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