Septa (cap liners)

Part number: J208-0001193150

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Collections: Automation consumables, Sampling, Septa, Septa, caps and liners

Category: Automation consumables, Autosampler, GC, GCMS, HPLC, LCMS, Sampling, Septa, Septa/liners, Vial accessories, Vial cap liners

Type: Septa liners

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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.

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

Brochure - Septa, caps and liners [PDF]