Explore our core engineering product portfolio including high-barrier 307 easy-open ends, SOT beverage lids, and specialized food-grade packaging components engineered for automated seamers.
In the modern rigid metal packaging ecosystem, the 307 Easy Open End (EOE)—measuring a nominal shell diameter of 83.3 mm—occupies a critical sector across food, dairy, nutritional powder, and industrial product lines. Engineering a 307 EOE requires balancing structural rigidity under pressure against effortless consumer accessibility. At Shanghai Friend Metals Technology Co., Ltd., our manufacturing protocols operate strictly within microscopic tolerances to eliminate scoreline failure while guaranteeing airtight shelf stability.
The selection of substrates for 307 Easy Open Ends depends directly on the internal fill characteristics, process conditions (such as thermal retort, hot-fill, or ambient gas flushing), and targeted shelf life. Below is an engineering comparison of the core alloys utilized in our Shanghai manufacturing facility:
| Material Substrate | Alloy & Temper Specification | Nominal Gauge Thickness | Tensile Strength (MPa) | Primary Industrial Application |
|---|---|---|---|---|
| Magnesium Aluminum Shell | AA 5182 - H48 | 0.21 mm - 0.24 mm | 360 - 410 MPa | High-pressure retort foods, meat, fish, acid fruit cans |
| Lacquered Aluminum Coil | AA 8011 / AA 3104 | 0.22 mm - 0.26 mm | 180 - 240 MPa | Dry milk powders, protein powders, coffee, dry nuts |
| Electrolytic Tinplate (ETP) | MR Temper 4 / TH610 | 0.20 mm - 0.23 mm | 450 - 520 MPa | Aerosol, processed vegetables, high-vacuum canned food |
For high-performance applications, Aluminum 5182-H48 is the industry benchmark for easy-open end shells due to its superior yield strength and exceptional workability during the conversion process. The tab stock is typically produced from AA 5052-H38, ensuring maximum leverage without tab bending or premature separation during pull initiation.
The global demand for 307 easy open end closures is accelerating rapidly, driven by the global transition away from single-use plastics and non-recyclable flexible laminates toward 100% infinitely recyclable metal packaging. According to recent market analysis, the global easy-open lid market is projected to expand at a CAGR of 5.8% through 2030, with the 83.3mm (307#) format accounting for a substantial volume in human food and premium pet nutrition segments.
307# EOE provides zero oxygen transmission rates (OTR) and zero water vapor transmission rates (WVTR), safeguarding infant formula and protein isolates against oxidation.
Formulated with high-temperature retort lacquers (epoxy phenolic or organosol) that withstand 121°C–131°C sterilization cycles without blistering or delamination.
Supports nitrogen flushing up to 1.5 bar positive pressure, allowing roasted coffee beans to degas safely while locking in volatile aromatic esters.
As a leading Chinese supplier established in Shanghai since 2010, Shanghai Friend Metals Technology Co., Ltd. leverages the unparalleled industrial ecosystem of the Yangtze River Delta. By unifying coil lacquering, high-speed conversion press stamping, and automated inline quality assurance under one rigorous framework, we deliver substantial total cost of ownership (TCO) benefits to international packaging distributors and canning factories.
Our multi-lane high-speed presses operate at up to 1,200 ends per minute per line, incorporating real-time sensor monitoring for rivet formation and scoreline depth.
Direct strategic alliances with top-tier aluminum rolling mills allow us to secure premium 3104 and 5182 coil stock with strict gauge tolerances (±0.002 mm), minimizing material surcharge volatility.
Situated near Yangshan Port and Waigaoqiao Port, we achieve expedited sea freight container dispatch, lowering inland transit lead times by up to 5 business days.
The metal packaging sector is undergoing a rapid technological evolution driven by down-gauging imperative, digital laser traceabilities, and non-BPA internal coatings. Shanghai Friend Metals' R&D roadmap for 307 Easy Open End factory production focuses on four key technological vectors:
A. Advanced Lightweighting & Rim Profile Optimization: By redesigning the countersink radius and anti-peel score contour, our engineering team has successfully reduced standard 307 shell thickness from 0.24mm to 0.21mm while preserving a minimum internal buckle strength of 6.2 bar (90 psi). This lightweighting initiative yields a 12.5% reduction in raw metal footprint per million ends shipped.
B. Next-Generation BPA-NI Coating Systems: Compliance with European Commission Regulation (EU) 2024/2466 and US FDA mandates requires absolute elimination of Bisphenol-A. We have qualified third-generation BPA-NI (Bisphenol A Non-Intent) Acrylic and Polyester resins, as well as high-performance Organosol formulations for sulfur-rich retort products (such as tuna and pet food protein).
C. Inline Vision Systems & Digital Quality Inspection: Every high-speed conversion line is outfitted with 360° high-resolution optical inspection cameras. These sensors conduct real-time evaluations of scoreline micro-cracks, compound gasket placement, tab orientation, and enamel rater values (< 2.0 mA under 6.3V test conditions).
The 307 EOE is deployed across diverse operating environments. Ensuring seamless compatibility between our ends and your filling factory's double-seaming equipment (e.g., Angelus, Ferrum, FMC, Somme) is fundamental to eliminating operational downtime.
Applied to 307 3-piece welded tinplate or drawn aluminum cans containing fish, pork, or beans. Exposed to 121°C steam for 45 minutes. Our end features a compound gasket engineered to resist steam penetration and preventing seam pressure drops.
Paired with composite paper cans or aluminum bodies. Nitrogen gas injection creates an oxygen level below 0.5%. Our 307 powder lids incorporate smooth edge safety folds to prevent consumer injury upon peel back.
Exported to humid environments in Southeast Asia, West Africa, and South America. External curl surfaces are treated with corrosion-resistant clear varnishes passivated against salt spray rust.
Shanghai Friend Metals Technology Co., Ltd. operates under rigorous quality management frameworks certified to ISO 9001:2015 and FSSC 22000 food safety standards. Every production batch of 307 Easy Open Ends is delivered with a complete Certificate of Analysis (CoA) confirming the following parameters:
Frequently asked technical questions regarding 307# EOE specifications, double-seam matching, MOQ requirements, and international ocean logistics.
In standard industry nomenclature, "307" denotes a nominal diameter of 3 and 7/16 inches, which translates to exactly 83.3 mm. This lid size fits standard 307 diameter composite, aluminum, and tinplate cans.
Our engineered 307 aluminum ends feature a pop force (initial tab lifting) of 12 N to 18 N and a pull-to-open force (score tearing) under 25 N, ensuring easy manual opening for senior consumers while resisting transit shock.
Yes. Our ends are manufactured to ISO and SEAFLEX standard curl dimensions. We provide seaming chuck and roll dimension drawings to match your automated seamers (Angelus, Ferrum, Somme, FMC, etc.).
For standard stocked 307# easy open ends, our trial order MOQ starts from 200,000 pieces. Custom lacquer orders or specialized tab colors ship within 20 to 25 working days from Shanghai Port.
Ends are stacked in polyethylene sleeves, sealed inside heavy-duty corrugated cartons or fiber drums with silica gel desiccants, and packed onto wooden pallets with full stretch-wrap hooding.
Absolutely. Every export shipment includes full chemical migration documentation and official BPA-NI compliance declarations adhering to EU 1935/2004 and US FDA 21 CFR 175.300 requirements.
Explore our companion product lines including 3104 aluminum body coil, 307 tinplate lids, sleek 330ml beverage cans, and anti-static technical powder closures.
