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Vials, also called injection or sample vials, are small bottles which are used in medicine and in chemical laboratories for the filling of drugs, solutions or suspensions. These are available in different capacities and are sealed with a PTFE septum or a rubber stopper.
The correct choice of the sample vial depends on the intended use. If the sample is only to be stored in it, material and volume are the decisive factors. Most vials are available in hydrolytic Class 1 white and brown glass as well as TPX (polymethylpentene) or PP (polypropylene).
In addition to normal glass vials, which are available for special analyzes with purity certification, we also carry silanized glass products. Silanized glass vials are used to reduce the absorption of polar compounds on the surface of the glass container (eg in protein analyzes). Some compounds, such as amines, proteins or phenols, tend to react with the glass surface. The silanization process prevents this by deactivating the glass surface.
In some special applications, such as atomic absorption, water or protein analysis, capillary electrophoresis, etc., even plastic vials must be used. We offer a wide range of plastic vials and plastic micro vials made of different materials (PP, TPX) . For applications that require sealed vials (e.g. already crimped or screwed bottles), such as in the tobacco industry, we can also supply any kind of vial with a closure of your choice pre- locked . Please note, however, that the vials must be removed from the CleanPack packaging for the sealing process and therefore can not be labeled as "in the clean room".
EPA vials can be supplied with or without a purity certificate, depending on the requirements of the end user. In addition, EPA vials can also be delivered with screwed-on closures.
We also provide vials whose glass is made from the 1st hydrolytic class. Glass of the 1st hydrolytic class is very hard and has a small coefficient of expansion, even in large temperature fluctuations. It has excellent chemical resistance to acids and neutral solutions, even against alkaline solutions due to the relatively low basicity. The higher density of the glass surface gives it a higher water resistance. In glass of the 1st hydrolytic class one differentiates between glass with coefficients of expansion 33 (type 1, class A) and 51 (type 1, class B), whereby brown glass is only available with expansion coefficients 51 worldwide. The lower coefficient of expansion indicated by 33 implies that higher temperatures must be used in this harder clear glass to process it.
When injecting directly from the sample vial for HPLC and GC applications, the vial must not only have a suitable material but also be compatible with the used autosampler. In the case of HPLC or GC applications, vials with the outer dimensions 32 x 11.6 mm are used for most autosamplers.
However, the vial shape has some details that must be compatible with your autosampler:
The vials have a volume of 1.5 ml. Vials with an integrated cone are available at the bottom of the bottle for applications where nearly the entire sample volume is to be injected. If only small sample volumes are available, you can reduce your vials by matching microintensions with a volume of 0.1 - 0.2 ml.