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ISO Solder Alloy 161 (Sn60Pb39Cu1)

Solder alloy 161 is a tin-based soldering alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 161 is the ISO numeric designation for this material. Older literature may refer to this material as S-Sn60Pb39Cu1, but this is now discouraged.

The graph bars on the material properties cards below compare solder alloy 161 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

38 GPa 5.5 x 10⁶ psi

Elongation at Break

44 %

Poisson's Ratio

0.39

Shear Modulus

14 GPa 2.0 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

53 MPa 7.7 x 10³ psi

Thermal Properties

Latent Heat of Fusion

48 J/g

Melting Completion (Liquidus)

190 °C 370 °F

Melting Onset (Solidus)

180 °C 360 °F

Specific Heat Capacity

190 J/kg-K 0.045 BTU/lb-°F

Thermal Conductivity

49 W/m-K 28 BTU/h-ft-°F

Thermal Expansion

25 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

11 % IACS

Electrical Conductivity: Equal Weight (Specific)

11 % IACS

Otherwise Unclassified Properties

Density

8.9 g/cm³ 550 lb/ft³

Embodied Carbon

11 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

2.4 points

Stiffness to Weight: Bending

13 points

Strength to Weight: Axial

1.7 points

Strength to Weight: Bending

3.5 points

Thermal Diffusivity

29 mm²/s

Thermal Shock Resistance

4.1 points

Alloy Composition

Tin (Sn)Sn		59.5 to 60.5
Lead (Pb)Pb		37.3 to 39.3
Copper (Cu)Cu		1.2 to 1.6
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
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