Place of Origin:
China
Brand Name:
QuanJiang
Certification:
ISO9001
Model Number:
200#,50mm,Tinplate Lids
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The 200# (50mm) tinplate lid serves as a fundamental sealing component in the global food preservation industry. Engineered from high-purity electrolytic tinplate (SPTE), this specific 50mm diameter closure is tailored for smaller portion food cans, beverage containers, and specialty consumer tins. The foundation of this food can material relies on a multi-layered structure combining low-carbon thin steel sheet with a uniform commercial pure tin coating on both sides. This composition grants the product exceptional structural firmness, light-avoidance properties, and reliable mechanical stability under intense processing pressures.
Rather than relying on basic metal barriers, this tinplate lid is treated with cutting-edge interior and exterior lacquers, including specialized Golden Lacquer, Silver Lacquer, and Organosol coatings. These specialized polymer matrices ensure that the substrate remains entirely isolated from acidic or sulfur-rich contents inside the can, while maintaining an attractive exterior appearance that supports high-resolution CMYK lithographic printing. Whether applied as an easy-open end or a standard sanitary bottom cap, our 200# components provide absolute structural integrity, keeping internal environments perfectly hermetic and shielding consumer goods from external contaminants, moisture, and oxidation.
Exceptional Internal and External Corrosion Resistance: The primary function of this food can material is its defense against aggressive chemical environments. The combination of targeted tin coating weights (ranging from 1.1/1.1 to 5.6/5.6 g/m²) and robust lacquer applications protects the underlying steel from rusting, even when exposed to high-acid liquids, brines, or atmospheric humidity during long-term storage and oceanic transit.
Optimum Hermetic Sealing & Preservation: Designed precisely with a 49.5mm chuck diameter, these round lids guarantee a perfect fit with standard seaming chucks. This micro-precision fit prevents vacuum loss, seals out oxygen completely, and eliminates the risk of microbiological contamination, ensuring food freshness over extended shelf lives.
High Thermal Stability for Retort Processing: The steel substrate possesses precise hardness configurations (from soft TS245 to highly rigid TH620) and undergoes advanced batch annealing (BA) or continuous annealing (CA) tempering. This treatment allows the tinplate lid to withstand high-temperature sterilization, pasteurization, and vacuum pressures during the canning process without buckling or warping.
BPA-Free and Food-Grade Safety Compliance: All internal coatings, including our specialized aluminum paste and organosol linings, are completely food-contact compliant and available in BPA-free variations. They guarantee zero chemical migration, preserving the natural taste, odor, flavor, and color of the packaged food without any structural breakdown.
The detailed engineering tolerances and mechanical profiles for the 200# 50mm tinplate lid are categorized in the comprehensive data index below:
| Technical Parameter Index | Detailed Manufacturing Specifications |
| Model Classification | 200# Tin Can Lid / Bottom Cap Ends |
| Exact Dimensions | Chuck Diameter: 49.5 mm / Nominal Diameter: 50 mm |
| Base Metal Material | MR, SPCC Type Low-Carbon Cold-Rolled Steel |
| Substrate Options | Electrolytic Tinplate (SPTE) / Tin Free Steel (TFS) |
| Thickness Range | 0.17mm, 0.18mm, 0.19mm, 0.20mm (±0.005mm tolerance) |
| Temper Designation | BA (Batch Annealed) / CA (Continuous Annealed) |
| Hardness Spectrum | TS245, TS260, TS275, TS290 / TH415, TH435, TH520, TH550, TH580, TH620 |
| Tin Coating Mass | 1.1/1.1, 2.8/2.8, 5.6/5.6 g/m² (Customizable differential coatings) |
| Internal Protective Lacquer | Golden Lacquer, Silver Lacquer, Aluminum Paste, Organosol, BPA-Free |
| External Finish Options | Clear Lacquer, Gold Lacquer, High-Definition CMYK Printing, Laminating |
| Compliance Certification | ISO11950:1995, ISO 9001, SGS Food Grade, EWC Approved |
| Standard Export Packaging | Waterproof protective paper + Structural Carton / Fumigated Wooden Pallets |
The 200# 50mm tinplate lid is utilized extensively across diverse food processing sectors due to its superior adaptability and corrosion resistance:
Acidic Fruit and Vegetable Packing: This food can material is ideal for packing tomato pastes, citrus slices, diced pineapples, pickled vegetables, and tomato-based sauces. The high-grade internal gold or organosol lacquer prevents fruit acids from penetrating the tin layer, stopping dark spots or metallic flavor alterations.
High-Protein Seafood and Meat Processing: Canned tuna, sardines, salmon, pasteurized meat spreads, and sausages generate volatile sulfur compounds during high-heat retort sterilization. Our sulfur-resistant aluminum paste and silver lacquers prevent "sulfur blackening" (the formation of iron sulfide), keeping both the tinplate lid and the food looking clean and unblemished.
Condensed Milk and Dairy Packaging: Smaller 50mm cans are frequently used for sweetened condensed milk, evaporated creamer, and dairy-based formulas. The hermetic seal protects delicate milk fats from oxidizing and turns away light-induced vitamin degradation.
Dry Powder and Infant Nutrition Storage: Used as reliable bottom or top ends for baby formulas, powdered milk, premium tea leaves, and ground coffee beans. It maintains a moisture-free interior environment, preventing powder caking and preserving delicate aromas over years of storage.
Q1: Why is this tinplate lid highly effective at resisting corrosion from acidic foods?
A: The superior corrosion resistance stems from two protective layers. First, the electrolytic tin coating acts as a sacrificial anode protecting the base steel. Second, we apply specialized inner coatings like Organosol or Golden Lacquer. These inert barriers prevent acidic foods (like tomato paste or citrus fruit) from making direct contact with the metal, preventing rust and chemical reactions.
Q2: What parameters must be provided to receive an accurate industrial quote?
A: To provide the most accurate technical quote, please supply the exact steel grade (MR or SPCC), required width/diameter, material thickness (e.g., 0.18mm), desired tin coating weight (e.g., 2.8/2.8), internal lacquer type based on your food type, and your total order volume in metric tons or unit pieces.
Q3: Can these lids undergo high-temperature retort and sterilization cycles?
A: Yes, absolutely. This food can material is specifically formulated with high-temper structural hardeners (ranging up to TH620) via batch or continuous annealing. They are fully capable of enduring standard thermal sterilization and high-pressure steam cooking processes without showing any signs of physical distortion, micro-cracking, or lacquer peeling.
Q4: How are the lids protected against damage and moisture during long ocean transit?
A: We use a multi-stage export packaging system. The inner layers are wrapped using heavy-duty waterproof and anti-rust moisture barrier paper. The outer layer is reinforced with solid iron packaging shields, tightly strapped, and secured directly onto solid, fumigated wooden pallets. This eliminates moisture ingress and prevents corrosion during maritime transit.
Q5: Are your interior coatings fully certified for safe food contact and clean preservation?
A: Yes, all our tinplate components are manufactured strictly in accordance with international standard ISO11950:1995. Our manufacturing facilities and materials hold complete ISO 9001, SGS, and EWC certifications. We offer fully compliant BPA-free internal options that ensure zero food contamination, zero flavor migration, and long-term storage safety.
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