Phenolic caps are chemically inert and have a high heat tolerance. Cap includes a polyethylene cone liners (polycone). This liner is cone shaped and provides a seal between the top of the cap and inside diameter of the bottle creating a tight seal to prevent leakage. These oil-resistant plastic liners prevent air and moisture from entering the bottle, thus preserving the product housed inside. Polycone liners also aid the preservation of beer, wine, and alcohol.
Technical Drawing - 38-400 Black Phenolic Cap with Polycone liner - 213 KB