In the highly regulated markets of pharmaceuticals, nutraceuticals, and luxury cosmetics, the integrity of the seal is paramount. The 45/400 Silver Unishell Cap by Uniseel represents the culmination of 30 years of manufacturing excellence. Our brand, Uniseel, stands for a unified approach to quality and safety, ensuring that every closure we produce meets the highest international standards. This 45mm inner diameter (I.D.) closure is specifically engineered to fit PET Jars with a GPI 45/400 neck finish, providing a sleek, straight-sided aesthetic that eliminates the visible, cluttered threads of traditional continuous-thread caps. By choosing the Unishell design, brands can achieve a premium 'apothecary' look that resonates with modern consumers who value minimalism and professional design.
Our Silver Tinplate closures are not merely decorative; they are a high-performance engineering solution. Every cap is produced through a 100% automated stamping and coating process, ensuring that the critical 45mm inner diameter remains consistent to within microns. This precision is essential for ensuring that torque application remains uniform across high-speed filling lines, preventing leaks and preserving the potency of the contents.
While the market offers plastic and aluminum alternatives, Uniseel remains dedicated to High-Grade Tinplate (TP). Tinplate is a cold-rolled steel sheet coated with a protective layer of tin, offering a unique combination of structural rigidity, superior barrier properties, and exceptional dent resistance. For 45mm wide-mouth containers, maintaining 'ovality' is a common challenge; however, tinplate's inherent strength ensures the cap remains perfectly circular, providing a consistent seal against the container's rim.
Furthermore, our tinplate is 100% recyclable, making it an ideal choice for brands looking to meet sustainability goals. The premium Silver finish is a pharmaceutical-grade protective layer that prevents oxidation and ensures the closure remains pristine from the factory to the end consumer.
Technical precision is the foundation of our manufacturing. The 45/400 designation refers to the industry-standard GPI (Glass Packaging Institute) finish, where '45' represents the nominal inner diameter in millimeters and '400' represents the specific thread profile. By strictly adhering to these standards, our caps are guaranteed to fit any container manufactured with a 45/400 neck finish.
| Technical Parameter | Detailed Specification |
| Neck Finish Standard | GPI 45/400 (45mm Inner Diameter) |
| Inner Diameter (I.D.) | 45.0mm |
| Material | Electrolytic Tinplate (ETP) |
| Color/Finish | Premium Silver (Food-Grade Protective Coating) |
| Application | Supplements, Pills, Powders, Luxury Beauty |
A closure is only as effective as its liner. Uniseel offers world-class sealing solutions that have been rigorously tested for compatibility and safety.
A. Induction Heat Seal (IHS) Liners:
For brands requiring maximum security and an airtight barrier, our IHS liners are the definitive choice. The foil layer is bonded directly to the container's rim using electromagnetic induction, creating a hermetic seal that provides clear tamper evidence and prevents oxidation. Our IHS liners are SGS-certified BPA-Free and PAA-Free.
B. PS22 Pressure Sensitive Liners:
Ideal for dry pharmaceuticals and capsules, the PS22 liner adheres to the rim through cap torque alone. It provides an efficient and reliable seal without the need for induction machinery, while still maintaining high safety standards.
Our parent company, Hangzhou Lin'an Shengxiang Technology Co., Ltd., maintains pharmaceutical-grade hygiene. Our facility features an ISO Class 7 (Class 10,000) Cleanroom, where the environment is strictly monitored for particulates and microbial load. This ensures that every 45/400 cap is delivered with virtually zero contamination, a critical requirement for global health and supplement brands.
Furthermore, our innovation is protected by multiple utility model patents (e.g., ZL 2018 2 0215930.2), and our 100% automated production lines allow us to produce 250,000 units per day with total consistency.
Exporting to international markets requires verified compliance. Our 45/400 Silver Unishell caps are fully certified by SGS for FDA 21 CFR 175.300, REACH SVHC, and RoHS standards.
Since the 1990s, our facility in Hangzhou, China, has been dedicated to the pursuit of the perfect seal. Hangzhou Uniseel Technology Co., Ltd. carries forward this legacy of manufacturing excellence. Our slogan, 'Unified Quality, Sealed for Safety,' reflects our commitment to protecting your product and your brand's reputation with every closure we manufacture.
Q1: Does the 45/400 size refer to the inner or outer diameter?
A1: In the GPI standard, 45/400 refers to the nominal Inner Diameter (I.D.) of the cap, which is precisely designed to fit a container neck with a 45mm outer diameter.
Q2: Can these caps be customized with an embossed logo?
A2: Yes, we offer 3D embossed logo customization for the 45/400 size, allowing you to add a tactile and premium branding element to the top of the cap.
Q3: Are the coatings safe for health supplements?
A3: Absolutely. All our coatings are pharmaceutical-grade and have cleared SGS food contact safety tests (FDA 21 CFR 175.300).
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