Choosing the Best Cap Liner Materials

Pulp/Vinyl Lined Caps: Perfect for general use. The sealing liner is made of a vinyl coating applied to high density polyethylene coated paper and then it is laminated to pulpboard. This general purpose liner is commonly used for food, beverage, medical and chemical applications packed at less than 120° F., including mild acids, alkalis, solvents, alcohols, oils and aqueous products; not recommended for active hydrocarbons or bleaches.

Rubber Lined Caps: Black phenolic caps with rubber liners are autoclavable. This liner is FDA approved for food and pharmaceutical applications. Excellent properties of resilience, resistance to moisture vapor and relatively low gas transmission. Also widely used for packaging injectables. Great for culture work. They also provide the most consistent adherence to close dimensional tolerances. Available in Phenolic caps.

Aluminum Foil Caps Liner : These caps are typically used for food applications. Free of odor and taste problems. Also can be used for non-acid, non-alkaline products. Great for organic solvents, chrome cleaners, brake fluids and mineral oils. Available in Phenolic and Metal caps.

Tin Foil Lined Caps: These caps offer good chemical resistance and are typically used with solids and powders. Good resistance to hydro-carbons, alcohols, ketones and oils. Not recommended for acids and alkalis. Available in Phenolic caps.

Polyseal & Cone Lined Caps: These caps form an exceptionally tight seal and offer a good chemical barrier. This liner molds itself around the sealing areas of the finish as the cap is screwed on, virtually eliminating leakage, evaporation, contamination, binding and backing off. Great for everything from liquids, to soaps, to macro-invertebrates. Available in Phenolic caps.

Polyethylene (PE) Foam Lined Caps: These polypropylene caps have excellent sealing characteristics and offer good chemical resistance including acids, alcohols, alkalis, aqueous products, cosmetics, household oils and solvents.

Unlined Caps: Unlined polypropylene closures are available in white or black. These caps are autoclavable and are suitable for many dry products.

Plastisol Lined Metal Caps: Metal caps with a Plastisol liner offer excellent resistance to mild acids as in food products. Permits “hot fill” operations to effectively produce a vacuum seal.

Pulp/Polyethylene Lined Metal Caps: These metal caps are a great general purpose closure. They are ideal for powders and non-acidic food products and consumer products such as jar candles and honey.