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ISO Solder Alloy 117 (Pb80Sn20)

Solder alloy 117 is a lead-based soldering alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 117 is the ISO numeric designation for this material. Older literature may refer to this material as S-Pb80Sn20, but this is now discouraged.

It has the lowest electrical conductivity and a moderately low ductility among lead-based solder alloys.

The graph bars on the material properties cards below compare solder alloy 117 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

11

Elastic (Young's, Tensile) Modulus

23 GPa 3.3 x 106 psi

Elongation at Break

20 %

Poisson's Ratio

0.42

Shear Modulus

8.1 GPa 1.2 x 106 psi

Tensile Strength: Ultimate (UTS)

33 MPa 4.8 x 103 psi

Thermal Properties

Latent Heat of Fusion

31 J/g

Melting Completion (Liquidus)

280 °C 540 °F

Melting Onset (Solidus)

180 °C 360 °F

Specific Heat Capacity

150 J/kg-K 0.035 BTU/lb-°F

Thermal Conductivity

37 W/m-K 21 BTU/h-ft-°F

Thermal Expansion

28 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

8.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

7.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

85 % relative

Density

11 g/cm3 660 lb/ft3

Embodied Carbon

6.1 kg CO2/kg material

Embodied Energy

100 MJ/kg 44 x 103 BTU/lb

Embodied Water

610 L/kg 73 gal/lb

Common Calculations

Stiffness to Weight: Axial

1.2 points

Stiffness to Weight: Bending

9.0 points

Strength to Weight: Axial

0.88 points

Strength to Weight: Bending

2.2 points

Thermal Diffusivity

24 mm2/s

Thermal Shock Resistance

3.7 points

Alloy Composition

Lead (Pb)Pb 78.4 to 80.5
Tin (Sn)Sn 19.5 to 20.5
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