Contact your safety officer or director prior to performing an experiments at elevated pressure to assure that all precautions prescribed by your organization are followed. Wilmad can't take responsibility for the results of failure of its glass sample devices at elevated pressure. Valve NMR Tube can be used at small to moderate pressures, Wilmad offers a tube with a more substantial closure in its Pressure Valve NMR Tube. The valve can be closed by hand or using a small wrench. Samples must be limited to those which can pass through the 0.8mm orifice of the valve assembly.
Axial symmetry is achieved through the design and preparation of the valve assembly.
Although annealed, extreme caution should be applied when using PV NMR tubes, as noted above. Order the shortest tube possible to reduce the overall weight of the tube, which is substantial with the valve attached. Sample spinning or ejection can be difficult if your sample is too heavy. Alternate materials have been used in obtaining spectra at high pressures, including Sapphire 1 and Stainless Steel 2 . These materials should be considered when higher pressures are contemplated.