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ISO Solder Alloy 103 (Sn60Pb40)

Solder alloy 103 is a tin-based soldering alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 103 is the ISO numeric designation for this material. Older literature may refer to this material as S-Sn60Pb40, but this is now discouraged.

It has a moderately low heat capacity and a moderately high ductility among tin-based solder alloys.

The graph bars on the material properties cards below compare solder alloy 103 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 5.3 x 10⁶ psi

Elongation at Break

47 %

Poisson's Ratio

0.39

Shear Modulus

13 GPa 1.9 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

52 MPa 7.5 x 10³ psi

Thermal Properties

Latent Heat of Fusion

45 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

50 W/m-K 29 BTU/h-ft-°F

Thermal Expansion

24 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

11 % IACS

Electrical Conductivity: Equal Weight (Specific)

12 % IACS

Otherwise Unclassified Properties

Density

8.9 g/cm³ 560 lb/ft³

Embodied Carbon

10 kg CO₂/kg material

Embodied Energy

180 MJ/kg 77 x 10³ BTU/lb

Embodied Water

910 L/kg 110 gal/lb

Common Calculations

Stiffness to Weight: Axial

2.3 points

Stiffness to Weight: Bending

12 points

Strength to Weight: Axial

1.6 points

Strength to Weight: Bending

3.5 points

Thermal Diffusivity

30 mm²/s

Thermal Shock Resistance

4.3 points

Alloy Composition

Tin (Sn)Sn		59.5 to 60.5
Lead (Pb)Pb		38.8 to 40.5
Antimony (Sb)Sb		0 to 0.2
Bismuth (Bi)Bi		0 to 0.1
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