In the high-stakes world of pharmaceutical and nutraceutical retail, the packaging is the primary bridge between consumer trust and product integrity. The 45/400 Gold Unishell Cap by Uniseel represents the zenith of closure design, specifically engineered for premium glass bottles. Unlike traditional continuous-thread (CT) caps that leave unsightly threads exposed, our Unishell design features a smooth, straight-sided skirt that integrates seamlessly with the glass shoulder. This creates a monolithic, apothecary-style aesthetic that is synonymous with heritage, precision, and medical-grade quality.
Our brand, Uniseel, is dedicated to a singular vision: 'Unified Quality, Sealed for Safety.' By choosing the 45mm inner diameter (I.D.) gold Unishell closure, brands can transform standard amber or clear glass bottles into premium product lines that command attention and convey a message of uncompromising excellence.
Technical accuracy is not just a requirement; it is a core value of the Uniseel manufacturing process. The 45/400 designation refers to the industry-standard Glass Packaging Institute (GPI) finish. The '45' represents the nominal 45mm Inner Diameter (I.D.), ensuring a micron-precise mechanical fit with any glass bottle neck manufactured to 45/400 standards. Our 100% automated stamping and coating lines ensure that thread engagement is uniform, providing the optimal sealing torque required to prevent leaks and maintain product freshness over extended shelf lives.
| Technical Parameter | Detailed Specification |
| Neck Finish Standard | GPI 45/400 (45mm Inner Diameter) |
| Inner Diameter (I.D.) | 45.0mm ± 0.1mm |
| Material | High-Grade Electrolytic Tinplate (ETP) |
| Finish | Premium Gold Pharmaceutical-Grade Lacquer |
| Application | Health Supplements, Specialty Foods, Luxury Beauty |
Navigating the regulatory requirements of the US FDA, the EU's REACH health authorities requires verified safety documentation. Our 45/400 Gold Unishell closures have cleared exhaustive SGS testing, ensuring they meet the strictest international standards. We provide full support for FDA 21 CFR 175.300 (Food Contact Safety), REACH SVHC (Chemical Safety), and RoHS (Heavy Metal Restriction).
The quality of every Uniseel closure is backed by the manufacturing might of our parent company, Hangzhou Lin’an Shengxiang Technology Co., Ltd. Based in Hangzhou, China, our parent company has been at the forefront of metal closure innovation since the 1990s. Our facility features a pharmaceutical-grade ISO Class 7 (Class 10,000) Cleanroom, where particulates and microbial contaminants are strictly controlled. This environment is essential for producing closures for the health and supplement sectors. Our parent company holds the ISO 9001:2015 certification and multiple utility model patents (e.g., ZL 2018 2 0215930.2) that protect the unique structural integrity of the Unishell design.
While some manufacturers opt for aluminum, Uniseel remains committed to High-Grade Tinplate (TP). Tinplate is a cold-rolled steel sheet coated with a protective layer of tin, offering superior structural rigidity and barrier properties. For wide-mouth 45mm glass containers, maintaining 'ovality control' is paramount. Tinplate's inherent strength ensures the cap remains perfectly circular under torque, providing a more consistent and reliable seal than aluminum, which is prone to deformation. Furthermore, tinplate is 100% and infinitely recyclable, aligning your brand with global sustainability and ESG goals.
The seal is the ultimate guardian of your product's potency. Uniseel offers world-class lining options optimized for glass bottle applications:
Induction Heat Seal (IHS) Liners:
For products requiring an unbreakable, hermetic seal and clear tamper evidence, our IHS liners are the definitive choice. The foil layer is bonded directly to the glass rim via electromagnetic induction, creating a barrier against moisture and oxygen that extends shelf life and ensures consumer safety. Our IHS liners are SGS-certified BPA-Free and PAA-Free.
PS22 Pressure Sensitive Liners:
Ideal for capsules and dry pharmaceuticals, the PS22 liner provides a secure seal through mechanical torque alone. It offers a professional look and reliable protection without the need for induction machinery, while maintaining Food Contact Material (FCM) safety standards.
While our standard gold finish is a hallmark of luxury, we offer extensive customization to make your brand unique. Our high-precision 3D embossing service can add a tactile, branded logo to the top of the 45/400 cap. We also offer custom color matching (Pantone) for the gold lacquer, allowing you to fine-tune the luster and depth of the gold to perfectly match your brand's visual identity.
Q1: Does the 45/400 size refer to the inner or outer diameter?
A1: In the industry-standard GPI finish, 45/400 refers to the nominal Inner Diameter (I.D.) of the cap, which is designed to fit a glass bottle neck with a 45mm outer diameter. This ensures a precision fit and proper thread engagement.
Q2: How do you ensure the gold finish does not peel or scratch?
A2: Our gold lacquer is a pharmaceutical-grade coating that is cross-linked and cured at high temperatures. This ensures maximum adhesion to the tinplate, preventing any scratching or peeling even under high-torque automated capping machines.
Q3: Are these caps compatible with both amber and clear glass?
A3: Absolutely. As long as the glass bottle features a GPI 45/400 neck finish, our caps are guaranteed to fit perfectly. The gold finish provides an elegant contrast with all glass colors, including frosted and cobalt blue.
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