To ensure high material purity and product reliability, all of our chromatography vials are converted from Type I borosilicate glass tubing. Purchase options 2019 J.G. Finneran Catalog.indb. Snap Seal Vials, Patented, 12x32mm, 11mm Crimp Finish Borosilicate - A glass that is high in silicate and having at least 5% boron oxide.