1. Pressure-Sensitive Liners (PS Liners)
How they work: These liners stick to the bottle mouth when the cap is tightened. Adhesion happens without the need for heat or sealing equipment.
Advantages: Easy to apply, low cost, and suitable for small production runs.
Best for: Powders, dry goods, or short shelf-life products.
Limitation: Less effective for liquids or products requiring long-term sealing.
2. Induction Seals (Foil Seals)
How they work: A layer of aluminum foil is bonded to the bottle mouth using electromagnetic induction heat.
Advantages: Excellent leak prevention, strong tamper evidence, and superior barrier against moisture, oxygen, and aroma loss.
Best for: Food, pharmaceuticals, health supplements, and cosmetics-especially for export and long-distance shipping.
Limitation: Requires induction sealing equipment.
3. Foam Liners (EPE Liners)
How they work: Made from expanded polyethylene (EPE), these soft liners compress between the cap and bottle neck.
Advantages: Good cushioning, reseal capability, and compatibility with many bottle types.
Best for: Non-aggressive liquids, household products, and dry goods.
Limitation: Lower barrier performance compared to foil-based liners.
4. Pulp and Foil (or Pulp and Poly) Liners
How they work: A pulp backing supports an aluminum foil or polyethylene barrier layer.
Advantages: Improved barrier against moisture and odor transfer.
Best for: Oils, fragrances, and aroma-sensitive formulations.
Limitation: Higher cost compared to standard foam liners.
5. Vented Liners
How they work: Special vent membranes allow gases to pass through while keeping liquids inside.
Advantages: Prevents bottles from bulging or collapsing due to pressure changes during shipping or temperature variation.
Best for: Products that release gas or are sensitive to pressure changes, such as bleach, peroxides, or foaming liquids.
Limitation: More specialized and costlier than regular liners.
Comparison Table of Common Gasket Types
| Gasket Type | Seal Strength | Tamper Evidence | Best for | Equipment Needed |
|---|---|---|---|---|
| Pressure-Sensitive Liner | Medium | Low | Powders, dry products | No |
| Induction Foil Seal | Very High | Strong | Food, supplements, liquids | Yes |
| Foam (EPE) Liner | Medium | None | Household liquids, dry goods | No |
| Pulp & Foil Liner | High | Medium | Oils, fragrances | No/Optional |
| Vented Liner | Medium | None | Bleach, gas-releasing items |