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ISO Solder Alloy 114 (Pb60Sn40)

Solder alloy 114 is a lead-based soldering alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 114 is the ISO numeric designation for this material. Older literature may refer to this material as S-Pb60Sn40, but this is now discouraged.

It has a moderately high heat capacity among lead-based solder alloys. In addition, it has a moderately high electrical conductivity and a moderately high tensile strength.

The graph bars on the material properties cards below compare solder alloy 114 to: lead-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

Brinell Hardness


Elastic (Young's, Tensile) Modulus

30 GPa 4.3 x 106 psi

Elongation at Break

25 %

Poisson's Ratio


Shear Modulus

11 GPa 1.5 x 106 psi

Tensile Strength: Ultimate (UTS)

37 MPa 5.4 x 103 psi

Thermal Properties

Latent Heat of Fusion

38 J/g

Melting Completion (Liquidus)

240 °C 460 °F

Melting Onset (Solidus)

180 °C 360 °F

Specific Heat Capacity

170 J/kg-K 0.040 BTU/lb-°F

Thermal Conductivity

44 W/m-K 25 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

10 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

95 % relative


9.7 g/cm3 610 lb/ft3

Embodied Carbon

8.3 kg CO2/kg material

Embodied Energy

140 MJ/kg 61 x 103 BTU/lb

Embodied Water

760 L/kg 91 gal/lb

Common Calculations

Stiffness to Weight: Axial

1.7 points

Stiffness to Weight: Bending

11 points

Strength to Weight: Axial

1.1 points

Strength to Weight: Bending

2.6 points

Thermal Diffusivity

27 mm2/s

Thermal Shock Resistance

3.4 points

Alloy Composition

Lead (Pb)Pb 58.4 to 60.5
Tin (Sn)Sn 39.5 to 40.5
Antimony (Sb)Sb 0 to 0.5
Bismuth (Bi)Bi 0 to 0.25
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 0.0050
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