Septa (cap liners)

Part number: J208-0001193150

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Diameter 8 mm
Liner White silicone/red PTFE 1.5 mm thick septa
Description 8 mm white silicone/red PTFE 1.5 mm thick septa PK100

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Septa, caps and liners play a key role in the storage and preparation of samples. They securely seal samples from the external environment while simultaneously allowing injection by sampling needles.

Septa must be chemically compatible with your sample and solvent to ensure they provide an effective seal.

Features and benefits

  • Trajan septa undergo conditioning (thermal and chemical) to reduce siloxane bleed. Siloxane bleed can occur during heating, solvent interaction or piercing by the autosampler needle causing the material to become stressed.
  • Septa liners are often laminated with a layer of high chemical resistance material such as PTFE or FEP. This provides a protective barrier unless punctured, such as with an autosampler syringe needle. Please contact Trajan to discuss specific compatibility requirements.
  • Thicker septa give improved resealability, for methods which involve multiple injections or long running times.

Recommended applications

Septa suitability with chemicals
The table below summarizes the suitability of each septa material with a range of chemicals, this can vary based on factors such as temperature, molecular weight and solvent concentration.

Filter by chemical:

 

PTFE

PTFE/silicone

PTFE/silicone/PTFE

Viton

Silicone

Silicone/FEP

Silicone/polyimide

Butyl

Foam (PTFE/polyethene foam)

Acetonitrile

 

 

Hydrocarbons

 

 

 

Methanol

 

Benzene

 

 

 

THF

 

 

 

 

Toluene

 

 

 

 

DMF

 

DMSO

 

 

 

Ether

 

 

 

DCM

 

 

 

Alcohols (ethanol)

Acetic acid

 

Acetone

 

Phenol

 

 

Cyclohexane

 

 

 

 

Septa compatibility with applications
This table provides a summary of the suitability of our septa materials to a variety of applications.

 

PTFE

PTFE/silicone

PTFE/silicone/PTFE

Viton

Silicone

Silicone/FEP

Silicone/polyimide

Butyl

Natural rubber

Temperature range

Up to 260°C

-40°C to 250°C

-40°C to 250°C

-40°C to 260°C

-40°C to 250°C

-40°C to 250°C

-40°C to 300°C

-50°C to 150°C

0°C to 90°C

Multiple injections

No

Yes

Yes

No

Yes

Yes

Yes

No

No

Price

Very economical

Economical

Most expensive

Economical

Very economical

Economical

Expensive

Economical

Most economical

Suitable for storage

No

Yes

Yes

No

Yes

Yes

Yes

No

Yes

Best for

  • Superior chemical inertness
  • Single injections
  • Short cycle times
  • Most common HPLC and GC analyses
  • Not suitable for chlorosilanes
  • Ultra analysis
  • Repeat injections
  • Internal standards
  • Chlorinated solvents
  • High temperatures
  • Limited resealing, not suitable for multiple injections
  • General purpose
  • Highest chemical compatibility
  • Sample sensitive to PTFE exposure
  • High temperature
  • Organic solvents
  • Acetic acids
  • Impermeable to gases
  • General GC
    applications
  • Limited
    resealability

Product specifications

  • Septa liner and film materials: Silicone, silicone with PTFE, silicone with polyimide, silicone with FEP, butyl, foam, viton.
  • Septa thickness range: 0.25 mm to 4 mm.
  • Septa configurations: Non slit, straight slit, star slit, cross slit, Y-cut, step slit, washer.

More

Please refer to the brochure (includes part number lists) for more items.