In the world of high-end supplement and nutraceutical branding, the visual weight of the package is a silent salesperson. The 45/400 Gold Unishell Cap by Uniseel represents a masterclass in functional elegance. Specifically engineered for large-format PET jars, this closure features the iconic 'Unishell' design—a straight-sided, seamless skirt that conceals the threads of the jar neck, creating a clean, monolithic profile. Unlike standard continuous-thread (CT) caps that look industrial and cluttered, the Unishell lid provides an 'apothecary' or high-luxury look that resonates with consumers who value purity and premium quality.
The deep gold finish is achieved through a pharmaceutical-grade coating process, providing a rich, metallic luster that perfectly complements amber, orange, and clear PET jars. This combination transforms standard plastic packaging into a high-perceived-value container that protects your brand's integrity and enhances shelf presence.
Uniseel maintains a philosophy of technical rigor. The 45/400 designation refers to the industry-standard GPI (Glass Packaging Institute) neck finish adapted for plastic. The '45' represents the nominal 45mm Inner Diameter (I.D.) of the cap, ensuring a perfect mechanical fit with any PET jar manufactured with a 45/400 neck finish. Our 100% automated stamping process ensures a tolerance of ± 0.1mm, which is critical for consistent torque performance on high-speed filling lines.
| Technical Parameter | Detailed Specification |
| Neck Finish Standard | GPI 45/400 (45mm Inner Diameter) |
| Inner Diameter (I.D.) | 45.0mm ± 0.1mm |
| Material | Electrolytic Tinplate (ETP) |
| Finish | Premium Gold Pharmaceutical-Grade Lacquer |
| Cleanroom Class | ISO Class 7 (Class 10,000) |
Exporting health products to the USA, EU, and Latin America requires more than just a good product; it requires a fortress of verified documentation. Our 45/400 Gold Unishell closures have cleared comprehensive SGS testing, ensuring they meet the strictest global safety regulations. We provide full documentation for FDA 21 CFR 175.300 (Food Contact Safety), REACH SVHC (Chemical Safety), and RoHS (Heavy Metal Restriction).
The quality of Uniseel is backed by the technical foundation of our parent company, Hangzhou Lin’an Shengxiang Technology Co., Ltd. Since the 1990s, our facility in Hangzhou, China, has been a hub for precision metal stamping and coating. Our parent company holds the ISO 9001:2015 certification and multiple utility model patents for our unique Unishell structural design (e.g., ZL 2018 2 0215930.2). This legacy of manufacturing expertise allows us to produce 250,000 units per day with a zero-defect target, ensuring that your large-scale global orders are fulfilled with total consistency.
A closure's primary job is to protect the contents. Uniseel offers two primary lining solutions optimized for 45mm wide-mouth PET containers:
Induction Heat Seal (IHS) Liners:
For brands requiring a hermetic, airtight seal and visible tamper evidence, our IHS liners are the definitive choice. The foil layer bonds directly to the PET rim via electromagnetic induction, creating a barrier against moisture and oxygen. Our IHS liners are SGS-certified BPA-Free and PAA-Free.
PS22 Pressure Sensitive Liners:
Ideal for dry pharmaceuticals and health capsules, the PS22 liner adheres to the jar rim through mechanical torque. It provides a clean, professional seal that is easy for consumers to use while maintaining product freshness and integrity.
While our gold finish is a standard of excellence, 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, creating a premium sensory experience for the consumer. We also provide Pantone matching for the gold lacquer, allowing you to fine-tune the shade to match your brand's specific visual guidelines.
Hangzhou Uniseel Technology Co., Ltd. is dedicated to a single operational directive: 'Unified Quality, Sealed for Safety.' We combine decades of technical heritage with modern automated innovation to protect your product and your brand's reputation. We understand that our cap is the final guardian of your product's purity, and we treat that responsibility with the utmost care and precision.
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 designed to fit a jar neck with a 45mm outer diameter. This ensures a precision fit and proper thread engagement.
Q2: How do you prevent the gold coating from scratching during capping?
A2: Our gold finish is a pharmaceutical-grade protective lacquer that is cured at high temperatures for maximum adhesion. It is engineered to resist scratching even on high-torque automated capping machinery.
Q3: Is Tinplate better than Aluminum for large 45mm jars?
A3: Yes. Tinplate offers superior structural rigidity. For 45mm wide-mouth containers, tinplate maintains its circular shape ('ovality control') much better than aluminum, ensuring a more consistent seal.
Q4: Are these caps compatible with both amber and frosted PET?
A4: Absolutely. As long as the PET jar features a GPI 45/400 neck finish, our caps are guaranteed to fit perfectly. The gold finish provides an excellent aesthetic contrast with both amber and frosted containers.
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