Common Liner Descriptions

F-217

Co-extruded material. Foamed low-density polyethylene core between two solid layers of low density polyethylene also called just "foam"

S-22

A pressure sensitive foam liner with one adhesive side that sticks to the container with the pressure used to place the closure on the container. When the closure is remove the pressure sensitive liner remains on the top of the container. Note that this liner is not tamper evident. Recommended for dry products.

Linerless

A closure which has been engineered to function in specific applications without the use of an additional liner

P/Poly

Polyethylene film laminated to paper and bonded to pulpboard

P/RVTLF

Vinyl coating applied to high density polyethylene coated paper laminated to pulpboard

Plastisol

Vinyl chloride resin applied as a liquid and baked to a final form, usually appears like a gasket around the inside of the closure used in metal closures for food applications

Polycone

Cone-shaped low density polyethylene liner originally designed by PolySeal for glass bottles

Teflon Discs

Solid virgin Teflon TFE .015"

Unlined

A closure without a liner – this is NOT the same as a “linerless” closure which is designed not to require a liner

Heatseal

An induction heatseal foil liner bonded to a bottle that confirms “tamper evident” packaging. Liner will need to be specified based on bottle resin (HDPE, PET/PVC, PP, etc.)

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