Which Liner Is Best for Your Products?

Liners play a critical role in creating an airtight seal for your packaging. The right liner helps preserve product quality by locking in flavorful terpenes while keeping oxygen out.

Because different products have different preservation needs, liner performance matters.

After extensive liner testing for both flower and concentrate packaging, we’ve upgraded our standard packaging to foil liners—delivering stronger barrier protection and improved freshness across applications.

👉 Read more about our Concentrate Preservation Study here.

Foil (Esterfoil) Liners

• Esterfoil liners are our standard liner for child-resistant closures. The foil layer provides an effective barrier against volatile terpenes, minimizing permeation through the liner and helping maintain product integrity by reducing evaporation.

PTFE Liners (Teflon ®)

• PTFE liners are a premium option for glass concentrate jars, designed to reduce sticking between the liner, closure, and jar. This makes them especially well suited for viscous concentrates such as sauce and live resin. In internal preservation testing, PTFE liners demonstrated minimal to no volume loss over a nine-week evaluation period. 

Heat Seal Liners

Induction heat seal liners are a specialty liner that bonds directly to the bottle or jar, creating an airtight seal. This provides an added layer of protection against leakage while also serving as a tamper-evident barrier. In our preservation study, eBottles jars with induction heat seal liners showed no volume loss over a nine-week period, making them an optimal choice for long-term product integrity.

Main benefits: 

• Hermetic seal: Airtight bond with an impermeable foil layer
• Tamper evident seal: Available with Clean Peel or Welded Seal 
• Ability to Automate
• Cost effective
• Relatively inexpensive
• Can be used for flower, edibles and concentrates. 

Types of Heat Seal Liners:

Lift and Peel Heat Seal Liners 

• Lift and Peel liners are friction fit heat seal liners with a convenient pull tab on top. 
• These liners create a “clean peel” seal. We typically supply these liners with a PP foam backing to keep the product fresh after opening.

Tri Tab Heat Seal Liners

• Tri Tab Heat Seal liners are composed of foil laminated to a foam backing for rigidity and friction fit inside the closure. 
• The tabs are a convenient way to remove the foil and also help with liner retention. 
• We typically supply these liners with a PP foam backing to keep the product fresh after opening.

Safeguard (2 Part) Heat Seal Liners

• Safeguard heat seal liners are two-part liners typically consisting of a pulp backing and a foil layer held in place by a wax coating. During induction sealing, the wax melts and is absorbed into the pulp while the foil bonds to the jar, creating a secure seal. Liner retention is not a concern, as the liners are glued into the closure.

Pressure Sensitive Liners (PS-22)

• Pressure Sensitive liners use a torque-activated adhesive to bond a styrene foam liner to the container opening. While effective for general sealing applications, they are not recommended for cannabis flower due to limited oxygen barrier performance and the potential for product shake to stick to the liner.
  
• Note: Allow 24 hours for the adhesive to set before removing the closure.

Foamed Polyethylene (PE) Liners (F-217) 

• PE liners are a widely used, all-purpose liner featuring a compressible foam structure that creates a reliable seal. They offer low moisture vapor transmission, good cleanliness, and effective taste and odor resistance, making them suitable for applications including carbonated beverages.

Plug Style Liners

• Our LUG style liners act as an airtight plug in plastic pre-roll and vape cart bottles.
• Independently sealing.