Amber EPA/VOA Vials – Sci-Spec PTFE Lined Closed Top Caps – PreCleaned 2000 Class. Available in assorted capacities, these vials are made of laboratory quality borosilicate glass as recommended by the EPA. Precleaned and accompanied by a closed top PTFE lined cap. $69.07 – $72.76. SKU. ml. Cap Size. Unit.