Three-layer co-extruded liner consisting of two solid polypropylene (PP) outer layers surrounding a central layer of closed-cell foamed polypropylene. The entire structure forms a single polymeric unit and therefore cannot delaminate.

The foamed central core provides the resilience and compressibility required for effective sealing, while the solid outer layers help prevent evaporation and product penetration.

The liner is typically inserted into aluminium, plastic or metal closures and becomes an integral part of the closure. When the bottle or jar is opened, the liner remains inside the closure.

Suitable applications:

• Alcoholic and non-alcoholic beverages
• Dietary supplements
• Food products and oils
• Cosmetics and pharmaceutical products

Properties:

• Mechanically strong
• Excellent chemical resistance
• Good compressibility
• Single-piece co-extruded construction – no lamination or adhesive
• No discolouration
• Good machinability
• No absorption
• Good application and removal torque characteristics
• No dusting – foam particles cannot come loose
• Non-toxic, odourless and tasteless
• Cost-efficient – no additional lamination process required
• Good heat resistance
• Steam sterilisable