parts are made of Pyrex® or equivalent glass. Valve is opened simply by turning counterclockwise.

Omni-Fit NMR Tubes
Omni-Fit valve NMR tubes are designed for easy injection of chemicals through a gas-tight syringe for air sensitive samples without using a glove box. The Omni-Fit Tube consists of a 507-PP tube topped by a sturdy 2″ section of medium-walled tubing which supports the valve system.

Due to the nature of glass, Extreme Caution should be exercised when using at elevated or reduced pressures as performance of tubes under pressure or vacuum cannot be guaranteed. Adequate safety shielding should always be used when working in these conditions.