Lid Liners

Pressure seal foam liners stick directly to the container rim using downward torque force, whereas induction foil liners require an electromagnetic heating element to melt a hermetic barrier onto the neck finish. Pressure-sensitive foam models provide manual application without machinery for dry flower and solids, while induction foil seals eliminate liquid extract leaks and terpene off-gassing under atmospheric pressure changes.

To cross-reference specs before ordering, check technical specification tables inside each product listing.

• Pressure Seal Foam Liners (28mm, 38mm, 53mm): Tool-free self-adhesive discs that bond when cap closures are tightened firmly.
• Induction Seal Foil Liners (28mm, 33mm, 38mm, 53mm): Hermetic aluminum foil seals engineered for liquid tinctures, oils, and maximum terpene retention.

Match the millimeter designation of the liner directly to the GPI neck finish size of your jar or bottle cap. A 53-400 jar cap requires a matching 53mm liner, while smaller 28mm or 38mm caps require exact millimeter diameters to prevent land-area rim buckling or seal blowout.

Cross-reference cap neck dimensions on our Flower Jar Sizing Chart or explore custom cap options through our Custom Branding Services Menu.

Pressure-sensitive liners fail when container land areas are contaminated with dust or organic terpene oils, or when capping equipment lacks sufficient downward torque. Adhesive backing requires a clean, dry rim and 24 hours of sustained compression under closed caps to achieve complete polymer cure strength.

Review legal compliance guidelines via our State Compliance Regulations Guide.

Yes, induction foil liners require an induction sealing machine to pass high-frequency electromagnetic current through the cap, heating the aluminum foil to weld its polymer coating onto the container neck. Twisting the cap closed manually will not activate the foil seal, making pressure-sensitive foam liners the standard alternative for tool-free filling stations.

Explore packaging layout templates and options in our Educational Label Packaging Guide.

Inventory ships directly from our local Sacramento warehouse so clients can access single units, standard split packs, or master wholesale cases without minimum constraints. Local warehouse stocking eliminates long factory lead times and keeps commercial filling lines operating continuously.