What is the testing procedure for tin ingots?

 

Tin Ingot Testing Procedures​​

To ensure ​​purity, composition, and quality​​, tin ingots undergo these tests:

​​A. Chemical Composition Analysis​​

• • ​​Spectroscopy (ICP-OES, AAS, XRF)​​ → Measures ​​Sn purity & trace elements (Pb, Bi, As, Cu, Fe, Sb, Zn)​​.
• • ​​Wet Chemistry (Titration, Gravimetry)​​ → Traditional method for ​​impurity detection​​.

​​B. Physical Property Testing​​

• • ​​Melting Point Test​​ → Confirms ​​purity (pure Sn melts at 231.9°C)​​.
• • ​​Density Measurement​​ → Checks for ​​voids or impurities​​.
• • ​​Hardness Test (Brinell/Rockwell)​​ → Assesses ​​softness/malleability​​.

​​C. Mechanical & Functional Tests​​

• • ​​Tensile Test (if alloyed)​​ → Measures ​​strength (rare for pure Sn)​​.
• • ​​Solderability Test (for Sn-Pb or Sn-Ag-Cu alloys)​​ → Evaluates ​​wetting & bonding​​.

​​D. Impurity & Contamination Checks​​

• • ​​Lead (Pb) Content​​ → Critical for ​​food-safe & RoHS compliance​​ (max ​​0.1% Pb​​).
• • ​​Arsenic (As), Antimony (Sb), Bismuth (Bi)​​ → Affects ​​ductility & solder performance​​.