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  What are the key specifications for standard tin ingots?

1. 1.
   ​​Chemical Composition​​
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     Minimum Sn content: 99.85% (LME/ISO)
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     Typical impurity limits:
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       Pb ≤ 0.05%
     • •
       As ≤ 0.02%
     • •
       Sb ≤ 0.02%
     • •
       Bi ≤ 0.02%
2. 2.
   ​​Physical Properties​​
   • •
     Density: 7.28-7.31 g/cm³
   • •
     Melting point: 231.9°C
   • •
     Hardness: 3-4 Mohs
3. 3.
   ​​Dimensions •
   • Weight: 25-40kg
   • •
     Dimensions: ~230×110×50mm
   • •
     Tolerance: ±2% weight variation
4. 4.
   ​​Surface Quality​​
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     Smooth, clean surface
   • •
     Free from cracks/porosity
   • •
     Allowed slight oxidation
5. 5.
   ​​Standards Compliance​​
   • •
     ISO 21638:2020
   • •
     ASTM B339
   • •
     GB/T 728-2010
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