What are the standard testing methods for tin ingots to ensure compliance?

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  ​​Chemical Composition Analysis​​:
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    ​​ICP-AES (Inductively Coupled Plasma Atomic Emission Spectroscopy)​​: Precisely measures Sn and impurities (e.g., Cu, Fe, Zn).
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    ​​Titration​​: Used for specific impurities (e.g., As, Sb).
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  ​​Physical Property Tests​​:
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    ​​Density Measurement​​: Pure tin density should be 7.28–7.31 g/cm³ (verifies compactness).
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    ​​Hardness Test (e.g., Brinell)​​: Indirectly assesses alloy compliance.
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  ​​Visual Inspection​​: No pores, cracks, smooth surface (meets dimensional tolerances per GB/T 728).