The Lab Depot | VOA Vials CLASS 3: (Certified) - VOA (EPA) Vials - Vials VOA (EPA) Vials VOA Vials CLASS 3: (Certified) Generally used for volatile organic compound analysis and sample storage, our 20mL, 40mL, and 60mL VOA vials are available in clear or amber borosilicate glass with a choice of .125" or .100" PTFE/Silicone septa.