1. Define your product and compliance requirements first
Before contacting suppliers, specify:
Product type: tinplate food can, lid, tin box, aerosol?
Food contact use: direct contact, acidic/high-fat/high-salt food, retort, dry food
Target market regulations: FDA (US), EU 1935/2004 + GMP, LFGB (Germany), GB 4806 (China), etc.
Required tests: overall migration, heavy metals, BPA/BADGE, coating adhesion, corrosion resistance, sterility/retort performance
Tinplate specification: ETP or TFS, thickness, temper, tin coating weight, lacquer type (epoxy/phenolic/acrylic), internal/external coating
Can format: diameter, height, seam type, easy-open end, necked-in, printing requirements
2. Screen for food-grade metal-packaging specialists
Prioritize manufacturers that:
Produce food-contact tinplate packaging as a core business, not a sideline
Have export experience to your target market
Can provide food-contact declarations and migration test reports
Use food-grade internal lacquers and control coating cure/corrosion
Have in-house printing, lacquering, can-making, and seam-welding capabilities
Can show stable customers or references in food/beverage categories
3. Verify certifications and audit reports
Ask for:
ISO 9001, ISO 14001, ISO 22000/FSSC 22000/BRCGS/HACCP where applicable
Food-contact compliance declarations for the exact substrate and coating
Test reports from accredited third-party labs for the target market
Factory audit reports: social compliance, quality, food safety, environmental
Material certificates for tinplate and coating suppliers
Traceability system from raw material lot to finished goods
Do not accept a generic certificate. Confirm that the certificate scope covers metal food packaging and the specific factory.
4. Audit the factory and production controls
Key areas to check:
Raw-material storage and lot traceability
Tinplate slitting, printing, lacquering, curing, can body forming, welding, necking, seaming, and leak testing
Coating thickness and cure control
Solder/lead-free and welding consistency
Internal lacquer coverage, especially at seams and scratches
Cleanroom or hygienic production controls where required
In-process inspection and finished-product AQL sampling
Leak, pressure, and corrosion tests
Calibration records for gauges and test equipment
Pest control, foreign-body control, and worker hygiene
5. Test samples before mass production
Request pre-production samples and verify:
Dimensions and tolerances
Print quality and color consistency
Internal coating continuity and adhesion
Corrosion resistance with your actual food product
Seam quality and leak tightness
Retort or pasteurization performance if applicable
Migration/food-contact test reports
Compatibility with your filling, seaming, and distribution process
For high-risk products, run a pilot batch and shelf-life or accelerated corrosion test.
6. Evaluate quality-management and documentation capability
A reliable supplier should provide:
Certificate of Analysis (COA) per lot
Declaration of Compliance (DoC) for food-contact materials
Material safety and coating information
Migration test reports
Batch traceability records
Deviation and corrective-action process
PPAP/FAI or first-article inspection if you are an industrial buyer
Clear change-control notification for materials, coatings, or processes
7. Check export and trade capability
Confirm:
Export license and customs experience
Incoterms capability: FOB, CIF, DDP
MOQ and mold/tooling costs
Lead time and production capacity
Packaging for ocean transport and anti-rust protection
Loading supervision and container inspection
Payment terms and currency
Ability to support third-party inspection: SGS, BV, TÜV, Intertek, etc.
8. Use a structured RFQ and scorecard
Your RFQ should require:
Technical drawing and specification
Tinplate grade, thickness, temper, tin coating
Coating system and food-contact compliance
Printing colors and artwork control
Sample lead time and mass-production lead time
MOQ, price breaks, tooling cost
Inspection standard and AQL level
Required documents and test reports
Warranty and non-conformance handling
Score suppliers on:
Food-safety compliance: 30%
Technical capability and equipment: 20%
Quality system and audit results: 20%
Export experience and references: 15%
Cost, MOQ, and lead time: 15%
