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Circumvent^® & AirFoil^®

Circumvent^® and AirFoil^® are patented vented liner systems developed to eliminate the swelling or collapsing of plastic containers by allowing them to “breathe” without leaking. These innovative vented liners replace traditional foam, pulp, paper, or foil liners and provide a leak-proof seal.

PSI converts standard foam and heat induction liner products to a vented format by utilizing various breathable materials including polytetrafluoroethylene (ePTFE) membrane. This membrane has a unique microporous structure that repels liquids, yet safely allows the free passage of air to maintain equilibrium within a closed container.

Containers can be vented in two ways:

• Via a hole in the cap
• Via grooved-back liner (no hole necessary)

Benefits of Circumvent:

• Repels liquids
• Allows free passage of air to equalize pressure in containers
• Eliminates container bloating and paneling
• Provides leak-proof seal
• Broad chemical compatibility
• High liquid intrusion rating

Benefits of AirFoil:

• Same characteristics as Circumvent
• Provides important tamper evidence
• Ensures a positive seal between cap and container
• Compatible with many container substrates/resins
• The only vented, non-leaking heat induction foil available

Determining the Right Products for Your Needs

Circumvent 1 & AirFoil 1 – are only recommended for use on high surface tension liquids. They are the most economical venting systems.

Circumvent 4 & AirFoil 4 – are recommended for solutions containing low surface tension liquids such as oils, fragrances, degreasers, cleaning solvents, soaps, and other surfactants. Enhanced membrane properties prevent leakage from these more aggressive solutions.

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