Dec 01, 2021 · septa 3.0 mm thick 75mm hs vials flat bottom crimp top-Crimp Aijiren 18mm crimp top headspace vials with flat. The Chromatography Direct range of 20mm Crimp Top Headspace Vials and Caps are available in 20ml Amber and Clear, 10ml and 6ml in a variety of flat and round bottom - suitable for CTC, Perkin Elmer and Aijiren