Explore our high-performance precision easy-open ends, powder lids, and aluminum beverage containers manufactured under strict ISO 9001 and FSSC 22000 quality standards.
Understanding the dimensional tolerance, scoring mechanics, and metallurgical requirements of the industry-standard 83.3mm (307 diameter) container closure.
The 307# Easy Open End (EOE) features a nominal outer diameter of 83.3mm. Achieving perfect pull-tab function without micro-leaks requires score-residual depth control within ±0.002mm. Scoring residual typically ranges from 0.055mm to 0.065mm depending on whether Prime Tinplate (ETP), TFS (ECCS), or 5182-H48 Aluminum alloy is specified.
Our engineered 307# full-aperture and ring-pull ends maintain an ultra-low Pop Force (<22 N) and a smooth Tear/Pull Force (<48 N). This ergonomics profile guarantees effortless consumer opening while resisting internal pressure spikes up to 2.5 bar during high-temperature thermal retort sterilization (up to 131°C).
Coating integrity is crucial. We apply specialized BPA-NI (BPA Non-Intent), Organosol, or Epoxy-Phenolic internal gold/clear lacquers. Every 307 lid undergoes strict Enamel Rater testing (<0.5 mA leakage) to eliminate metal exposure, prevent sulfur staining in fish/pet food, and ensure zero flavor migration.
| Parameter Metric | Tinplate (ETP) 307# EOE | Tin-Free Steel (TFS/ECCS) 307# | Aluminum 5182-H48 307# |
|---|---|---|---|
| Nominal Diameter | 83.3 mm (307#) | 83.3 mm (307#) | 83.3 mm (307#) |
| Material Gauge (Thickness) | 0.21 mm – 0.23 mm | 0.21 mm – 0.22 mm | 0.24 mm – 0.26 mm |
| Temper Class | TH330 / T3 CA / DR8 | TH330 / DR8 | H48 High Tensile |
| Internal Coating Types | Epoxy Phenolic / Organosol / BPA-NI | Organosol / BPA-NI Clear/Gold | BPA-NI / Modified Vinyl |
| Sterilization (Retort Tolerance) | 121°C – 131°C (30-90 Mins) | 121°C – 131°C (30-90 Mins) | Up to 121°C |
| Primary Application | Canned Tuna, Meat, Fruits, Vegetables | Pet Food, Processed Seafood | Powders, Dry Foods, Nuts |
Analyzing global demand drivers, trade volume growth, and the strategic adoption of 83.3mm metal closures across key food production sectors.
The global metal packaging market continues to experience robust growth, driven by expanding urban populations, rising demand for shelf-stable convenience foods, and stricter global regulations targeting single-use plastics. Within the rigid metal container sector, the 307 Easy Open End (83.3mm) occupies a dominant position. It serves as the primary closure specification for mid-sized round cans widely used in human food, wet pet food, and industrial powders.
According to recent market intelligence, the global easy open end market is projected to expand at a CAGR of 4.8% through 2030, with the 307# size accounting for over 22% of total volume in the food eoe category. Key growth vectors include:
Premiumization in pet nutrition has fueled an explosion in 307x109, 307x111, and 307x201 can formats. Pet owners demand easy-pull, full-aperture ring-pull lids that eliminate the need for traditional can openers while preventing sharp edge hazards.
Coastal food processors in Southeast Asia, Latin America, and Southern Europe require millions of anti-corrosive 307# tinplate and TFS ends monthly for tuna, salmon, and mackerel, requiring heavy-duty organosol coatings to resist salt air and marine acids.
Aluminum 307# easy open ends paired with plastic over-caps have become the benchmark for infant formula, protein powders, and specialty coffee beans, offering a 100% airtight barrier against oxygen ingress and moisture degradation.
Why leading global food conglomerates choose Shanghai Friend Metals as their strategic manufacturing partner for high-speed seaming lines.
Operating out of Shanghai's industrial heartland, Shanghai Friend Metals Technology Co., Ltd. combines modern high-speed stamping automation with fully integrated raw material sourcing. China's complete industrial ecosystem for tinplate, aluminum coil, and specialized chemical coatings provides unparalleled efficiency benefits for international buyers:
Our production facilities integrate multi-cavity conversion presses operating at up to 1,200 ends per minute. State-of-the-art tooling guarantees absolute dimensional uniformity, ensuring seamless feeding on automatic high-speed closing seamers like Ferrum, Angelus, and FMC.
Every single 307# easy open end passes through automated 100% camera visual systems that inspect tab placement, score line integrity, curling profile, and compound lining weight. Defective ends are automatically rejected prior to packaging.
Direct proximity to Shanghai Port enables rapid container stuffing and vessel departure. Ends are packed in heavy-duty polyethylene sleeves, moisture-proof kraft wraps, and reinforced corrugated outer boxes mounted on ISPM-15 compliant heat-treated pallets.
Tailoring lacquer chemistry, compound lining, and metal temper to match specific filling environments and shelf-life demands.
Seafood processing creates high sulfur loads during retort. We supply 307# EOE with specialized organosol linings containing zinc oxide additives to bind sulfur molecules, preventing black sulfide staining on the metal surface and keeping food visually pristine.
Pet foods frequently combine high fat contents with acidic gravy. Our double-coated BPA-NI ends resist aggressive fatty acids and preserve hermetic seals under severe thermal pressure cycling inside steam retort cookers.
For non-retort dry products, full-aperture aluminum 307# ends offer smooth-tear foil or aluminum membranes. Pairable with plastic overcaps, they provide superior gas-flushing retention (nitrogen packing) and long shelf life.
Comprehensive testing protocols applied to every batch before release to international ocean freight.
When sourcing 307 Easy Open Ends internationally, procurement teams must evaluate key technical metrics to ensure seam integrity and avoid costly filling line downtime. At Shanghai Friend Metals, every lot is accompanied by a mill certificate and inspection report covering:
Next-generation metallurgical developments driving environmental compliance and operational cost reduction.
Advanced high-tensile temper steels (DR8 temper) allow gauge reduction from 0.23mm down to 0.20mm without compromising buckle resistance, directly reducing raw material consumption and freight carbon footprint.
Global food safety standards (EU, US FDA) are phasing out legacy bisphenol-A lacquers. Our R&D team offers non-intent acrylic and polyester lining systems tested for extended 3-year shelf-life stability.
Custom laser-engraved QR codes and brand logos directly on the pull tab enhance brand protection, consumer engagement, and batch traceability across global retail markets.
Technical answers provided by our packaging engineering team for B2B buyers and quality directors.
Explore our full ecosystem of high-speed beverage ends, tinplate closures, and standard cans.
Since 2010, Shanghai Friend Metals Technology Co., Ltd. has served as a global leader in food-grade metal packaging manufacturing. Specializing in drawn aluminum cans (200ml–500ml), 200#/202# SOT & RPT beverage ends, 307#–502# full aperture easy open ends, powder lids, tinplate lids, and lacquered aluminum coils (alloys 3104, 5182, 8011), we export to over 40 countries across Europe, the Americas, MEA, and APAC.
All products are backed by ISO 9001 quality management systems, FSSC 22000 food safety certifications, and comprehensive third-party lab migration reports.
Headquarters: Shanghai, China
