In the luxury skincare and professional nutraceutical industries, the closure is the critical bridge between product integrity and brand perception. The Uniseel 58/400 Unishell Cap series is specifically engineered for large-format 58mm wide-mouth jars. Our signature Unishell design features a smooth, straight-sided skirt that eliminates the cluttered, visible threads of traditional continuous-thread (CT) caps. This creates a monolithic 'apothecary' silhouette that is highly coveted by premium brands in the USA and European Union (EU).
Available in Silver, Gold, and Matte Black, our 58/400 closures provide a sophisticated metallic finish that complements frosted, amber, and cobalt blue glass. The Uniseel brand is built on the philosophy of 'Unified Quality, Sealed for Safety,' providing global partners with a protective solution that harmonizes visual elegance with technical reliability.
Technical accuracy is the foundation of the Uniseel manufacturing process. The 58/400 designation refers to the industry-standard GPI (Glass Packaging Institute) finish, where '58' represents the nominal 58mm Inner Diameter (I.D.) of the cap. Adhering to this standard ensures a perfect mechanical fit for any container manufactured with a corresponding 58/400 neck finish. Our 100% automated stamping lines maintain a micron-precise tolerance of ± 0.1mm, ensuring consistent sealing torque and hermetic integrity across every batch.
| Technical Parameter | Detailed Specification |
| Neck Finish Standard | GPI 58/400 (58mm Inner Diameter) |
| Inner Diameter (I.D.) | 58.0mm ± 0.1mm |
| Material | High-Grade Electrolytic Tinplate (ETP) |
| Color Availability | Silver, Gold, Black (Pharmaceutical-Grade Coatings) |
| Material Advantage | Superior Ovality Control over Aluminum |
Exporting to North American and European markets requires rigorous material validation. Our 58/400 closures have cleared comprehensive SGS testing, ensuring full compliance with FDA 21 CFR 175.300 (Food Contact Safety), REACH SVHC (chemical safety), and RoHS (heavy metal restrictions).
The quality of every Uniseel closure is backed by the thirty-year manufacturing expertise of our parent company, Hangzhou Lin’an Shengxiang Technology Co., Ltd. Based in Hangzhou, China, our parent company has been a pioneer in metal closure innovation since the 1990s. We operate a pharmaceutical-grade ISO Class 7 (Class 10,000) Cleanroom, where particulates and microbial load are strictly filtered to 99.9%. This environment is critical for producing closures used in the health, cosmetic, and pharmaceutical sectors. Our facility holds the ISO 9001:2015 certification and multiple utility model patents (e.g., ZL 2018 2 0215930.2) that protect the structural superiority of our Unishell design.
For wide-mouth 58mm jars, material selection is a technical decision with significant consequences for product shelf-life. Uniseel exclusively promotes Tinplate (TP) over aluminum for large-format closures. Tinplate, a cold-rolled steel sheet coated with a protective layer of tin, offers far superior structural rigidity. While aluminum is prone to 'ovality' (deforming from a perfect circle), tinplate maintains its circular shape during automated capping and global transit, ensuring a consistent hermetic seal. Furthermore, tinplate is 100% and infinitely recyclable, aligning with the ESG (Environmental, Social, and Governance) targets of modern global brands.
A premium closure is only as good as its seal. Uniseel offers world-class lining options optimized for 58mm wide-mouth applications:
Induction Heat Seal (IHS) Liners:
For products requiring an airtight, hermetic seal and clear tamper evidence, our IHS liners bond directly to the container rim via electromagnetic induction. This creates a high-performance barrier against moisture and oxygen, preserving the efficacy of your active ingredients.
PS22 Pressure Sensitive Liners:
Ideal for dry health capsules and pharmaceuticals, the PS22 liner provides a secure seal through mechanical torque alone, offering a professional presentation without the need for induction equipment.
Sustainability and hygiene are the dual pillars of the Uniseel philosophy. Our ISO Class 7 cleanroom production ensures that our 58/400 caps arrive with zero contamination. Combined with the 100% recyclability of tinplate, Uniseel provides a 'green' and safe packaging solution that meets the most stringent environmental demands of consumers in the USA and Europe.
To further distinguish your brand, Uniseel offers high-precision 3D embossed logo services for the 58/400 series. A tactile, embossed logo on the cap surface adds a level of sophistication and premium branding that printed designs cannot match, while also serving as an anti-counterfeiting measure.
Q1: Does the 58/400 size refer to the inner or outer diameter?
A1: In the industry-standard GPI finish, 58/400 refers to the nominal Inner Diameter (I.D.) of the cap, which is 58.0mm ± 0.1mm. It is designed to fit jars with a 58mm outer diameter neck finish.
Q2: Is Tinplate better than Aluminum for 58mm wide-mouth cosmetic jars?
A2: Yes. For wide-mouth 58mm caps, tinplate offers superior 'ovality control,' maintaining its shape during shipping and automated capping better than softer aluminum.
Q3: Are the Gold and Silver finishes safe for direct food or supplement contact?
A3: Absolutely. Our Gold and Silver 58/400 caps feature full-unit SGS reports confirming compliance with FDA and REACH standards for direct contact safety.
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