How can high-quality tin ingots be certified? What conditions must be met?

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  ​​Purity Verification​​: Third-party testing (e.g., SGS, Intertek) confirms Sn content ≥ 99.90% (premium applications may require ≥ 99.95%).
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  ​​Impurity Control​​: Strict limits on harmful elements (e.g., Pb ≤ 0.01%).
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  ​​Production Process Certification​​: Compliance with ISO 9001 quality management, traceable raw materials (e.g., conflict-free minerals).
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  ​​Labeling Requirements​​: Ingots must be marked with manufacturer details, batch number, purity, and standard (e.g., "Sn 99.90% ISO 21638").
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