The sample vials

Come and choose a satisfactory sample bottle for you!

When doing experiments, do you feel that your sample vials are not easy to use? Because a small sample vials leads to unsatisfactory experimental results is not worth the loss. Selecting a suitable sample bottle is also a skill that laboratory friends need to master. Today, we will take you to see how to select the sample vials. Come and see.

First of all, we should be familiar with the classification and characteristics of each part of the sample vials, and select the sample vials suitable for our research project according to our own needs

01. Bottle body

Bottle with / without writing scale

Marking the sample can help your experiment avoid unnecessary accidents, or forget the composition of the contents of the bottle due to long storage.

With writing scale (left), without writing scale (right)

02. Whether with insert

If your sample volume is small, you can use a vial with an insert (liner) tube to increase the liquid level to facilitate injection. Compared with the flat-bottom intubation, the volume of the sample to reach the liquid level can be less, and the recovery is also better than that of the flat-bottom intubation, but the flat-bottom intubation has more advantages in price, and the inner intubation bracket acts as a fixed The role of the position of the inner cannula can be automatically calibrated in the center position, protecting the needle and making it more convenient to take.

Flat bottom insert (left), insert with polyspring (middle),
Conical insert(right)

03. Bottle head specifications

Crimp bottle: It has a strong seal, but requires manual crimping and crimping.

Screw-top bottle: Easy to use, the screw-top design can save manpower and time, and it is also the most popular bottle-top closure method at present.

Snap-top bottle: It can be pressed without tools, which is more convenient than threaded mouth, but the sealing performance is not as good as that of threaded mouth.

Crimp (left), Screw (middle), Snap(right)

04 Septa

Non Slit Septa: The most commonly used septa type, but the pins are more laborious to use, and sometimes debris or septa are prone to fall into the sample, affecting the injection.

Pre-slit septa: It is relatively simple to insert the needle into the septs, and it is not easy to generate debris, but it is easy to cause sample volatilization when used for a long time.

Double-layer membrane septa: The upper and lower double-layer PTFE membranes can protect the silica gel in the middle layer from being corroded by the volatile gas of the solution, and have good physical stability.

Bonded Septa: The septa is connected to the cover in one piece, which can greatly reduce the situation of the septa falling off during use.

Non-slit septa(left), pre-slit septa (right)

05. Septa material


• Recommended for multiple injections and sample storage;

• Has excellent resealing properties;

• Chemical resistance of PTFE before puncture and chemical compatibility of silicone after puncture.


• Has the same physical and chemical properties as PTFE/silicone;

• The double-layer PTFE structure is more stable than the single-layer structure, and can protect the middle layer of silicone material from corrosion.

P.S. During the installation and use of the septa, it should be noted that due to the difference in tolerance and texture between the PTFE layer and the silicone layer, the silicone side of the septa faces the injection needle and the PTFE side faces the sample solution during installation.

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