Frequently Asked Questions – Your Complete Guide to Tinplate Coil Procurement
2026/05/11
Dateline: [wuxi, Date] – To help procurement managers navigate the technical and commercial aspects of sourcing Electrolytic Tinplate Coils for Chemical Drums, we have compiled six of the most frequently asked questions with detailed answers.
FAQ 3: How does magnetic recycling actually work for tinplate drums?
A: The iron base of tinplate is ferromagnetic. When chemical drums reach end-of-life, they are shredded and passed through a magnetic separator. The magnetic force extracts tinplate fragments from mixed waste streams, achieving over 80% recovery rates. Recovered steel is then remelted to produce new tinplate or other steel products, closing the material loop.
FAQ 4: What is the difference between equal and differential tin coating, and which should I choose?
A: Equal coating (e.g., 5.6/5.6 g/m²) applies the same tin weight to both sides of the coil. This is suitable when both interior and exterior require identical corrosion protection. Differential coating (e.g., 5.6/2.8 g/m²) applies a heavier coating to one side—typically the interior that contacts aggressive chemicals—and a lighter coating to the exterior. Differential coatings reduce tin consumption by 15–30% while maintaining performance where it matters most. For most chemical drums containing acids, alkalis, or solvents, differential coating offers the best value.
FAQ 5: Can you provide samples before full production?
A: Yes. Sample coils (minimum 50kg) can be provided according to your specified thickness, temper, coating, and surface finish. Sample lead time is typically 7 business days. For standard 0.2mm material, samples may be available from existing stock within 48 hours.
FAQ 6: What are the minimum order quantities (MOQ) for custom specifications?
A: For standard equal coatings (2.8/2.8, 5.6/5.6) and common tempers (T2.5, T3, DR9), MOQ is 20 metric tons. For differential coatings or non-standard widths (e.g., 720mm, 950mm), MOQ is 50 metric tons. Trial orders below MOQ are negotiable at a 10–15% premium to cover mill scheduling costs.
FAQ 7 (Bonus): How do I verify that the tinplate meets ASTM623M-2002 or JIS3303-2002 standards?
A: Every shipment includes a mill test certificate (MTC) signed by the producing mill and verified by our QC team. The certificate lists chemical composition, mechanical properties (yield strength, tensile strength, elongation), tin coating weight (measured via X-ray fluorescence), and surface finish classification. Third-party inspections (SGS, BV, Intertek) can be arranged at buyer’s cost.
FAQ 8: What is your after-sales policy if the coils arrive with rust or edge damage?
A: We provide a comprehensive guarantee. If damage is proven to be pre-shipment (verified by photographic evidence and third-party survey), we offer replacement material or a full refund for the affected portion. Claims must be filed within 14 days of arrival at the destination port. Our professional packing teams follow seaworthy export standards to minimize transit risks, including VCI paper, plastic moisture barriers, and reinforced steel strapping.
