In the mass-market sectors of skincare, hair care, and household chemicals, the sealing liner is the unsung hero of product delivery. Its primary mission is to provide a consistent physical barrier that prevents leaks and preserves the formulation's viscosity and efficacy. For products that are used repeatedly, such as day creams or liquid soaps, the liner must be 'resilient'—capable of compressing and recovering its shape every time the consumer closes the cap. At Uniseel, our EPE foam liners are engineered to provide this lasting performance, ensuring that your product remains 'Sealed for Safety' throughout its entire lifecycle.
A high-quality foam liner also serves as a critical buffer, absorbing the mechanical tolerances between the rigid bottle rim and the metal cap. This 'soft-touch' sealing mechanism is essential for maintaining a premium user experience and preventing the messy residue that occurs when liquid products bypass the thread. For brands in the USA and Europe, our EPE liners represent a cost-effective yet highly reliable standard for non-sensitive formulations.
Understanding which liner fits your production scale and product chemistry is key to operational efficiency.
PE/EPE Foam Liner: Durable, Flexible & Reusable
The Expanded Polyethylene (EPE) foam liner is the most versatile general-purpose seal in the industry. It consists of a high-density, closed-cell foam disc that provides excellent elasticity.
• Features: Unlike one-time seals, the EPE liner is reusable. It stays securely inside the Unishell cap after the product is opened, providing a reliable seal every time the cap is reapplied.
• Benefits: Highly resistant to a wide range of chemicals, oils, and alcohols. It is the ideal choice for everyday cosmetic and cleaning products.
IHS Liner (Induction Heat Seal): High-Security Hermetic Sealing
The Induction Heat Seal (IHS) liner is a multi-layer aluminum foil structure used to create a permanent, tamper-evident bond to the container rim.
• Features: Requires induction sealing machinery. Provides a 100% airtight and moisture-proof seal.
• Benefits: Mandatory for pharmaceutical-grade protection and prevention of leakage during high-altitude shipping.
Pressure Sensitive Liner (PS & PS22): Machine-Free Efficiency
Pressure sensitive liners utilize torque-activated adhesives to bond to the bottle rim without the need for heat or specialized machines.
• Features: The seal is activated by tightening the cap. Includes the industry-standard PS22 grade for larger diameters.
• Benefits: Simplifies the packaging line for dry goods, vitamins, and powders.
Safety is at the heart of the Uniseel brand. Our EPE foam liners are manufactured from virgin polyethylene and are fully compliant with international safety regulations. Every liner is produced in our ISO Class 7 Cleanroom, ensuring that your packaging components are free from microbial and particulate contamination, making them safe for even the most sensitive skincare applications.
Safety is our absolute priority. Our Tinplate Unishell Caps have successfully cleared extensive SGS laboratory testing to meet the stringent requirements of the US and EU markets.
●US FDA 21 CFR 175.300: Passed. Confirmed zero harmful migration under simulated food and drug contact.
●REACH SVHC Compliance: Passed. Verified free from all 253 Substances of Very High Concern.
●EU RoHS Directive: Passed. Guaranteed free from Lead, Mercury, and Cadmium.
●Heavy Metal Safety: Strict batch testing ensures zero contamination in the tinplate material.
Our History: Over 30 Years of Packaging Expertise
Hangzhou Uniseel Technology Co., Ltd. is the specialized foreign-trade subsidiary of Hangzhou Lin'an Shengxiang Technology Co., Ltd. Since the 1990s, we have been a dedicated leader in the cap manufacturing industry, accumulating over thirty years of expertise in high-precision sealing solutions.
R&D Excellence and Quality Assurance
Equipped with advanced production facilities and an ISO Class 7 (Class 10,000) cleanroom, our company holds dozens of patented technologies. Our stringent quality management system is ISO9001 certified, ensuring every product meets pharmaceutical-grade requirements.
Our Corporate Slogan: Unified Quality, Sealed for Safety.
At Uniseel, we believe a cap is the final guardian of your product's integrity. Our mission is to provide global brands with reliable, aesthetically superior, and legally compliant sealing solutions that protect consumer health and elevate brand value.
Q1: Are EPE foam liners suitable for liquid products?
A1: Yes, EPE foam liners are excellent for general liquid products like shampoos, lotions, and detergents. However, for products prone to heavy oxidation or leakage under extreme pressure, we recommend our IHS (Induction) liners for a hermetic seal.
Q2: Can I reuse the EPE foam liner?
A2: Absolutely. One of the main advantages of EPE foam is its resilience. It maintains its sealing shape through hundreds of opening and closing cycles, making it perfect for multi-use products.
Q3: How do I choose between different foam thicknesses?
A3: Thickness choice depends on the cap depth and bottle rim uniformity. We offer precision-cut EPE liners in various thicknesses with a ± 0.1mm tolerance to ensure a perfect fit for our full range of Unishell caps.
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