In the global packaging market, consistency across product lines is the hallmark of brand authority. The Uniseel Unishell Cap Full Range—spanning from 38mm to 89mm—offers a comprehensive closing solution for the most demanding pharmaceutical, nutraceutical, and cosmetic brands. Our Unishell design is a masterclass in minimalist engineering, featuring a smooth, straight-sided skirt that completely conceals the jar threads. This creates the 'apothecary' silhouette that has become the standard for high-end products in the USA and European markets.
Whether you are packaging delicate eye creams in 38mm jars or bulk health supplements in 89mm containers, Uniseel ensures a unified aesthetic and technical performance. Our brand is built on the core promise of 'Unified Quality, Sealed for Safety,' providing a seamless transition between different product sizes while maintaining the highest manufacturing standards in the industry.
Uniseel maintains a rigorous technical protocol across its entire manufacturing catalog. All model numbers refer to the nominal Inner Diameter (I.D.) of the cap, ensuring a perfect mechanical fit with industry-standard GPI glass and PET neck finishes. We employ a strict manufacturing tolerance of ± 0.1mm for every diameter, from our smallest 38/400 to our largest 89/400 closure.
| Model / Size | Inner Diameter (I.D.) | Standard Applications |
| 38/400 | 38.0mm ± 0.1mm | Eye Creams, Essential Oils, Tinctures |
| 45/400 | 45.0mm ± 0.1mm | Standard Vitamins, Serums, Balms |
| 53/400 | 53.0mm ± 0.1mm | Capsule Jars, Apothecary Bottles |
| 58/400 | 58.0mm ± 0.1mm | Premium Face Creams, Hair Masks |
| 70/400 | 70.0mm ± 0.1mm | Large Supplements, Organic Skincare |
| 89/400 | 89.0mm ± 0.1mm | Bulk Powders, Industrial-Size Jars |
At Uniseel, we prioritize Electrolytic Tinplate (ETP) as the primary material for our Unishell closures. For wide-mouth applications, particularly those above 53mm, tinplate offers significantly better structural rigidity than aluminum. This superior 'ovality control' ensures that the cap maintains its perfect circular shape during automated high-speed capping and the extreme stresses of global shipping. By choosing tinplate, brands eliminate the risk of the 'elliptical deformation' that leads to seal failure in softer materials. Additionally, tinplate is 100% and infinitely recyclable, supporting the ESG targets of eco-conscious consumers in the EU and USA.
The reliability of the Uniseel range is backed by thirty years of manufacturing excellence from our parent company, Hangzhou Lin’an Shengxiang Technology Co., Ltd. Our facility in Hangzhou is home to an ISO Class 7 (Class 10,000) Cleanroom, where particulates and microbial contaminants are filtered to 99.9%. This pharmaceutical-grade environment is a critical prerequisite for closures intended for the health and wellness sector. Our parent company holds the ISO 9001:2015 certification and multiple utility model patents (e.g., ZL 2018 2 0215930.2), ensuring that every Unishell cap is a product of verified innovation and heritage.
Uniseel provides clear, verifiable compliance data for all international shipments:
Silver & Gold Caps:
Our standard Silver and Gold finishes are cleared as full-unit SGS reports, confirming compliance with FDA 21 CFR 175.300, REACH SVHC, and RoHS. These are ready for immediate deployment in highly regulated markets.
Custom Color Caps:
For bespoke branding, we offer Pantone matching for custom colors. These closures utilize our SGS-certified IHS and PS22 liners and safety-tested base tinplate, ensuring the highest level of material safety even for unique brand aesthetics.
A closure's integrity is defined by its seal. Uniseel offers two primary lining technologies optimized for our full range:
Induction Heat Seal (IHS) Liners:
Provides a hermetic, airtight seal and tamper evidence. Ideal for liquids and products requiring maximum shelf-life protection. Our IHS liners are SGS-certified BPA-free.
PS22 Pressure Sensitive Liners:
A cost-effective, high-performance solution for dry supplements and capsules. It seals via mechanical torque alone, providing a professional presentation without specialized machinery.
Metal is the most recycled packaging material in the world. By choosing Uniseel's tinplate closures over plastic alternatives, brands can significantly reduce their environmental footprint. Our metal lids are 100% and infinitely recyclable, aligning your brand with the circular economy goals of modern American and European markets.
Across our entire size range, Uniseel offers high-precision 3D embossing services. Adding a tactile, branded logo to the top of the cap not only elevates the luxury feel of the packaging but also serves as a sophisticated anti-counterfeiting measure, protecting your brand's integrity on the global stage.
Q1: Does the model number (e.g., 53/400) refer to the inner or outer diameter?
A1: Per industry standards, the first number refers to the nominal Inner Diameter (I.D.) of the cap. For Uniseel, a 53/400 cap has an I.D. of exactly 53.0mm ± 0.1mm.
Q2: Why is tinplate preferred for large diameters like 70mm and 89mm?
A2: Large-diameter caps require high structural rigidity to prevent 'ovality' and maintain a hermetic seal. Tinplate is significantly stronger than aluminum, ensuring zero leakage for bulk containers.
Q3: Are these caps compatible with both PET jars and glass bottles?
A3: Absolutely. As long as the container features a GPI-standard neck finish corresponding to the cap size, our Unishell closures are guaranteed to fit perfectly.
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