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ISO Solder Alloy 113 (Pb55Sn45)

Solder alloy 113 is a lead-based soldering alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 113 is the ISO numeric designation for this material. Older literature may refer to this material as S-Pb55Sn45, but this is now discouraged.

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

The graph bars on the material properties cards below compare solder alloy 113 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

32 GPa 4.6 x 10⁶ psi

Elongation at Break

32 %

Poisson's Ratio

0.4

Shear Modulus

11 GPa 1.6 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

39 MPa 5.7 x 10³ psi

Thermal Properties

Latent Heat of Fusion

40 J/g

Melting Completion (Liquidus)

230 °C 440 °F

Melting Onset (Solidus)

180 °C 360 °F

Specific Heat Capacity

170 J/kg-K 0.041 BTU/lb-°F

Thermal Conductivity

46 W/m-K 27 BTU/h-ft-°F

Thermal Expansion

26 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

10 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.8 % IACS

Otherwise Unclassified Properties

Density

9.5 g/cm³ 590 lb/ft³

Embodied Carbon

8.9 kg CO₂/kg material

Embodied Energy

150 MJ/kg 65 x 10³ BTU/lb

Embodied Water

800 L/kg 95 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

2.7 points

Thermal Diffusivity

28 mm²/s

Thermal Shock Resistance

3.4 points

Alloy Composition

Lead (Pb)Pb		53.4 to 55.5
Tin (Sn)Sn		44.5 to 45.5
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