Selection Instruction for Septa of Sample Vial
For the sample vials, they are usually equipped with the matched septa during the production process. To maintain the higher and better performance of the sample vial, it is quite essential to choose the most suitable septa of sample vial used for the experiments based on the compatibility of the material.
The PTFE septa is highly resistant to corrosive solvents. Although its thin film could be subjected to the penetration of most needles, the PTFE septum is not resealable. Thus, it must be used in sampling analyses with short injection intervals or single injection.
PTFE/silicone synthetic septa, on the contrary, is available for all types of chromatography applications, especially for most HPLC and GC applications. It can withstand multiple punctures with repeat sealing performance and high purity and inertness. It could be used with the sampling devices of Agilent 1050, 1090, 1100 or other autosamplers with large diameter blunt needles.
The PE septa are chemically resistant, whose surface penetration thickness is 0.01 millimeter. It is only suitable for single injection and ideal for fine gauge needles.
Just like the PE septa, the PP septa also have high chemical-resistance to most solutions. It is also appropriate for a one-time sampling injection.