How To Select The Suitable Sample Vials
Hawach sample vials are very small but often used compared with some other instruments in laboratories, which are sufficiently related to the efficiency, the process and the data of experiments. Accordingly, it is particularly important to select and use a suitable sample vials.
When the sample vials are not properly selected for the experiments, there may exist a lot of problems. The incorrect sealing of the vials leads to the volatilization and the loss of analyte. The interaction of solvents and spacers produces stray peaks. The improper vials will cause mechanical damage to the automatic sampler. Such problems influence the experiments.
Therefore, we should consider the following three aspects carefully when selecting the sample vials.
01 the septa
The first kind of septa is made of PTFE/silica gel. It is applicable to multiple injections and sample storage. It has excellent re-sealing characteristics. This septa has chemical resistance of PTFE before pierced, and chemical compatibility of silica gel after piercing.
The second kind of septa is made of PTFE/silica gel with pre-incision. This septa provides good ventilation to prevent producing a vacuum inside the sample vial so that we can use the vials to achieve excellent sampling reproducibility. Besides, this septa can eliminate the blockage of the bottom needle after sampling. It is also applicable to multiple injections.
02 the caps
The screw cap is the universal one with good sealing effect, and mount the spacer mechanically without other tools. The jaw cap has aluminum clamp with good sealing effect. It can adapt to the high-temperature experimental environment. The bayonet cap is very suitable for storing powder samples. But its sealing effect is not as good as other caps.
03 the vials
The vials are usually made of glass and have two colors, transparent and color. The glass is universal and acid-resistant. The brown vials is for photosensitive samples.