SP Scienceware Wilmad Disposable NMR Tube Caps, 4.0mm Dia, Blue, Different colors help track samples based on various reference solvents, Pack of 100

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Alert: When using Chloroform or Acetone as a reference solution, please avoid direct contact between the sample and the disposable cap, and avoid long term storage over 2 hours. If these conditions cannot be avoided, please use PTFE tube caps.