EPA/VOA Vials 2 VOA Vials are available in clear and amber in sizes 20ml, 40ml, and 60ml. Our vials are made of EPA-recommended laboratory quality borosilicate glass, and open top caps are made from a heat-resistant polypropylene resin. Our septa is made from Virgin Teflon~ and FDA grade silicone. Sci/Spec Precleaned (2000 class) and QA