NORELL™, TUBES, NMR, 5MM, SELECT SERIES™, CONSTRICTED, WITH CAPS

NORELL™ Select Series™ Constricted NMR Tubes offer a convenient way to seal your sample from air or other contaminants. Simply heat the constricted portion using a suitable source, and gently twist and pull on the open end to seal. Also allows samples to be stored under vacuum or inert gas. These tubes are manufactured out of ASTM Type 1 Class A glass, commonly referred to as Pyrex® 7740 (Corning), Duran®, 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 any other application where large temperature variations are required in the experiment.