A range of vials for environmental water analysis also with EPA certification. Available in various volumes with screw neck 24-400, in clear or amber glass that meets ASTM Type I Class A and USP Type I standards. Screw caps made of high purity polypropylene and silicone / PTFE septa ._cc781905-5cde -3194-bb3b-136bad5cf58d_ Ideal for use in Purge & Trap systems. Class 300 vials include batch certification for VOC component analysis at less than 0.5ppm. Vials for TOC of 9, 24, 40 and 125 ml. The 40ml vials fit most automated TOC instruments and are also available in the certified ≤ 10 ppb TOC version. Leading TOC tool manufacturers use and recommend these vials.