About Sample Vials Development and Quality

Sample vials development
The material of the sample vial is neutral borosilicate glass, which will not cause the precipitation of metal ions and affect the analysis results. In order to prevent the sample from being adsorbed, some sample vials are also silanized. Sample vials are made of glass raw materials in the category-Class 1 borosilicate glass with an expansion coefficient of 51. This type of glass does not affect the analytes in your sample matrix, which means that vials are an indispensable solution for your valuable samples.

The main contents of the sample vial are clear. It is for this reason that external light can easily pass through the container, causing the contents to change and deteriorate. At present, a colorless and transparent sample vial that can block ultraviolet rays has attracted widespread attention by adding a metal oxide that absorbs ultraviolet rays into glass. At the same time, the complementary color effect is used, and some metals or their oxides are added to fade the colored glass.

HAWACH sample vial characteristics
1. Extremely high inertness: The inertness of the sample vial can reduce the peak variability of the analyte and ensure that you are confident in the results.
2. Consistent performance: Each product of each batch of the sample bottle has consistent performance, which saves you more time for troubleshooting and re-running samples.
3. Certificate of Analysis: The sample bottle is equipped with an analysis certificate, which can guarantee you that these sample bottles can work normally even in harsh environments.
4. Can be matched with various vial cap designs: sample vials can use your existing 2 ml autosampler bottle caps, bringing more convenience to your inventory management.
5. Fewer septa issues: HAWACH has continued to improve septa to actively reduce leaching, chipping, blocking, pushing, stiffening, and adsorption and absorption issues.
6. Fast delivery: HAWACH’s exclusive distribution centers ensure that your order will be delivered to your laboratory in time.

Snap Top Sample Vials
Amber Crimp Top HPLC Sample Vials

HAWACH’s sample vial has excellent sealing performance, which can effectively avoid sample evaporation. The vial and the corresponding 11mm aluminum cap can be easily and quickly combined with the jaw capping tool. The vial can withstand heat and pressure, and can also be used for chemical reactions, especially for vials with thread openings, with white open caps and thick PTFE/silicone gaskets, which can be used as anhydrous and oxygen-free reaction vials.

To prevent contamination and avoid damage to the syringe and instrument, the correct sample vial septum selection is crucial. Here are some issues you should pay attention to:

1.Temperature control
At higher temperatures, the septa will degrade and cause sample contamination. Rubber septa are only stable below 90℃, so they are not suitable for high-temperature applications. Generally, PTFE-lined silicone rubber septa are the choice for various temperatures.

When the needle diameter is too large or the septum material cannot withstand multiple injections, scraps will be generated. At this time, the septum material will fall off into the sample vial and contaminate the sample. Here’s how to prevent scraps:
a. Select a PTFE-lined septum to prevent the septum material from entering the sample;
b. Make sure the needle is not damaged, consider using a side hole needle instead of a tapered needle;
c. Adopting pre-perforated septa can almost completely eliminate scraps;
d. For highly sensitive samples, PTFE-lined septum can act as a chemical-resistant barrier.

3. Resealability
Resealing is an important factor to consider when choosing a septum. PTFE / red rubber septa are not recommended for multiple injections or samples that need to be stored for later analysis. PTFE/silicone/PTFE is always the choice when it takes longer between injections or when adding any type of standard sample.