Chroma Lab Technology Limited reaches high-qualthe vials cap and hplc vials &gc vials assemblies for chromatography are compatible for use in the most popular GC and HPLC autosamplers. Each assembly is designed to keep samples pure and contaminant free for accurate sampling. hplc vials &gc vials only; caps are available separately; hplc vials &gc vials & caps convenience packs are also available , Vials has clear and amber, Autosamplers can work day and night ,so the vials & septa & caps are key for their consistant work , We supply different color for all the seals ,and the vials can be customized as your request, HPLC vials& GC vials is part of sample vials which are used for different autosamplers of chromatography instruments .