ISO Solder Alloy 141 (Sn60Pb38Bi2)
Solder alloy 141 is a tin-based soldering alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 141 is the ISO numeric designation for this material. Older literature may refer to this material as S-Sn60Pb38Bi2, but this is now discouraged.
It has a moderately low electrical conductivity among tin-based solder alloys. In addition, it has a moderately low heat capacity and a moderately low thermal conductivity.
The graph bars on the material properties cards below compare solder alloy 141 to: tin-based solder alloys (top), all alloys in the same category (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
37 GPa 5.4 x 106 psi
Elongation at Break
39 %
Poisson's Ratio
0.39
Shear Modulus
13 GPa 1.9 x 106 psi
Tensile Strength: Ultimate (UTS)
54 MPa 7.8 x 103 psi
Thermal Properties
Latent Heat of Fusion
46 J/g
Melting Completion (Liquidus)
190 °C 370 °F
Melting Onset (Solidus)
180 °C 360 °F
Specific Heat Capacity
180 J/kg-K 0.044 BTU/lb-°F
Thermal Conductivity
48 W/m-K 28 BTU/h-ft-°F
Thermal Expansion
24 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
10 % IACS
Electrical Conductivity: Equal Weight (Specific)
10 % IACS
Otherwise Unclassified Properties
Density
8.9 g/cm3 550 lb/ft3
Embodied Carbon
11 kg CO2/kg material
Embodied Energy
180 MJ/kg 78 x 103 BTU/lb
Embodied Water
970 L/kg 120 gal/lb
Common Calculations
Stiffness to Weight: Axial
2.3 points
Stiffness to Weight: Bending
13 points
Strength to Weight: Axial
1.7 points
Strength to Weight: Bending
3.6 points
Thermal Diffusivity
29 mm2/s
Thermal Shock Resistance
4.3 points
Alloy Composition
| Sn | 59.5 to 60.5 | |
| Pb | 35.9 to 38.5 | |
| Bi | 2.0 to 3.0 | |
| Sb | 0 to 0.2 | |
| Ag | 0 to 0.1 | |
| In | 0 to 0.1 | |
| Cu | 0 to 0.080 | |
| Au | 0 to 0.050 | |
| As | 0 to 0.030 | |
| Fe | 0 to 0.020 | |
| Ni | 0 to 0.010 | |
| Cd | 0 to 0.0020 | |
| Al | 0 to 0.0010 | |
| Zn | 0 to 0.0010 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ISO 9453: Soft solder alloys - Chemical compositions and forms