Septa
Septa for Autosampler Vial Caps from Agilent Technologies
Make sure the septa you choose are chemically compatible with your sample and solvent. Chemical compatibility can vary, based on factors such as solvent concentration, molecular weight, and temperature.
Agilent offer a variety of septa to suit every application including certified septa for full warranted compatibility with Agilent autosamplers.
- Buy
- Features
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- Agilent septa are continually being improved to limit leaching, coring, sticking, push-through, hardness, and adsorption/absorption
- During manufacture, Agilent septa undergo thermal and chemical conditioning to reduce siloxane bleed, which can occur when the septa material is stressed during heating, solvent interaction, or piercing by the autosampler needle
- For highly sensitive samples, we recommend PTFE-lined (“sandwiched”) septa, because the PTFE layers act as a chemically resistant barrier
- Specifications
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The chart below summarises chemical compatibility and incompatibility. This is provided as a guide and a starting point. We realise that chemical compatibility can vary depending on the concentration of the solvent, the temperature, the molecular weight of the solvent, and other factors. Therefore it is always recommended you try a variety of septa to determine the best one for your analysis.
PTFE PTFE/Silicone PTFE/Silicone/PTFE* PTFE/Red Rubber Viton PTFE/Butyl Acetonitrile ✔ ✔ ✔ ✔ ✔ Hydrocarbons (hexane, heptane, methane) ✔ ✔ ✔ ✔ Methanol ✔ ✔ ✔ ✔ ✔ Benzene ✔ ✔ ✔ THF ✔ ✔ Toluene ✔ ✔ DMF ✔ ✔ ✔ ✔ DMSO ✔ ✔ ✔ ✔ Ether ✔ ✔ ✔ Chlorinated solvents (methylene chloride) ✔ ✔ ✔ Alcholos (ehtanol) ✔ ✔ ✔ ✔ ✔ ✔ Acetic acid ✔ ✔ ✔ ✔ Acetone ✔ ✔ ✔ Phenol ✔ ✔ ✔ ✔ ✔ Cyclohexane ✔ ✔ ✔ ✔ * PTFE/silicone/PTFE has the same chemical compatibility of PTFE only until punctured
- Literature
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Agilent Vials and Sample Containment Brochure
Contains details of Agilent's range of vials and closures
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An Agilent Septum is Not Just a Septum - White Paper
Technical overview on Agilent's septa
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