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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


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


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

Tin (Sn)Sn 59.5 to 60.5
Lead (Pb)Pb 35.9 to 38.5
Bismuth (Bi)Bi 2.0 to 3.0
Antimony (Sb)Sb 0 to 0.2
Silver (Ag)Ag 0 to 0.1
Indium (In)In 0 to 0.1
Copper (Cu)Cu 0 to 0.080
Gold (Au)Au 0 to 0.050
Arsenic (As)As 0 to 0.030
Iron (Fe)Fe 0 to 0.020
Nickel (Ni)Ni 0 to 0.010
Cadmium (Cd)Cd 0 to 0.0020
Aluminum (Al)Al 0 to 0.0010
Zinc (Zn)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