In the competitive landscape of the global nutraceutical and pharmaceutical markets, the primary goal of any packaging system is to deliver the product in its purest, most stable form. The sealing liner is the linchpin of this system. It acts as the final sentinel between the external environment and the sensitive formulations inside. For dry goods such as capsules, tablets, and powders, the liner provides a critical moisture barrier, preventing the clumping or degradation of active ingredients. At Uniseel, our 'Sealed for Protection' liners provide consumers with immediate physical evidence of safety and integrity, fostering brand trust and meeting the high standards required in the USA and European Union (EU).
A robust seal is not just about protection; it is about perceived quality. When a consumer removes the Uniseel cap and sees a clean, professionally adhered PS22 liner, they are reassured of the brand's attention to detail and commitment to safety. Our liners are engineered to maintain their adhesive integrity across varying storage conditions, ensuring that your product remains 'Sealed for Safety' from the cleanroom to the end-user.
Selecting the correct liner is a technical decision based on the container material, the product's chemical sensitivity, and the production workflow.
PS22 Liner: The Industry Standard for Dry Goods
The PS22 liner is a specific, high-performance grade of pressure-sensitive liner. It features a high-density foam base combined with a specialized torque-activated adhesive layer. It is arguably the most efficient sealing solution for professional dry goods packaging.
• Features: Unlike induction liners, PS22 requires no machinery. The seal is activated by the simple mechanical force of tightening the cap. It provides a distinct 'Sealed for Your Protection' message, which is a key requirement for retail supplements.
• Benefits: High-tack adhesion ensures the liner remains firmly bonded to the bottle rim (Glass, PET, or HDPE) until the consumer removes it.
IHS Liner (Induction Heat Seal): Hermetic Excellence
The Induction Heat Seal (IHS) liner uses electromagnetic induction to bond an aluminum foil layer to the container. It is the gold standard for liquid products and high-moisture-sensitive powders.
• Features: Requires an induction sealing machine. The foil layer provides an absolute oxygen and moisture barrier.
• Benefits: 100% tamper-evident. The foil must be punctured or peeled away to access the contents, providing maximum security.
Pressure Sensitive Liner (Standard PS): Versatile Utility
Standard Pressure Sensitive (PS) liners are the broader category to which PS22 belongs. They are foam discs with adhesive coatings that bond to the bottle rim under torque.
• Features: Machine-free application makes them ideal for small-to-medium production runs.
• Benefits: Cost-effective and provides a basic barrier against dust and environmental contaminants.
PE/EPE Foam Liner: Durable & Reusable
The Expanded Polyethylene (EPE) foam liner is the most common general-purpose seal found in cosmetics and household chemicals.
• Features: A resilient white foam disc that remains inside the cap. It creates a physical seal through compression.
• Benefits: Chemical resistant and reusable, allowing the consumer to reseal the product after each use.
At Uniseel, we recognize that the liner is in direct contact with the product, making safety our absolute priority. Our core sealing solutions, including our specialized IHS for PET and our PS22 Pressure Sensitive liners, are backed by comprehensive SGS testing reports. Our production is carried out in an ISO Class 7 Cleanroom, where particulates and microbial load are strictly controlled. This ensures that every Uniseel liner is clean, sterile, and safe for use in the most sensitive pharmaceutical and nutraceutical applications.
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: Can PS22 liners be used for liquid products?
A1: We do not recommend PS22 liners for liquid formulations. While they are excellent for dry goods, they do not provide the hermetic (airtight) bond required for liquids. For oils or aqueous solutions, we always recommend our IHS (Induction) liners.
Q2: Does the PS22 liner work on both glass and plastic bottles?
A2: Yes. One of the primary advantages of our PS22 standard is its versatile adhesive, which provides a secure bond to Glass, PET, HDPE, and PP containers, provided the rim is clean and dry.
Q3: How much torque is needed to activate the PS22 adhesive?
A3: Activation torque varies by cap diameter. Generally, a firm, hand-tightened torque is sufficient.
Q4: Are PS22 liners tamper-evident?
A4: PS22 liners provide a level of tamper-evidency because they adhere firmly to the rim. Once removed, they cannot be re-applied to look original. However, for maximum security, IHS liners are the preferred choice.
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