Home>Other Metal AlloyUp Two>Lead-Based Solder AlloyUp One

ISO Solder Alloy 115 (Pb65Sn35)

Solder alloy 115 is a lead-based soldering alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 115 is the ISO numeric designation for this material. Older literature may refer to this material as S-Pb65Sn35, but this is now discouraged.

It has a moderately low ductility among the lead-based solder alloys in the database.

The graph bars on the material properties cards below compare solder alloy 115 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

Elastic (Young's, Tensile) Modulus

28 GPa 4.1 x 10⁶ psi

Elongation at Break

22 %

Poisson's Ratio

0.41

Shear Modulus

10 GPa 1.4 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

36 MPa 5.2 x 10³ psi

Thermal Properties

Latent Heat of Fusion

36 J/g

Melting Completion (Liquidus)

250 °C 470 °F

Melting Onset (Solidus)

180 °C 360 °F

Specific Heat Capacity

160 J/kg-K 0.039 BTU/lb-°F

Thermal Conductivity

43 W/m-K 25 BTU/h-ft-°F

Thermal Expansion

27 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

9.8 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.9 % IACS

Otherwise Unclassified Properties

Base Metal Price

95 % relative

Density

9.9 g/cm³ 620 lb/ft³

Embodied Carbon

7.8 kg CO₂/kg material

Embodied Energy

130 MJ/kg 56 x 10³ BTU/lb

Embodied Water

730 L/kg 87 gal/lb

Common Calculations

Stiffness to Weight: Axial

1.6 points

Stiffness to Weight: Bending

10 points

Strength to Weight: Axial

1.0 points

Strength to Weight: Bending

2.4 points

Thermal Diffusivity

27 mm²/s

Thermal Shock Resistance

3.4 points

Alloy Composition

Lead (Pb)Pb		63.4 to 65.5
Tin (Sn)Sn		34.5 to 35.5
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