Depending on your application requirements, you can choose between our Standard Series^TM or Select Series^TM NMR Tubes. Both types are manufactured using state-of-the-art technology to maintain total quality in meeting stringent concentricity and camber specifications. Below you will find a brief description of the two types of glass materials commonly used in making NMR tubes, and important physical characteristics to consider when choosing a sample tube for an experiment.

Our Select Series^TM NMR tubes are manufactured out of ASTM Type 1 Class A glass, commonly referred to as Pyrex® 7740 (Corning), Duran® (Schott Glass), or Kimax® (Kimble) KG-33 glass. Several key properties that make this glass type desirable for NMR are its high degree of thermal shock resistance and low expansion coefficient. This allows for a greater margin of safety from breakage when used in variable temperature applications and freeze/thaw cycling, or under any other application where large temperature variations are required in the experiment.

Our Standard Series^TM NMR tubes are manufactured out of ASTM Type 1 Class B glass, commonly referred to as type N-51A. Applications that are suited for using this type of glass are for routine NMR use where samples are run under room temperatures with no thermal gradients. Notice that the thermal shock resistance differs by 75ºC, and its expansion coefficient differs by 13 E-7 compared to the glass used in our Select Series^TM tube line. It is therefore not recommendable to fuse this glass with standard vacuum manifolds and the like, since these are generally made out of Type 1 Class A glass.