Jan 27, 2016 · With a 40% larger opening, the R.A.M.™ vial is available in polypropylene, clear polypropylene and TPX (polymethylpentene) plastic materials depending on the analyses being performed The 12x32mm plastic vials with a 9mm screw thread finish can be used for applications in ion chromatography, capillary electrophoresis, atomic absorption, pH