standard opening 40ml VOA vials Sigma 40 Ml Vial at Thomas Scientific 40 mL Septa Vials. I-Chem. Certified to contain . 50 ppb Total Organic Carbon Standard 40 mL septa vial is clear borosilicate glass with 0.125 in. thick, I-CHEM blue, PTFE/silicone septa in an open-top 24-414 polypropylene cap.