20ml amber precision screw- thread vial, round bottom 22.5*75.5mm

These magnetic screw caps with headspace vials and septa provide a convenient and reliable solution for headspace and SPME (Solid Phase Microextraction) applications in chromatography laboratories. Compared with traditional magnetic crimp caps, these closures are easier to open and close, simplifying sample preparation and reducing handling time.
The thin septa design helps minimize septum coring and provides better needle protection during injection, improving overall analytical reliability. This makes the system suitable for both headspace analysis and SPME applications, where sensitive sampling needles and fibers require careful protection.
Each septum features a special pre-cut design, where the silicone layer is pre-slit while the PTFE layer remains intact. This configuration allows safe and smooth penetration of delicate SPME fibers while maintaining excellent sealing performance and significantly reducing the risk of coring.
This headspace vial system has been tested and approved by CTC for use with Combi PAL autosamplers (including Gerstel, ATAS, and Agilent systems). It is also recommended by Agilent for the G1888A headspace sampler, by Shimadzu for the AOC-5000 autosampler, and by PerkinElmer for TurboMatrix autosamplers (models manufactured after September 1, 2006), ensuring compatibility with a wide range of analytical instruments.
Each kit includes a 20 mL clear glass precision screw-neck headspace vial (22.5 × 75.5 mm), along with a silver magnetic screw cap featuring an 8 mm center hole and a compatible septum. This combination provides a reliable and easy-to-use solution for laboratories performing volatile compound analysis, headspace GC workflows, and SPME sample preparation.