2021年8月20日 · The sample vials includes Autosampler Vials, headspace vial, storage vial, TOC Vial, etc. This time, we mainly introduce the selection method of Autosampler Vials. 1. Sealing method of sample Vial. Screw Cap: it provides a sealing method with low evaporation, reusable and less damage than the tong mouth cover, and does not need additional tools.