The Uniseel 38/400 Gold Unishell Cap (also known as Unishell closure or Unishell lid) is the premium choice for brands using amber, clear, or frosted glass bottles. Glass packaging signifies purity and high-end positioning, and our luxury gold tinplate finish perfectly complements this aesthetic. The straight-sided, seamless design of the Unishell closure hides the bottle's neck threads, providing a sleek, unified silhouette that glass containers deserve.
Manufactured using 100% automated precision stamping, our gold unishell lids ensure a perfect airtight seal on glass neck finishes. The superior structural integrity of tinplate provides a more durable and premium feel than standard aluminum, making it ideal for pharmaceutical, nutraceutical, and boutique cosmetic glass packaging.
Engineered to fit standard GPI glass neck finishes with high-precision tolerance control.
| Parameter | Specification Detail |
| Neck Finish Standard | GPI 38/400 (Glass) |
| Inner Diameter | 38.0mm |
| Material | Premium Recyclable Tinplate (TP) |
| Surface Finish | High-Gloss Gold Coating (FDA Approved) |
| Compatibility | Amber, Clear, Frosted, and Cobalt Glass Bottles |
At Uniseel, we understand that glass bottle users demand the highest levels of chemical inertness. Our gold unishell caps are rigorously tested by SGS to ensure zero contamination.
●FDA 21 CFR 175.300: Passed. Certified safe for contact with food, vitamins, and medicine.
●REACH SVHC: Passed. Verified free from all 253 substances of very high concern.
●RoHS Directive: Passed. No lead, mercury, or other hazardous heavy metals.
Our manufacturing strength is backed by official global certifications and a robust portfolio of intellectual property, ensuring that every closure is the result of advanced engineering.
A. Quality Management Certification
●ISO 9001:2015 Certified: Our factory, Hangzhou Lin'an Shengxiang Technology Co., Ltd., holds a valid ISO 9001:2015 certification for the production of metal bottle caps, ensuring consistent quality and full traceability.
B. Proprietary Technology & Patents
Uniseel invests heavily in R&D, holding numerous utility model patents that differentiate our sealing solutions from standard market alternatives:
●New Structural Metal Cap (ZL 2018 2 0215930.2): Enhanced integrity for high-pressure sealing environments.
●Tin-Aluminum Combination Closure (ZL 2018 2 0222948.5): Innovative material blending for specialized barrier requirements.
●Easy-Open Sealing Technology (ZL 2023 2 3383081.1): Optimized ergonomics for end-user accessibility without compromising airtightness.
●Advanced Manufacturing Equipment: Proprietary patents in cap processing, curling pretreatment, and stamping molds (ZL 2023 2 3141660.5, ZL 2023 2 3056963.7, ZL 2023 2 3216593.9, ZL 2023 2 3287198.X).
We provide high-performance liners optimized for glass-to-metal sealing interfaces.
A. Induction Heat Seal (IHS) Liner for Glass
Creates an unbreakable, airtight bond to the glass rim for maximum shelf-life and tamper evidence.
●Passed BPA-Free and PAA-Free SGS Testing.
B. PS22 Pressure Sensitive Liner
Provides a secure seal for dry contents like pills and capsules without needing specialized equipment.
●Passed Organoleptic (Sensory) and Migration Tests.
Our production facility is equipped with an ISO Class 7 Cleanroom, ensuring every gold unishell closure is pharmaceutical-grade clean.
●Capacity: 250,000 units per day.
●Cleanroom Level: ISO Class 7 (Class 10,000) for highest hygiene standards.
Make your glass bottle standout with a 3D Embossed Logo on the gold lid. This premium branding service adds a high-end tactile feel that reinforces brand authority.
Our History: Over 30 Years of Packaging Expertise
Hangzhou Uniseel Technology Co., Ltd. is the specialized foreign-trade subsidiary of Hangzhou Lin'an Shengxiang Technology Co., Ltd. With over thirty years of deep-rooted expertise in cap manufacturing since the 1990s, we have established ourselves as a trusted global leader in precision sealing solutions.
R&D Excellence and Quality Assurance
Equipped with advanced production facilities and an ISO Class 7 (Class 10,000) cleanroom, we hold dozens of patented technologies. Our ISO9001 certified quality management system ensures every product meets pharmaceutical-grade standards.
Our Corporate Slogan: Unified Quality, Sealed for Safety.
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: Does the gold coating on the unishell lid scratch easily?
A1: Our gold coating is protected by a pharmaceutical-grade topcoat that is highly resistant to abrasion and scratching during capping and transport.
Q2: Are your patents recognized internationally?
A2: Our patents are issued by the CNIPA (China National Intellectual Property Administration) and represent our core technical innovations in cap structure and manufacturing. These proprietary technologies ensure that Uniseel products offer superior performance that 'generic' caps cannot match.
Q3: What is the benefit of a Unishell lid over a standard continuous thread cap?
A3: The Unishell lid provides a much cleaner 'straight-wall' look. By hiding the threads, it creates a more premium, minimalist aesthetic that is highly favored in the beauty and health industries.
Q4: How do you prevent the caps from rusting?
A4: Our tinplate is double-coated with a protective varnish that prevents oxidation, ensuring the gold finish remains pristine throughout the product's lifecycle.
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