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1 septum type: PTFE/Red Rubber
Features: Red rubber is a synthetic rubber with a purity lower than that of silica gel and is suitable for routine analysis. Not recommended for multiple injections or storage of samples.
Temperature: -40 to 110 oC
2 septum type: PTFE/Silicone
Features: Good resealing performance, recommended for multiple injections or storage of samples. The white silicone texture is soft and easier to break through the syringe, helping to protect the autosampler needle. Higher purity and reduced peaks.
Temperature: -60 to 200 oC
Features: As before, the pre-cuts are easy to penetrate for those needles with thicker diameter and more blunt needles. However, for volatile solvents, the concentration of the sample will change due to solvent evaporation caused by the opening of the bottle pad. Suitable for storing samples.
Temperature: -60 to 200 oC
4 septum type: PTFE / Silicone / PTFE
Features: Good chemical resistance, creating an inert barrier between the sample and the main carrier of the gasket. The needle is less damaged after puncture, minimizes the volatilization of volatile solvents, and is suitable for trace analysis or other demanding applications.
Temperature: -60 to 200 oC
5 septum type: PTFE/ULB Silicone
Features: high chemical inertness, ultra-low loss, greatly reducing background and noise interference, suitable for high-sensitivity detectors such as mass spectrum
Temperature: -60 to 200 oC
6 septum type: PTFE/ULB Silicone Slit
Features: As before, the pre-cuts are easy to penetrate for those needles with thicker diameter and more blunt needles. However, for volatile solvents, the concentration of the sample will change due to solvent evaporation caused by the opening of the bottle pad. Suitable for storing samples
Temperature: -60 to 200 oC
This is the end of the introduction of What is the choice of the sample vials cap septum. I hope it can help you.
