28-400 Black Semi Ribbed Skirt Phenolic Cap with Polycone Liner

This 28-400 Black Semi Ribbed Skirt Phenolic Cap is made from durable phenolic resin, known for its outstanding chemical resistance, high heat tolerance, and rigid durability. Its semi-ribbed exterior provides a secure grip for easy application and removal. The cap includes a natural-colored polyethylene polycone liner (LDPE). When tightened, the conical liner forms a wedge-type seal that seals both across the top rim and inside the bottle neck. Highly stress-crack resistant with superior torque retention, this liner prevents leaks, reduces contamination, and limits evaporation—making it ideal for liquids like essential oils and alcohol. This closure features a 28-400 neck finish and is compatible with a variety of matching bottles and containers. Compatibility testing is recommended to ensure the closure, liner, container, and product formulation work together as intended.