The EPA sample vial is a standard 24-400 threaded sample vial, which can be used for sample loading and storage of environmental samples or various chemical substances; The brown sample vial is suitable for chromatographic analysis and sample storage of light unstable samples; The septum is made of polytetrafluoroethylene and high-quality silica gel as raw materials, which ensures that the gasket is non-toxic and effectively prevents puncture and debris removal, which meets the requirements