Introduction to Septa Materials
Selecting the appropriate septa material is critical for maintaining sample integrity and achieving optimal analytical results in LC-MS applications. This guide covers the key considerations for septa selection.
Common Septa Materials
The most commonly used septa materials include:
- PTFE/Silicone: General purpose, good chemical resistance
- PTFE/Red Rubber: Cost-effective, moderate chemical resistance
- Pre-slit PTFE/Silicone: Reduced coring, easier needle penetration
- Bonded Septa: Adhesive-free sealing, lowest contamination risk
Selection Criteria
When choosing septa for your LC-MS application, consider:
- Sample solvent compatibility
- Temperature requirements
- Number of injections needed
- Sensitivity of your analysis
Recommendations
For most LC-MS applications, we recommend PTFE/Silicone septa with bonded cap technology. This combination provides excellent chemical resistance, minimal extractables, and reliable sealing performance.
