Nov 16, 2020 · LC/GC Certified Vials are UV-tested by HPLC. The HPLC test Vial Closures Guide Vials are available in three closure typescrimp,snap,and screw cap. Each closure has its advanes. Type 1,33-Expansion Borosilie Glass Analytical laboratories use type 1,33-expansion glass,the most chemically-inert glass obtainable,in for high