The 10 Best Lab EPA Vials To Buy - June 2021 Edition. Ultra Clean EPA VOA Vial. Type 1 Class A borosilicate glass; Capacity 40Ml. Screw neck vial, 40ml vials 10ppb Certified with Cap and Seal,giving you confidence in the quality of your TOC measurements ; Aijiren vials are clean for EPA Quality, and much clean than another famous brand vials.