Cap and septa assemblies

Part number: J208-1201193100

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

Category: Automation consumables, Autosampler, Cap and liner assemblies, Caps, Caps and liners, GC, GCMS, HPLC, LCMS, Sampling, Septa/liners, Vial accessories, Vial cap liners

Type: Cap and septa assemblies

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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.

Features and benefits

Pre-assembled caps and septa reduce handling and therefore contamination.
Custom color combinations, materials, and geometries available upon request.
Aluminum crimp caps provide a leak-resistant seal.
Use of a crimping tool is required for aluminum seals.
Magnetic crimp seals for use with autosamplers.
Snap caps are easy to apply and remove without tools, eliminating the need for crimping tools.

Recommended applications

Cap types

Crimp caps	Crimp caps provide extra security for studies where it is important to avoid contamination or sample tampering. Can become rounded when crimped onto a vial, resulting in less surface area for magnets to stick to during automation. Require crimper/decrimper, can cause septa distortion if overcrimped.
Screw caps	Often used for LC and LC/MS. Provide an airtight seal. For automation, magnetic screw caps are advantageous because they are less likely to become rounded over time, providing increased surface area for the magnets used to move the vials. This decreases the risk of any vials falling from the magnet.
Snap caps	Simple snap design when crimping tool is not available. Easy removal without special tools.

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

Cap types: Crimp, screw, snap, cap.
Cap materials: Polypropylene, aluminum, tin/steel/nickel coated, bimetal, phenolic.
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]

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