Our new NMR septum caps for standard 5 mm NMR tubes are made of EVA and have a special sealing septum inside the cap.
This septum ensures significantly better sealing than standard NMR caps, for example with regard to chloroform or other solvents.
A special evaporation test conducted by Bruker Biospin confirmed the extraordinary tightness of the caps. The caps can be punctured with conventional needles, and are also suitable for automated applications.