Qorpak Amber Borosilicate Glass Vial, Black Phenolic Polyseal™ Cone Lined Cap

The attached black phenolic (thermoset) caps with Polyseal™ cone liners form an exceptionally tight seal to serve as a chemical barrier. This Polyseal™ cone liner molds itself around the finish as the cap is screwed on, virtually eliminating leakage, evaporation, contamination, binding and backing off. These caps have a wide range of uses; from liquids, to soaps, to macro-invertebrates.