Cost-Effective Differential Tin Coating 100#/25# Electrolytic Tinplate for Industrial Pail Drum Manufacturing
This differential tin coating electrolytic tinplate features a premium 100# (11.2 g/m²) interior tin layer paired with a cost-optimized 25# (2.8 g/m²) exterior coating. Manufactured from MR-grade low-carbon cold-rolled steel substrate using advanced electrolytic deposition technology, this ETP steel sheet delivers exceptional interior corrosion protection for harsh chemical contents while maintaining economical exterior coverage. Designed specifically for industrial pail and drum manufacturers who require robust packaging solutions without compromising on cost efficiency.
Key Features
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Differential Tin Coating Technology:
The 100#/25# asymmetric coating applies heavy tin protection (11.2 g/m²) on the interior surface in contact with contents while using a lighter 2.8 g/m² coating on the exterior, reducing total tin consumption by up to 40% compared to equal 100#/100# coating while maintaining superior internal corrosion resistance.
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Enhanced Interior Corrosion Resistance:
The 11.2 g/m² tin layer forms a robust barrier against acidic and alkaline industrial contents including paints, solvents, lubricants, and chemical formulations. Combined with a passivation treatment, this coating prevents pitting corrosion and ensures long-term storage stability.
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Excellent Deep-Drawing Formability:
The MR-grade steel base with T4 temper provides the ideal balance of strength and ductility required for deep-drawing operations in pail and drum body manufacturing. The uniform tin coating maintains integrity during severe forming processes without cracking or delamination.
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Cost-Optimized Material Solution:
By applying differential rather than equal tin coating weights, manufacturers realize significant material cost savings while achieving identical performance for applications where only one side requires maximum protection. This translates to lower per-unit packaging costs without quality compromise.
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Consistent Weldability and Seaming:
The electroplated tin coating provides reliable and consistent welding characteristics essential for side-seam welding in cylindrical pail construction. The uniform coating thickness ensures strong, leak-proof seams that meet industrial packaging standards including UN-rated dangerous goods container requirements.
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Superior Surface Adhesion:
The exterior surface provides excellent adhesion for exterior lacquers, lithographic printing, and labeling. The calibrated coating weight allows paint and coating manufacturers to achieve consistent exterior finishing with standard industrial coating systems.
Technical Specifications
| Parameter |
Specification |
| Material Grade |
MR (Medium Rigidity) Low-Carbon Steel |
| Tin Coating (Interior/Exterior) |
100#/25# (11.2/2.8 g/m²) Differential |
| Available Coating Combinations |
50#/25#, 75#/25#, 75#/50#, 100#/25#, 100#/50#, 100#/75# |
| Thickness Range |
0.20mm - 0.45mm |
| Width Range |
600mm - 1050mm |
| Temper (Hardness) |
T3, T4, T5 (Single Reduced); DR8, DR9 (Double Reduced) |
| Surface Finish |
Stone (R), Bright (B), Silver (S), Matte (M) |
| Annealing Type |
Continuous Annealing (CA) or Batch Annealing (BA) |
| Applicable Standards |
JIS G3303, ASTM A623, EN 10203, GB/T 2520 |
| Passivation Treatment |
Sodium Dichromate (311) or Cathodic (CS) |
| Form Available |
Coil or Cut-to-Length Sheet |
Applications
This differential coating electrolytic tinplate is engineered for manufacturers of industrial packaging solutions. Primary applications include 5-gallon and 55-gallon steel pails and drums for paint, coatings, and chemical products, lubricant and grease containers requiring heavy interior protection, industrial solvent storage containers, adhesive and sealant packaging, and agricultural chemical drums. The differential coating approach is particularly valuable for export-oriented packaging manufacturers serving cost-sensitive markets where interior corrosion protection is critical but exterior exposure conditions are less demanding. The material meets international industrial packaging standards and can be certified for UN dangerous goods packaging upon request.
Packaging & Quality Assurance
Each coil or sheet bundle is carefully packaged with rust-proof paper wrapping, metal edge protectors, steel strapping, and fumigated wooden pallets to ensure damage-free delivery. Every production batch undergoes rigorous quality inspection including coating weight measurement by coulometric analysis, mechanical property testing per ASTM standards, surface roughness profiling, and visual inspection for defects. Mill test certificates (MTC) and third-party inspection reports from SGS or Bureau Veritas are available upon request. Our ISO-certified quality management system ensures consistent product quality from batch to batch, supported by a minimum 300-ton weekly supply capacity to meet large-volume industrial orders.
