ISO Solder Alloy 116 (Pb70Sn30)
Solder alloy 116 is a lead-based soldering alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 116 is the ISO numeric designation for this material. Older literature may refer to this material as S-Pb70Sn30, but this is now discouraged.
It has the lowest ductility among the lead-based solder alloys in the database.
The graph bars on the material properties cards below compare solder alloy 116 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
12
Elastic (Young's, Tensile) Modulus
26 GPa 3.8 x 106 psi
Elongation at Break
18 %
Poisson's Ratio
0.42
Shear Modulus
9.3 GPa 1.4 x 106 psi
Tensile Strength: Ultimate (UTS)
34 MPa 5.0 x 103 psi
Thermal Properties
Latent Heat of Fusion
34 J/g
Melting Completion (Liquidus)
260 °C 490 °F
Melting Onset (Solidus)
180 °C 360 °F
Specific Heat Capacity
160 J/kg-K 0.037 BTU/lb-°F
Thermal Conductivity
41 W/m-K 24 BTU/h-ft-°F
Thermal Expansion
27 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
9.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.3 % IACS
Otherwise Unclassified Properties
Base Metal Price
90 % relative
Density
10 g/cm3 630 lb/ft3
Embodied Carbon
7.2 kg CO2/kg material
Embodied Energy
120 MJ/kg 52 x 103 BTU/lb
Embodied Water
690 L/kg 82 gal/lb
Common Calculations
Stiffness to Weight: Axial
1.5 points
Stiffness to Weight: Bending
9.8 points
Strength to Weight: Axial
0.94 points
Strength to Weight: Bending
2.3 points
Thermal Diffusivity
26 mm2/s
Thermal Shock Resistance
3.4 points
Alloy Composition
| Pb | 68.4 to 70.5 | |
| Sn | 29.5 to 30.5 | |
| Sb | 0 to 0.5 | |
| Bi | 0 to 0.25 | |
| Ag | 0 to 0.1 | |
| In | 0 to 0.1 | |
| Cu | 0 to 0.080 | |
| Au | 0 to 0.050 | |
| As | 0 to 0.030 | |
| Fe | 0 to 0.020 | |
| Ni | 0 to 0.010 | |
| Cd | 0 to 0.0050 | |
| Al | 0 to 0.0010 | |
| 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