Considerations
- Instrument
- Size
- Material - Low bleed, soft, long lasting
Septa types
| CRS GP (General purpose) GC septa (GP grade) | CRS Puresep T GC septa | CRS AG3 (Advanced Green 3) GC septa (EC grade) | CRS Marathon GC septa (MN grade) | CRS BTO® GC septa (HT grade) | Enduro Blue GC septa | |
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| Low temperature applications | Enhanced durability and low bleed for low temperature applications. | Combines significantly longer injection life, low bleed and low injection port adhesion. | Premium septum for autosamplers. Up to 400 injections per septum. | Bleed and temperature optimized, combined with outstanding mechanical properties for the highest temperature applications. Retains softness and pierceability at high temperatures, and low injection port adhesion. | For Shimadzu GCs | |
| Material | Silicone | Silicone/PTFE | High temperature silicone | High temperature silicone | BTO silicone | High temperature silicone |
| Durability | Good | Good | Excellent | Excellent | Excellent | Excellent |
| Resealing | Good | Good | Excellent | Excellent | Excellent | Excellent |
| Solvent resistance | Excellent | Good | Excellent | Excellent | Excellent | Excellent |
| Tear resistance | Good | Good | Excellent | Excellent | Excellent | Excellent |
| Maximum temperature | 275°C | 225°C | 350°C, 300°C for 17 mm size | 350°C, 300°C for 17 mm size | 400°C, 330°C for 17 mm size | 350°C |
CRS Endura-Seal GC septa
CRS Endura-Seal GC septa are resilient to needle wear and tear, eliminates coring and are recommended for automated analysis that requires long run times. Endura-Seals are a patented alternative to typical silicone-rubber injection port septa for gas chromatography. They work in a 2-part sealing system that includes the septa and the sealing nut. Endura-Seals offer excellent durability and good resealing, for use at maximum injector temperature of 400°C.