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Solder Alloy 181 vs. ASTM A369 Grade FP21

Solder alloy 181 belongs to the otherwise unclassified metals classification, while ASTM A369 grade FP21 belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is solder alloy 181 and the bottom bar is ASTM A369 grade FP21.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 18
190
Elongation at Break, % 41
20
Poisson's Ratio 0.44
0.29
Shear Modulus, GPa 6.1
74
Tensile Strength: Ultimate (UTS), MPa 27
470

Thermal Properties

Latent Heat of Fusion, J/g 26
260
Melting Completion (Liquidus), °C 310
1470
Melting Onset (Solidus), °C 300
1430
Specific Heat Capacity, J/kg-K 130
470
Thermal Conductivity, W/m-K 24
41
Thermal Expansion, µm/m-K 29
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 9.3
7.7
Electrical Conductivity: Equal Weight (Specific), % IACS 7.4
8.8

Otherwise Unclassified Properties

Density, g/cm3 11
7.8
Embodied Carbon, kg CO2/kg material 6.2
1.8
Embodied Energy, MJ/kg 100
23

Common Calculations

Stiffness to Weight: Axial, points 0.86
13
Stiffness to Weight: Bending, points 7.7
24
Strength to Weight: Axial, points 0.66
17
Strength to Weight: Bending, points 1.8
17
Thermal Diffusivity, mm2/s 16
11
Thermal Shock Resistance, points 3.8
14

Alloy Composition

Aluminum (Al), % 0 to 0.0010
0
Antimony (Sb), % 0 to 0.2
0
Arsenic (As), % 0 to 0.030
0
Bismuth (Bi), % 0 to 0.1
0
Cadmium (Cd), % 0 to 0.0020
0
Carbon (C), % 0
0.050 to 0.15
Chromium (Cr), % 0
2.7 to 3.4
Copper (Cu), % 0 to 0.080
0
Gold (Au), % 0 to 0.050
0
Indium (In), % 0 to 0.1
0
Iron (Fe), % 0 to 0.020
94.3 to 96.2
Lead (Pb), % 96.2 to 98
0
Manganese (Mn), % 0
0.3 to 0.6
Molybdenum (Mo), % 0
0.8 to 1.1
Nickel (Ni), % 0 to 0.010
0
Phosphorus (P), % 0
0 to 0.025
Silicon (Si), % 0
0 to 0.5
Silver (Ag), % 2.0 to 3.0
0
Sulfur (S), % 0
0 to 0.025
Tin (Sn), % 0 to 0.25
0
Zinc (Zn), % 0 to 0.0010
0