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As an essential element of any GC system, we carry a wide selection of high quality septa for your laboratory applications. We offer Septa by Agilent Technologies, Thermo Fisher, SGE and other leading manufacturers. High-quality and affordable alternatives are available in the form of our own brand Altmann Analytik. Click here for GC Ferrules.

Questions about our products? Our expert team will advise you on all questions.

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GC Septa

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  1. Agilent Technologies

    Non-Stick BTO septa, 11mm, 50 pcs.

    €91.00
    SKU: AG5183-4757
    In Stock
  2. Agilent Technologies

    Septa for screw top caps, certified, PTFE/red silicone, 9mm, 100 pcs.

    €16.00
    SKU: AG5182-0731
    In Stock
  3. Agilent Technologies

    Non-Stick BTO Inlet septa 11 mm diameter, 100 pk

    €167.00
    SKU: AG5183-4757-100
    In Stock
  4. Agilent Technologies

    graues septa, PTFE/schw. Butyl, 20 mm diameter, 100St

    €74.00
    SKU: AG9301-0976
  5. SGE

    HT septa, 6 mm, 50 pc/pak

    €85.00
    SKU: SG0418999
    In Stock
  6. SGE

    GP septa, 5 mm, 50 pc/pak

    €43.00
    SKU: SG041820
  7. SGE

    GP septa, 11 mm, 50 pc/pak

    €50.00
    SKU: SG041826
  8. SGE

    GP septa, 11,5 mm, 50 pc/pak

    €50.00
    SKU: SG041827
  9. SGE

    MN septa, 11 mm, 50 pc/pak

    €84.00
    SKU: SG041856
  10. Supelco

    THERMOGreen LB-2 for SHIMADZU PK/50

    €127.00
    SKU: SU20633
  11. Supelco

    Septum Thermogreen LB-2, 9 mm diameter, PK50

    €140.00
    SKU: SU28021-U
  12. SGE

    MN septa, 12,5 mm, 48 pc/pak

    €84.00
    SKU: SG0418503
  13. SGE

    HT septa, 12,5 mm, 24 pc/pak

    €50.00
    SKU: SG0418992
  14. Waters

    SEPTA PTFE/SILICONE 100PK

    €24.08
    SKU: WTWAT058874
  15. Waters

    SEPTA/PTFE/SILICONE 8MMPRE 100PK

    €28.46
    SKU: WTWAT058876
  16. Agilent Technologies

    Non-Stick Adv.Green Septen 11 mm diameter, 50Stck

    €84.00
    SKU: AG5183-4759
  17. Agilent Technologies

    septa, PTFE/Sil. w., 8,7 mm diameter, 100Stck. pcs..

    €21.00
    SKU: AG5182-0730
  18. Agilent Technologies

    CrossLab BTO inlet septa 9 mm diameter, 100pk

    €151.00
    SKU: AG8010-0218
  19. Agilent Technologies

    CrossLab BTO inlet septa 11 mm diameter, 50pk

    €85.00
    SKU: AG8010-0223
  20. Thermo Fisher Scientific

    Septum BTO INJ SSL 17 pk10

    €20.65
    SKU: TF31303210
  21. SGE

    GP septa, 6 mm, 50 pc/pak

    €43.00
    SKU: SG041821
  22. SGE

    GP septa, 7 mm, 50 pc/pak

    €43.00
    SKU: SG041822
  23. SGE

    GP septa, 8 mm, 50 pc/pak

    €43.00
    SKU: SG041823
  24. SGE

    GP septa, 9 mm, 50 pc/pak

    €43.00
    SKU: SG041824
  25. SGE

    GP septa, 10 mm, 50 pc/pak

    €43.00
    SKU: SG041825
  26. SGE

    GP septa, 12,5 mm, 48 pc/pak

    €50.00
    SKU: SG041828
  27. SGE

    GP septa, 15 mm, 48 pc/pak

    €64.00
    SKU: SG041829
  28. SGE

    EC septa, 6 mm, 50 pc/pak

    €51.00
    SKU: SG041841
  29. SGE

    EC septa, 7 mm, 50 pc/pak

    €51.00
    SKU: SG041842
  30. SGE

    EC septa, 8 mm, 50 pc/pak

    €51.00
    SKU: SG041843
  31. SGE

    EC septa, 10 mm, 50 pc/pak

    €51.00
    SKU: SG041845
  32. SGE

    MN septa, 5 mm, 50 pc/pak

    €84.00
    SKU: SG041850
  33. SGE

    MN septa, 9 mm, 50 pc/pak

    €84.00
    SKU: SG041854
  34. SGE

    HT septa, 9,5 mm, 100 pc/pak

    €164.00
    SKU: SG041881
  35. SGE

    HT septa, 11 mm, 100 pc/pak

    €164.00
    SKU: SG041883
  36. SGE

    HT septa, Shimadzu, plug, 50 pc/pak

    €133.00
    SKU: SG041895
  37. SGE

    HT septa, 9 mm, 25 pc/pak

    €50.00
    SKU: SG041896
  38. SGE

    HT septa, 9,5 mm, 25 pc/pak

    €50.00
    SKU: SG041897
  39. SGE

    HT septa, 11 mm, 25 pc/pak

    €50.00
    SKU: SG041898
  40. SGE

    HT septa, 11,5 mm, 25 pc/pak

    €50.00
    SKU: SG041899
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Choosing the right GC septum

Septa must withstand high chemical and mechanical loads during everyday use in analytics. Especially the application in combination with GC systems requires a high thermal load capacity of the material. A selection of the most common GC septa can be found below.

Material Max. operating temperature Features
BTO 400 °C (300 °C for 17 mm septa)

Low bleeding

Optimized for GC/MS systems

TR-Green 350 °C Long lifetime
Marathon 350 °C

High mechanical resistance

Up to 400 injections per septa lifetime

TR-Blue 200 – 250 °C

Easy to penetrate

Suitable for routine applications

Inlet septa

The Inlet septa is an essential part of the sample introduction into a GC system. The purpose of the septa is to create a barrier which is penetrated readily from the nozzle needle and is maintained while the internal pressure is held up without contaminating the analysis.

Septa are available in a number of different materials and sizes (according to the specifications of the system). They are generally made from compositions made of silicone rubber with low bleed and high temperature limit. Therefore Septa are recommended in high/upper temperature limits. Materials for lower temperatures are generally softer, seal better and resist a greater number of injections as higher temperature material. If septa are used above the recommended temperature limit, it may leak into the inlet or decompose. This can lead to sample loss since the hermetic seal is lost, that results in lower column flow and a reduction in the life of the column.

Regular exchange of septa

To avoid greater damage and contamination in the entire GC system, the septa should be changed regularly. Thus leaks can be prevented or sample loss reduced in the system. By replacing the septa at reasonable intervals of decomposition of the septa in the system aperture can be counteracted and thus extend the life of the column.

If you can't find a suitable product for your applications, do not hesitate to contact us. Our expert team will advise you independently.