128 oz (3840 ml) Natural HDPE handled round jug with 38-400 black phenolic polycone lined cap attached. Thermoset or phenolic (bakelite) caps are known for providing the widest range of chemical compatibility and for being the most temperature tolerant of plastic closures. They also provide the most consistent adherence to close dimensional tolerances. Ideal for pharmaceutical applications. thermoset closures cannot be remelted after they are formed. Common in thermoset in resins include urea, phenolic, and melamine. Polycone lined phenolic caps form an exceptionally tight seal and offer a good 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.