|Intermediate Pressure Valved NMR Sample Tubes
|Norell, Inc. is pleased to announce the introduction of a new NMR sample tube product line, featuring a glass/
PTFE pressure valve permanently joined to your choice of a wide selection of available 5 mm O.D. sample tubes.
These pressure tubes facilitate experiments requiring conditions such as pressurized inert atmosphere
blanketing, addition of reactive gaseous reagents under pressure, containment of low boiling point solvents or
samples at elevated temperatures, and so on.
We recommend that the maximum operating pressure should be limited to 700 kPa (7 bar, 100 psi) when
using a thin wall pressure tube, up to1400 kPa (14 bar, 200 psi) if using a heavy wall pressure tube.
Cautionary Note: Glass can be an unpredictable material, especially if it has been scratched or subjected to rough handling. As such,
EXTREME CAUTION should be exercised when using glass at elevated pressure or temperature, because it has the potential to fail suddenly and
catastrophically. Therefore, anyone attempting to use glass components, such as NMR sample tubes at elevated or reduced pressures and/
or temperatures should ensure that adequate personal protection, such as explosion shields, full face coverage shields, heavy gloves, etc., are
employed to protect oneself against flying glass fragments if a glass component fails explosively.
The valve accepts 1/16 inch O.D. PTFE tubing, a common laboratory instrumentation pressure line. The
required components, a 1/16 inch ferrule and matching compression nut, are included with the valve assembly.
The valve easily and quickly connects and disconnects by means of the single compression nut.
All components of the valved pressure tube consist of either glass or polymer, as described in more detail
below, allowing safe use in high magnetic field environments.
The sample tube portion, manufactured from ASTM Type 1 Class A glass (Pyrex® or an equivalent) is available
in lengths of 7 inch or 8 inch, with thin, medium or heavy wall construction, and field strength ratings of 300,
400, 500 and 600 MHz.
This glass type tolerates a maximum temperature of about 230°C, and resists sudden temperature changes,
or thermal shock, very well without breakage, but sudden temperature changes should be restricted to a range of
120°C or less.
The pressure valve portion possesses superior chemical and corrosion resistance. The glass shell, also formed
from ASTM Type 1 Class A glass, matches that of the sample tube, thereby minimizing breakage of the joint
caused by internal strain or thermal shock.
The valve stem, composed of PTFE fluoropolymer (polytetrafluoroethylene) is completely inert and resists
virtually all solvents, reactive chemicals and reagents, and deterioration induced by corrosive conditions.The ferrule, or sealing nut (included with the valve), used to seal the pressure supply tubing to the valve,
also displays excellent corrosion and chemical resistance. Constructed from ETFE (ethylene-tetrafluoroethylene)
fluoropolymer, this material combines excellent mechanical properties, such as toughness, high impact strength,
long flex life, medium stiffness and good abrasion resistance with nearly the same level of chemical resistance
shown by the fully fluorinated polymers such as PTFE.
The compression nut (also included with the valve) is machined from PEEK (polyether ether ketone). This
material is an advanced, high-performance polymer having excellent mechanical properties, ensuring long life
and reliable performance throughout numerous connecting and disconnecting operations. It is a very hard
material, with a very high degree of tensile strength, stiffness and dimensional stability, along with excellent
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