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Solder Alloy 502 vs. Solder Alloy 503

Both solder alloy 502 and solder alloy 503 are otherwise unclassified metals. Both are furnished in the as-fabricated (no temper or treatment) condition. They have a very high 97% of their average alloy composition in common.

For each property being compared, the top bar is solder alloy 502 and the bottom bar is solder alloy 503.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 53
54
Elongation at Break, % 34
30
Poisson's Ratio 0.36
0.36
Shear Modulus, GPa 19
20
Tensile Strength: Ultimate (UTS), MPa 58
57

Thermal Properties

Latent Heat of Fusion, J/g 66
69
Melting Completion (Liquidus), °C 350
380
Melting Onset (Solidus), °C 220
220
Specific Heat Capacity, J/kg-K 230
230
Thermal Conductivity, W/m-K 47
61
Thermal Expansion, µm/m-K 22
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 12
14
Electrical Conductivity: Equal Weight (Specific), % IACS 15
17

Otherwise Unclassified Properties

Density, g/cm3 7.4
7.5
Embodied Carbon, kg CO2/kg material 15
16
Embodied Energy, MJ/kg 260
270

Common Calculations

Stiffness to Weight: Axial, points 4.0
4.1
Stiffness to Weight: Bending, points 17
17
Strength to Weight: Axial, points 2.2
2.1
Strength to Weight: Bending, points 4.5
4.4
Thermal Diffusivity, mm2/s 28
35
Thermal Shock Resistance, points 3.6
3.5

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0 to 0.0010
Antimony (Sb), % 0 to 0.1
0 to 0.1
Arsenic (As), % 0 to 0.030
0 to 0.030
Bismuth (Bi), % 0 to 0.080
0 to 0.080
Cadmium (Cd), % 0 to 0.0020
0 to 0.0020
Copper (Cu), % 3.5 to 4.5
5.5 to 6.5
Gold (Au), % 0 to 0.050
0 to 0.050
Indium (In), % 0 to 0.1
0 to 0.1
Iron (Fe), % 0 to 0.020
0 to 0.020
Lead (Pb), % 0 to 0.070
0 to 0.070
Nickel (Ni), % 0 to 0.010
0 to 0.010
Silver (Ag), % 0.8 to 1.2
1.8 to 2.2
Tin (Sn), % 93.8 to 95.7
90.8 to 92.7
Zinc (Zn), % 0 to 0.0010
0 to 0.0010