Cap and septa assemblies
Image is representative (may not be specific item).
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
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Crimp caps |
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Screw caps |
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Snap caps |
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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 |
|
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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.
More
Please refer to the brochure (includes part number lists) for more items.