JG Finneran 40 ml Clear VOA Glass Vial with 24-414mm Open Top White Polypropylene Closure (.125" PTFE/Silicone Lined), Class 1 - StandardGenerally used for volatile organic compound analysis and sample storage, 40mL VOA vials are available in clear borosilicate glass with a .125" PTFE/Silicone septa. The assembled vials are available Standard (QC inspected) in accordance with recommended E.P.A