Leakage or damage to the gas chromatograph injection pad:

The design of the gas chromatograph septum ensures constant sealing of the system after the injection needle has been pierced, during the injection, and after withdrawal. Therefore, rubber or plasticized materials that can withstand certain temperatures and pressures are required to maintain this excellent sealing property.

2) However, this type of pad will age and even leak over time with a certain number of injections, failing to meet the sealing requirements for gas chromatography injector samples.

3) In some cases, when the gas chromatography injector pad becomes aged and damaged, its sealing performance degrades, leading to the inability of the carrier gas column to reach the set pressure requirements, causing a series of issues. Some more advanced instruments may even shut down automatically.

4) Leaks in the gas chromatography injector pad can lead to a series of issues, including poor quantitative repeatability and changes in the retention time of the analyzed samples (increase). Therefore, the injector pad should be checked and replaced regularly. Some gas chromatography operators opt to replace a new injector pad before each new sample analysis.