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Bottle Septa

The applied septum is crucial for optimal analysis. Primarily, the septum should be inert to the sample solution and at the same time protect it from outside contamination as well as from possible evaporation. Almost all sealing discs are coated on one side with PTFE (Polytetrafluoroethylene), which has a high chemical resistance and forms an inert barrier between the sample and the carrier material of the septum. The carrier materials have different physical and chemical properties, e.g. temperature resistance, reclosing properties, purity, hardness, thickness, etc. We offer bottle septa with a diameter of 8mm to 22mm. Select the needed size in the drop down menu on the left. Choose from septa by PerkinElmer and our home brand Altmann Analytik. These septa are a low cost and high quality alternative.

For more Information about bottle septa, please click here.

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Bottle Septa

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  1. Altmann Analytik

    Septa, ND13, 12 mm diameter, PTFE, 0,25 mm 1000/pck

    SKU: AAV23131279
  2. Altmann Analytik

    Septa, 16 mm diameter, 1,3mm 1000/pck

    SKU: AAV27131764
  3. Altmann Analytik

    septa, ND20, 3,0mm, Si blue transp./PTFE white, 1000/PAK

    SKU: AAV31131252
  4. Altmann Analytik

    Septa, 22 mm diameter, 3,2 mm, EPA-quality, 1000/pck

    SKU: AAV33132219
  5. PerkinElmer

    Headspace Crimp Caps, 20 mm diameter, PTFE/Silicone Septa, 1000/PAK

    Regular Price: €1,090.00

    Special Price €926.50

    SKU: PEB4000022
  6. Supelco


    SKU: SU27144
  7. Altmann Analytik

    septa, 22 mm diameter, 1,3mm 1000/PAK

    SKU: AAV33131653
  8. Altmann Analytik

    Septa, 22 mm diameter, PTFE, 0,25mm 1000/pck

    SKU: AAV33132212
  9. Agilent Technologies

    septa, PTFE/natural rubber, for 4 mL vials, 144 pcs.

    SKU: AG9301-1031
  10. Agilent Technologies

    septa for screw top caps, certified, PTFE/white silicone/red PTFE

    SKU: AG5182-0729
  11. Altmann Analytik

    Septa, 8 mm diameter, Viton 1A schw., 1,5 mm 1000/pck

    SKU: AAV19131331
  12. Altmann Analytik

    Septa, 8 mm diameter, Viton 1A black, 1,0 mm, 1000/pck

    SKU: AAV19131885
  13. Altmann Analytik

    Septa for short thread screw cap, ND9, PTFE, 1000/pck

    SKU: AAV20132091
  14. Altmann Analytik

    Septa, 10 mm diameter, PTFE virginal, 0,25mm 1000/pck

    SKU: AAV21131757
  15. Altmann Analytik

    Septa, 11 mm diameter, Viton 1A black, 1,5 mm 1000/pck

    SKU: AAV22131332
  16. Altmann Analytik

    Septa, 17 mm diameter, butyl red/PTFE grey, 1,6 mm, 1000/pck

    SKU: AAV28132526
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Properties and applications of septa made of TEF, PTFE, butyl, silicone etc.

Naturkautschuk /TEF
  Application: HPLC/GC

• Standard quality for HPLC
• Good reclosure properties for multiple injections
• Relatively inexpensive
• Temperature resistant from -40 ° C to 120 ° C
• Not very clean as a natural product
• Punching discs (punched from sheet / roll material

RedRubber / PTFE (synthetic rubber)
  Application: HPLC/GC

• NEW standard quality for HPLC and GC
• Synthetic rubber, cleaner and softer than natural rubber
• Relatively inexpensive
• Temperature resistant from -40 ° C to 110 ° C
• Punching discs (punched from sheet / roll material)

Butyl (septa / stopper)
  Application: Headspace

• In the absence of a PTFE coating, only for uncritical analyzes
• Butyl as a synthetic rubber cleaner than natural rubber
• Very cheap as there is no PTFE coating
• Application examples: breweries, blood alcohol analyzes
• Original Butyl stopper for PerkinElmer
• Forming discs (vulcanized and formed in a mold)

Pharma-Fix Septum Butyl / PTFE
  Application: GC/HPLC/Headspace

• Specialty: Pharma-Fix washer only centric PTFE-coated butyl disc; The elastic butyl lying on the glass edge achieves a significantly better seal than the slippery surface of a completely laminated sealing disc
• Butyl as a synthetic rubber cleaner than natural rubber
• Relatively inexpensive compared to silicone
• Temperature resistant from -40 ° C to 120 ° C
• Synthetic rubber has poorer reclosure properties than natural rubber
• Forming discs (vulcanized and formed in a mold)

(PTFE /) silicone / PTFE
  Application: GC/HPLC/Headspace

• Silicone is the purest synthetic elastomer and is therefore used for critical analyzes
• Temperature resistant from -60 ° C to 200 ° C
• Improved reclosure properties than NK / TEF as a synthetic elastomer
• (segmented) septa in HPLC as penetration aids for thick / blunt needles and for producing a valve effect in the case of multiple injections
• Specialty: PTFE-coated silicone washers on both sides for low particle formation
• punching discs (punched from sheet / roll material)

Silicon / aluminum foil
  Application: Headspace

• All chemical and physical properties, such as silicone / PTFE
• However, slightly higher temperature resistance from -60 ° C to 220 ° C
• Frequently on PerkinElmer devices
• More expensive than PTFE-coated septa

Pure PTFE septa
  Application: HPLC

• Very inert, therefore also as a coating on most other sealing discs
• No elastomer
-> No sealing
-> No reclosing properties
• Do not press-fit into caps; Are therefore often only sold unassembled
• Very cheap
• Only for very uncritical applications
• Are often used on VWR (Merck) / Hitachi and Waters instruments

Durometer (hardness of the septum)

Durometer is the hardness of a septum, expressed in ° shore. The higher the "shore" number, the harder the septum, the lower the "shore" number, the softer the septum. The softest sealing disc is 45 ° shore A and the hardest 70 ° shore A is hard. In addition to the thickness of the disc, the hardness is an important indicator, which septum is suitable for the penetration of a certain needles (sensitive needles, thin or thick needles, pointed or blunt needles, etc.).

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