Our vials are made of EPA-recommended laboratory quality borosilicate glass, and open top caps are made from a heat-resistant polypropylene resin. Chat Now 40Ml Voa Vials - 28X95Mm, 24-400Mm Thread Finish Precleaned - 40mL Clear Vial, Precleaned - 40mL Clear Vial, 24-400mm Open Top Black Closure, 0.125" PTFE/Silicone Top Hat Lined 72/CS Chat Now