High-speed precision-stamped stay-on tab lids, food-grade tinplate ends, and premium coil stock engineered for global beverage filling lines.
In modern metal packaging engineering, the Stay-On Tab (SOT) aluminum easy-open end represents a pinnacle of mechanical precision, materials science, and chemical barrier technology. Unlike traditional Ring Pull Tabs (RPT) where the tab detaches completely upon opening, the SOT design retains the tab attached to the lid shell after opening, eliminating littering hazards, improving consumer safety, and optimizing high-speed recycling loops.
As a leading Chinese manufacturer and global supplier established in Shanghai in 2010, Shanghai Friend Metals Technology Co., Ltd. provides comprehensive SOT services ranging from raw material slitting of 5182-H48 shell stock and 5052 tab stock to high-speed conversion stamping (up to 3,000 ends per minute per line), internal non-BPA lacquer application, and double-seam matching optimization for international beverage brands.
Strategic positioning in Shanghai combined with full vertical integration provides international buyers with unmatched cost efficiency, technical agility, and reliable supply chain security.
By operating integrated slitting and lacquering facilities for AA 3104, AA 5182, AA 5052, and 8011 aluminum coils, our factory controls chemical composition, gauge tolerance (±0.002mm), and coating weight from the mill stage forward. This eliminates third-party coil lead times and reduces production costs by 12–18% compared to European and North American converters.
Our stamping workshops feature multi-die conversion presses running at up to 3,000 ends per minute. Integrated 360-degree high-resolution CCD optical camera systems inspect 100% of finished SOT ends for micro-cracks, score line anomalies, tab misalignments, and pinholes, automatically ejecting non-conforming items before packaging.
Located near the Port of Shanghai—the world’s busiest container port—our logistics infrastructure allows seamless export execution. Finished SOT ends are packed in nitrogen-flushed polyethylene sleeves inside heavy-duty corrugated cartons or corrugated aluminum drums on heat-treated ISPM-15 wooden pallets, ensuring complete rust protection during 45+ days of maritime shipping.
From ultra-lightweight gauge reduction to laser-etched consumer interaction, stay-on tab lids are evolving rapidly to meet ESG mandates and modern branding demands.
Driven by corporate carbon-neutrality targets and aluminum metal pricing volatility, global beverage brands are transitioning from standard B64 lid contours to CDL (SuperEnd) and LOE (Lightweight Open End) profiles. CDL ends permit a thickness reduction from 0.22mm down to 0.20mm or 0.19mm while maintaining identical buckle resistance, reducing raw aluminum consumption by up to 10% per million ends.
Regulatory mandates across the European Union (EFSA) and North America (FDA 21 CFR 175.300) have accelerated the phase-out of traditional Bisphenol-A epoxy coatings. Next-generation SOT manufacturing utilizes high-molecular-weight polyester, acrylic, or vinyl-organosol linings that prevent flavor scalping and heavy acid corrosion in cider, wine, and carbonated energy drinks without chemical migration.
SOT ends are transforming into interactive marketing real estate. Advanced SOT suppliers offer high-speed under-tab laser engraving (for promotional codes and QR codes), colored tab anodizing (black, red, blue, green), and top-shell high-definition inkjet printing. This allows craft breweries and beverage companies to run anti-counterfeiting campaigns and instant consumer rewards.
Different liquid contents and powder products require specific lid alloys, tab profiles, lining compounds, and pressure tolerances.
Primary Model: 202# SOT B64 / CDL Aluminum End
Key Requirements: Tunnel pasteurization exposes aluminum ends to internal temperatures up to 65°C and pressures exceeding 5.5 bar. Our beer-grade SOT ends feature thick countersink walls and high-strength 5182-H48 shell alloys engineered to withstand 6.2 bar burst pressures without dome inversion or seal rupture.
Primary Model: 200# / 202# High-Flow SOT Lid
Key Requirements: Formulated for beverage carbonation levels up to 4.2 volumes of CO2. Uses a wide aperture score line (LOE opening) that enhances fluid pouring speed by 25% while maintaining strict zero-leakage seal integrity across ambient tropical storage conditions.
Primary Model: Heavy-Coated 202# SOT BPA-NI Lid
Key Requirements: Alcohol concentrations above 5% ABV combined with organic acids (citric, malic, tartaric) can degrade standard lacquers over time. We apply a dual-coat organosol coating system (8–12 g/m²) to prevent copper/aluminum ion leaching and preserve delicate flavor profiles over 18+ months of shelf life.
Primary Model: 401# (99mm) & 502# (127mm) Easy-Open / Powder Lids
Key Requirements: Powder products require zero oxygen transmission to prevent lipid oxidation. We supply aluminum and tinplate easy-open ends with nitrogen-flush capability, safety-folded edges (to prevent finger cuts), and optional clear view windows for consumer verification.
Primary Model: 300# Anti-Static Aluminum Easy-Open Lid
Key Requirements: Micro-electronic powders and high-purity chemical reagents are sensitive to static charge build-up during filling. Our specialized 300# anti-static aluminum lids prevent particle cling, ensuring clean sealing surface contact and moisture barrier integrity.
Primary Model: 307# Low-Profile Retort Easy-Open Lid
Key Requirements: Thermal sterilization (retorting at 121°C for 45 minutes) demands high heat resistance and rust-proof properties. Our low-profile 307# aluminum and tinplate lids feature high-temperature resistant compounds to survive autoclaving.
We do not merely supply metal hardware; we provide complete line integration engineering to guarantee zero seam leakage and zero downtime on high-speed filling lines.
The double seam formed between the SOT end curl and the can body flange is the most critical micro-structural joint in metal packaging. A seam defect as small as 0.02mm can lead to microbial ingress, loss of carbonation, or shelf life failure.
Our engineering team works directly with buyer technical teams to calibrate Ferrum, Angelus, Continental, or CFT seamers. Prior to commercial volume shipments, we issue full dimensional schematics, end curl parameters, and sample test lots for double-seam teardown analysis.
Every production batch manufactured at Shanghai Friend Metals undergoes a rigorous six-stage laboratory verification sequence before receiving an official Mill Test Certificate (MTC):
Comprehensive engineering parameters for procurement officers, plant managers, and packaging developers.
| Diameter Code | Nominal Size | Shell Alloy | Coating System | Buckle Strength | Target Application |
|---|---|---|---|---|---|
| 200# SOT | Ø 50 mm | AA 5182-H48 | BPA-NI Epoxy / Acrylic | ≥ 600 kPa | Sleek & Slim Beverage Cans, Carbonated Water |
| 202# SOT (B64) | Ø 52 mm | AA 5182-H48 | BPA-NI Organosol | ≥ 620 kPa | Craft Beer, CSD, Cider, Hard Seltzers |
| 202# SOT (CDL) | Ø 52 mm | AA 5182-H19 (0.20mm) | BPA-NI Water-based | ≥ 620 kPa | Ultra-lightweight High-Speed Beer Filling |
| 202# RPT | Ø 52 mm | AA 5182-H48 | Food-Grade Epoxy | ≥ 580 kPa | Resealable / Grab-and-Go Energy Drinks |
| 206# SOT | Ø 57 mm | AA 5182-H48 | BPA-NI Polyester | ≥ 550 kPa | Standard Juice & Energy Beverage Cans |
| 211# EOE | Ø 65 mm | Tinplate / Aluminum | Organosol / Epoxy | Retort Capable | Airtight Processed Food & Canned Meat |
| 300# EOE | Ø 73 mm | Aluminum 5182 | Anti-Static Lacquer | N/A (Dry Fill) | Electronic Powders & Specialty Chemicals |
| 307# EOE | Ø 83 mm | Aluminum / Tinplate | Retort Gold Lacquer | 121°C Retort Safe | Low-Profile Canned Seafood & Vegetables |
| 401# EOE | Ø 99 mm | AA 5052 / 5182 | BPA-NI Food Grade | Nitrogen Flush | Coffee Beans, Infant Powder, Protein Cans |
| 502# EOE | Ø 127 mm | AA 5052 / Tinplate | BPA-NI Clear/Gold | Vacuum Retention | Bulk Milk Powder, Nuts & Institutional Food |
Expert responses to critical commercial and technical questions encountered during global packaging procurement.
Explore our specialized RPT ends, anti-static powder lids, low-profile food closures, and eco-friendly aluminum can solutions.
