For chemical experiments, all results are phased, which involves sample storage and sampling issues; and how to choose the right sample vial based on the properties of your own samples, better avoid experimental errors, and save costs.
Sample vials include injection vials, headspace vials, storage vials, TOC vials, etc. This time, we mainly introduce the selection of injection vials.
01 Sealing method of sample vials
Screw mouth: provides low evaporation, reusable, less damaging to hands than crimp caps, and no additional tools are required. It has good sealing and saves experimental time. And it is currently the most used product on the market.
Crimp cap: When clamped correctly, it has good sealing and can be used to provide the best sealing for long-term storage. The crimp cap is not reusable and requires a capping machine for sealing.
Snap: No tools are required when using the snap caps, and its sealing is not as good as that of crimp vials and threaded vials.
02 Color of sample vials
There are two colors: transparent and brown. The color of the vial is determined according to whether the chemical composition needs to be protected from light.
Yuexu Technology uses high-quality raw materials to produce injection vials. Whether it is a brown vial or a transparent vial, it has a very good product quality. We can also provide injection vials made of PP material. If your sample reacts with Si, this is also a very suitable choice.
03 Cap and septa of the sample vial
The cap and septa are divided into two parts: vial cap and septa, which are often used together.
Cap: It is mainly divided into solid cap and perforated cap. Storage vials basically use solid caps, and other injection vials, headspace vials, and TOC vials use perforated caps.
Non-cut septa: The most commonly used septa type, but it is more laborious to insert the needle when using it, and sometimes it is easy to produce debris or the septa falls into the sample, affecting the injection.
Pre-cut septa: It is easier to insert the injection needle into the septa, and it is not easy to produce debris, but long-term use is easy to cause sample volatilization.
Double-layer membrane septa: It is more stable in physical structure than ordinary septas (double-layer membrane septas are two layers of PTFE sandwiched with a layer of silicone, while ordinary septas are one layer of PTFE plus one layer of silicone).
Integrated septa: The septa and the lid are connected in one piece, which can prevent the septa from falling during use.
04 Insert
Sometimes we have a small amount of sample, and we need to use an insert at this time.
insert with support: The support can also fix the insert in the center of the sample vial to ensure the smooth insertion of the needle, and the bottom capacity of this insert is small, and its liquid level height is also the highest.
Conical insert: The liquid level is lower than that of the insert with support, but its cost is lower, which is a more economical choice.
Flat bottom insert: The dead volume at the bottom is large, so its sample liquid level is the lowest in the insert, and its cost is also the lowest.
If a teacher feels that it is troublesome to use an insert, he can also choose a sample vial with a welded insert. The inside is similar to the structure of the pointed bottom insert, and the outside is a normal 9mm vial structure, which can choose the same cap septa as most injection vials.
Post time: Jun-25-2024