The crystal clear TPX offers good transparency and chemical resistance. TopSerts are available the vials Hplc Autosampler Vials are 12*32mm ,chromatography analysis contains LC,HPLC ,GC ,Headspace analysis ,MS,GC-MS . Features. 1. 2 ml, 12 x 32 mm 2. Color: Clear & Amber 3. Available in unique packaging designed to reduce vial breakage 4.