How are tin ingot purity levels classified? How do industry requirements differ?

• •
  ​​≥ 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.
•