How are tin ingot purity levels classified? How do industry requirements differ?
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≥ 99.85% (Industrial Grade): Used in solder, tinplate (e.g., LME standard). - •
≥ 99.90% (High-Purity Grade): Electronics, food packaging (complies with EU RoHS Directive). - •
≥ 99.95% (Ultra-High Purity Grade): Semiconductors, PV ribbons (requires minimal oxygen content). Industry-Specific Requirements: - •
Electronics: Extremely low Pb (Pb ≤ 0.005%) for lead-free solder (e.g., IPC J-STD-006). - •
Chemical Industry: Low Fe (Fe ≤ 0.002%) to avoid catalytic reactions. -