VOA Vials are most commonly used for Volatile Organic Compound Analysis. These vials are Type 1 Borosilicate glass available in Clear and Amber. Vials come with a choice of 1pc. 24-414 white cap and sonically bonded septum, or 2pc. 0.125 in. PTFE/Silicone septum press fitted into 24-414 white hole closure.