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Vial Caps
Vial caps play a crucial role in chromatography. These small but essential accessories ensure that samples are securely sealed and protected from contamination, which is of paramount importance for the accuracy and reliability of the analysis.
In chromatography, there are different types of vial caps, each offering specific advantages. The most common types include screw caps, crimp caps and snap caps. Screw caps offer easy handling and are reusable, making them ideal for routine applications. Crimp caps, on the other hand, offer an extremely tight seal and are therefore particularly suitable for samples that need to be stored under demanding conditions. Snap caps allow quick and easy handling, making them ideal for applications where time is of the essence.
The materials from which vial caps are made are also varied. Commonly used materials are polypropylene and aluminium. Polypropylene caps are chemically inert and resistant to many solvents, while aluminium caps provide a particularly tight seal.
Another important aspect is the type of seal. Vial caps can be fitted with various seals, such as PTFE/silicone seals, which offer excellent chemical resistance and a high level of tightness. These seals prevent sample evaporation and protect against contamination, which is particularly important when analysing sensitive substances.
Choosing the right vial caps is crucial for the quality and reproducibility of chromatography results. You must ensure that the caps and seals are compatible with the solvents and samples used to avoid unwanted interactions. In addition, the caps should be easy to handle and provide a reliable seal to ensure the integrity of the samples during storage and transport.
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