Choosing a lining cap material is an essential part of the production process because no two materials offer the same characteristics. As a result, you cannot use materials interchangeably and get the same results. There are many options to choose from, so it can cause choice paralysis. Below, we want to highlight some of the most used materials for cap lining.
Some of the most used lining cap materials include:
EPE 3217: This material contains a single layer of low-density, expanded polyurethane foam. The material is laminated on each side. This type of material is best suited for products with low sensitivity to oxygenation.
EPE 4020: Unlike the 3217 variants, this material is created from low-density expanded polyurethane foam. This material is best suited for products with low sensitivity to oxygenation, including spirits and alcohol.
Lift N Peel: This is considered a specialty closure that contains an easy to open polyester tab: making things convenient for consumers. This flexible and robust material prevents leaking while maximizing the product’s integrity. Another excellent feature is that this material offers compatibility with custom branding sets, distinguishing it from other material options.
Oxygen Scavenging Liner: This material is FDA compliant. It is constructed from a powdered PVC base compound. This compound can safely reduce the risk of oxidation once securely installed inside the cap. It is an ideal option for medical and liquids with low alcohol content.
PE F217: This material distinguishes itself by its white color. It is a foam liner that features low-density polyethylene foam. The core is surrounded by two solid layers of LDPE, which provides enhanced sealing properties. The material is often provided with excellent compatibility with acidic materials/contents.
Saran Tin Liner: This is an FDA-approved material used in conjunction with STEVIN capping technologies. The material is a single layer, low-density EPE, and it has two LDPE layers followed by aluminum foil. Lastly, there is a PET film barrier. This is the most effective way to create a solid and effective oxygen barrier.
Found in metal caps, foil liners are laminated with polyester film and bonded to a pulp board backing. Foil liners are resistant to hydrocarbon based products, such as paraffin wax and oil based products. Foil liners are not recommended for use with highly acidic or alkali products.
