Pressure limits of NMR tubes

A customer recently asked if a glass NMR tube could hold 5 bar of pressure, and that he wanted to do a catalytic reaction under pressure during data acquisition. A standard NMR tube with a 0.38 mm wall and 5mm OD has a limit of about 10.3 bar, from P_max = tube wall thickness ÷ tube wall O.D. X 135 bar.

It is suggested that when using an NMR tube for higher pressure experiments within the recommended pressure rating, that you check for any damage to the surface of the glass tube before pressurizing, since this could lead to tube failure.