JG Finneran 40 ml Clear VOA Glass Vial with 24-400mm Solid Top White Polypropylene Closure (PTFE Lined), Class 3 - Precleaned & CertifiedGenerally used for volatile organic compound analysis and sample storage, 20mL VOA vials are available in clear borosilicate glass with a PTFE lined cap. The assembled vials are available Precleaned/Certified in accordance with recommended E.P.A. protocol