What are the standard testing methods for tin ingots to ensure compliance?
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Chemical Composition Analysis: - •
ICP-AES (Inductively Coupled Plasma Atomic Emission Spectroscopy): Precisely measures Sn and impurities (e.g., Cu, Fe, Zn). - •
Titration: Used for specific impurities (e.g., As, Sb).
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Physical Property Tests: - •
Density Measurement: Pure tin density should be 7.28–7.31 g/cm³ (verifies compactness). - •
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).