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Learn about Aijiren Sample Vials Caps&Septa


Many customers attach importance to sample vials but ignore the choice of caps and septa, which is actually quite important. Better experimental results can be obtained by selecting the appropriate septum. Now I have compiled a set of detailed guides, and let me choose the right caps and septa according to different needs!


It has the anti-corrosion properties of PTFE and the sealing properties of silica gel and has a wide temperature range of -40℃-200℃

For normal-phase solvents with strong penetration, such as n-hexane, dichloromethane, etc., if the liquid level is too high, it will cause swelling. (PTFE: Teflon, Teflon)

9-425 PTFE septa

Pre-slit PTFE/Silicone

Use when using a blunt or thin needle for the syringe;

Eliminate the current situation of needle blockage at the bottom end after injection;

Prevents vacuum from forming in vials;

Operating temperature range -40℃ to 200℃.

9mm PTFE and Silicone septa


Recommended for multiple injections;

Autoclavable and autoclavable;

For internal standards, trace analysis or experiments with long injection intervals;

Operating temperature range -40℃ to 200℃;

PTFE/silicone/PTFE septa have the same chemical compatibility as PTFE septa until punctured. We recommend PTFE/silicone/PTFE septa for susceptible samples as the PTFE layer acts as a chemical-resistant barrier.


Pre-bonded cover PTFE/silicone septa

The caps and septa are bonded together using an adhesive-free bonding process. The PTFE layer contact reagent of the composite spacer has good chemical inertness, acid resistance, alkali resistance, temperature resistance, and anti-sticking resistance. At the same time, the elasticity of the silicone rubber can ensure the sealing performance; it can also ensure that the septum does not detach from the cover during transportation. During the puncture process, even if the injection needle is thick and blunt, it can also ensure that the gasket is not poked into the sample bottle.


Butyl rubber stopper

Temperature range -50℃ to 150℃;

Suitable for organic solvents, and acetic acid; good sealing performance can effectively prevent air leakage.


PP septa

Economical, suitable for storing non-corrosive samples, long-term storage of liquids is not recommended, only room temperature storage.

9mm Screw cap



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