Alibaba EPA VOA vials with PP cap-Voa Vial Supplier 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. TOC/VOC EPA Septa Vials - Aurora Borealis