Qorpak Bottle Beakers® with Black Phenolic Polyseal Cone Lined Cap

Attached black phenolic (thermoset) caps with Polyseal™ cone liners form an exceptionally tight seal, offering a reliable chemical barrier. This liner molds itself around the sealing areas of the finish as the cap is screwed on, virtually eliminating leakage, evaporation, contamination, binding and backing off. Great for everything from liquids, to soaps, to macro-invertebrates.