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4 mL HPLC vial refers to a specific type of vial used in High-Performance Liquid Chromatography (HPLC) systems. HPLC vials are small containers made of glass or sometimes plastic, designed to hold samples that will be analyzed using HPLC techniques.
In the case of a 4 mL HPLC vial, it means that the vial has a maximum capacity of 4 milliliters (4 mL) of liquid sample. These vials typically have a narrow opening at the top, which can be sealed with a cap or septum to prevent sample evaporation or contamination.

20mm crimp-top headspace vials are a type of laboratory vials commonly used in gas chromatography (GC) and gas chromatography-mass spectrometry (GC-MS) applications.
These vials are specifically designed for the analysis of volatile compounds in samples.
Headspace analysis is used when analyzing volatile or semi-volatile compounds that can be released from a solid or liquid sample into the gas phase.
This technique is particularly useful for samples that would be difficult to directly inject into a GC system or when analyzing volatile compounds in complex matrices.