Cap Liner Types and Functions



Choosing a liner type and style is one of the most important factors of cap selection. Certain products such as chemicals, consumer products or foods may require specialized liners. Different liner materials may be used for moisture barriers, chemical resistance, consumer safety, or preventing leakage. Depending on the material, cap liners may also influence the cost of your finished product. For more information on types of caps and closures, visit the Selecting Closures info page . As always, be sure to test your product with the liner you choose to be sure they are compatible.


Polyethylene Foam Liners


An ideal general-purpose liner material, the compressible PE foam creates a stable seal.
Buy PE Lined Caps

Benefits:
  • Good resistance to acids, alkalis, solvents, alcohols, oils, household cosmetics, and aqueous products.


Disadvantages:
  • Fair to poor resistance to hydrocarbon solvents

PS22 Liners


A pressure sensitive foam liner with one adhesive side that sticks to the container with the pressure used to secure the closure onto the container. When the closure is removed, the pressure sensitive liner remains on the top of the container.
Buy PS 22 Lined Caps

Benefits:
  • Require no machinery for application
  • Provides an added layer of protection while storing

Induction Liners

Induction liners have several layers: pulpboard, wax, foil, and a polymer coating. When passed through an induction machine, the heated foil melts the wax and polymer, creating a hermetic seal with the container when solidified.
Buy Induction Caps

Benefits:
  • Tamper Evidence
    Once the liner has been removed, it cannot be reapplied to the container.
  • Hermetic Seal
    Creates an airtight seal to help prevent leakage


Disadvantages:

Poly Vinyl Liners


A pulp / poly liner consists of a poly-vinyl film adhered to a white pulp paper backing.
Buy PV Lined Caps

Benefits:
  • Chemical resistance to mild acids, alkalis, solvents, alcohols, oils and aqueous products


Disadvantages:
  • Not recommended for active hydrocarbons or bleaches

Polyseal™ Liners

Made from LDPE plastic, these cone liners provide a wedge-type seal across the top of the container as well as the inside diameter. Commonly used for liquid products.
Buy Cone Lined Caps

Benefits:
  • Stress crack resistant
  • Superior torque retention
  • Excellent sealing characteristics

Teflon® PTFE Liners


A variety of liners may have Teflon® facing, such as silicone or PE foam. A Teflon® -faced liner will maintain the base liner's sealing properties while adding superior chemical resistance.
Buy Teflon® Lined Caps

Benefits:
  • Withstands volatile solvents, sensitive compounds and corrosive chemicals that would degrade other liner materials.

Disadvantages:
  • Expensive

Foil Liners

A polyester film laminated to aluminum foil, bonded to pulp board.
Buy Metal Foil Lined Caps

Benefits:
  • Good barrier properties
  • Good resistance to hydro carbonates, oils, ketones and alcohols



Disadvantages:
  • Not recommended for acids or alkalis.

Plastisol Liners

A plastic gasket on the inside of a metal closure that creates an airtight seal with the container when properly heated and cooled.
Buy Plastisol Lined Caps

Benefits:
  • Tamper evidence
  • Hermetic seal

Disadvantages:
  • Must be used with containers that can withstand high heat.






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