20-400 Black Phenolic Caps w/ Poly-Seal Cone Liner
20-400 neck finish, 20mm diameter (0.78”), 400 thread finish, 3g weight - Our black phenolic (thermoset) caps with Poly-Seal cone liners form an exceptionally tight seal to serve as a chemical barrier. This Poly-Seal cone liner, made of low density polyethylene (LDPE), molds itself around the finish as the cap is screwed on, virtually eliminating leakage, evaporation, and contamination, binding and backing off. These caps have a wide range of uses; from liquids, to soaps, to macro-invertebrates. Ideal for pharmaceutical applications.
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