In the world of bulk-format nutraceuticals, large-scale skincare, and professional-grade pharmaceuticals, the closure must be more than a simple seal; it must be an anchor of brand authority and product safety. The Uniseel 70/400 and 89/400 Unishell Cap series represent the ultimate engineering solution for wide-mouth containers. Our signature Unishell design features a smooth, straight-sided skirt that eliminates the visible, cluttered threads of traditional continuous-thread (CT) caps. This creates a massive, monolithic 'apothecary' look that is highly valued by premium brands in the USA and European markets looking to command shelf presence.
Crafted from high-grade Electrolytic Tinplate (ETP), these large-format closures provide the structural integrity required for 70mm and 89mm neck finishes. Uniseel is committed to 'Unified Quality, Sealed for Safety,' ensuring that even at the largest diameters, your product remains protected by three decades of manufacturing mastery.
Technical precision at high diameters is the ultimate test of a manufacturer's capability. The 70/400 and 89/400 designations refer to the industry-standard GPI (Glass Packaging Institute) finishes. For Uniseel, '70' and '89' represent the nominal Inner Diameter (I.D.) of the caps (70.0mm and 89.0mm respectively).
| Technical Parameter | 70/400 Specification | 89/400 Specification |
| Neck Finish Standard | GPI 70/400 | GPI 89/400 |
| Inner Diameter (I.D.) | 70.0mm ± 0.1mm | 89.0mm ± 0.1mm |
| Material | Electrolytic Tinplate (ETP) | Electrolytic Tinplate (ETP) |
| Available Finishes | Silver, Gold, Matte Black | Silver, Gold, Matte Black |
Large-format health and beauty products exported to the USA and European Union require verified material safety. Our 70/400 and 89/400 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 manufacturing expertise 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. We operate a pharmaceutical-grade ISO Class 7 (Class 10,000) Cleanroom, where particulates and microbial load are filtered to 99.9%. This environment is essential for producing closures used in large-capacity health, cosmetic, and supplement packaging. Our facility holds the ISO 9001:2015 certification and multiple technical patents (e.g., ZL 2018 2 0215930.2) that ensure the structural superiority of our large-format Unishell design.
At large diameters like 70mm and 89mm, material selection is a technical decision with extreme consequences. Uniseel exclusively promotes Tinplate (TP) over aluminum for bulk closures. Aluminum is a soft metal that is highly prone to 'ovality' (deforming into an ellipse) at large diameters, which can lead to catastrophic leaks and capping failures. Tinplate, a cold-rolled steel coated with tin, provides the inherent rigidity necessary to maintain a perfect circle under pressure. This ensures a consistent, hermetic seal during high-speed automated capping and long-haul shipping. Furthermore, tinplate is 100% and infinitely recyclable, supporting the ESG (Environmental, Social, and Governance) targets of modern global brands.
A closure's primary role is protection. Uniseel offers world-class lining options optimized for 70mm and 89mm applications:
Induction Heat Seal (IHS) Liners:
Crucial for bulk containers requiring a hermetic seal and clear tamper evidence. The liner bonds to the container rim via electromagnetic induction, creating an high-performance moisture and oxygen barrier essential for large volumes of active supplements or professional-grade creams.
PS22 Pressure Sensitive Liners:
Ideal for large-format dry pharmaceuticals and capsules, providing a secure seal through mechanical torque alone, offering a professional presentation without the need for specialized induction machinery.
Hygiene and sustainability are the dual pillars of the Uniseel philosophy. By manufacturing in an ISO Class 7 cleanroom and using infinitely recyclable tinplate, we provide a packaging solution that is both sterile and eco-friendly. This helps our partners in the USA and Europe meet their sustainability targets while ensuring the highest level of product purity for large-scale packaging formats.
To further solidify your brand's market position, Uniseel offers high-precision 3D embossed logo services for the 70/400 and 89/400 series. A tactile, embossed logo on the cap's surface adds a level of sophistication and premium branding that printed designs cannot match, while also serving as a subtle but effective anti-counterfeiting measure for high-value bulk products.
Q1: Does the 89/400 size refer to the inner or outer diameter?
A1: In the industry-standard GPI finish, 89/400 refers to the nominal Inner Diameter (I.D.) of the cap, which is 89.0mm ± 0.1mm. It is designed to fit large-format jars with an 89mm outer diameter neck finish.
Q2: Is Tinplate better than Aluminum for 70mm and 89mm supplement jars?
A2: Yes. At these larger diameters, aluminum is prone to 'ovality' and deformation. Tinplate provides the structural rigidity necessary to maintain a perfect circular seal, ensuring product safety during global transit.
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