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ISO Solder Alloy 134 (Pb58Sn40Sb2)

Solder alloy 134 is a lead-based soldering alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 134 is the ISO numeric designation for this material. Older literature may refer to this material as S-Pb58Sn40Sb2, but this is now discouraged.

It has the highest base cost among lead-based solder alloys. In addition, it has a moderately high heat capacity and a moderately high electrical conductivity.

The graph bars on the material properties cards below compare solder alloy 134 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

Elastic (Young's, Tensile) Modulus

31 GPa 4.4 x 106 psi

Elongation at Break

31 %

Poisson's Ratio


Shear Modulus

11 GPa 1.6 x 106 psi

Tensile Strength: Ultimate (UTS)

38 MPa 5.5 x 103 psi

Thermal Properties

Latent Heat of Fusion

41 J/g

Melting Completion (Liquidus)

230 °C 450 °F

Melting Onset (Solidus)

190 °C 370 °F

Specific Heat Capacity

170 J/kg-K 0.040 BTU/lb-°F

Thermal Conductivity

45 W/m-K 26 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

10 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

100 % relative


9.6 g/cm3 600 lb/ft3

Embodied Carbon

8.5 kg CO2/kg material

Embodied Energy

140 MJ/kg 62 x 103 BTU/lb

Embodied Water

820 L/kg 98 gal/lb

Common Calculations

Stiffness to Weight: Axial

1.8 points

Stiffness to Weight: Bending

11 points

Strength to Weight: Axial

1.1 points

Strength to Weight: Bending

2.6 points

Thermal Diffusivity

28 mm2/s

Thermal Shock Resistance

3.4 points

Alloy Composition

Lead (Pb)Pb 56.5 to 58.5
Tin (Sn)Sn 39.5 to 40.5
Antimony (Sb)Sb 2.0 to 2.4
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