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ISO Solder Alloy 135 (Pb69Sn30Sb1)

Solder alloy 135 is a lead-based soldering alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. 135 is the ISO numeric designation for this material. Older literature may refer to this material as S-Pb69Sn30Sb1, 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 135 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

27 GPa 3.9 x 10⁶ psi

Elongation at Break

20 %

Poisson's Ratio

0.41

Shear Modulus

9.5 GPa 1.4 x 10⁶ psi

Tensile Strength: Ultimate (UTS)

35 MPa 5.1 x 10³ psi

Thermal Properties

Latent Heat of Fusion

36 J/g

Melting Completion (Liquidus)

250 °C 480 °F

Melting Onset (Solidus)

190 °C 370 °F

Specific Heat Capacity

160 J/kg-K 0.038 BTU/lb-°F

Thermal Conductivity

42 W/m-K 24 BTU/h-ft-°F

Thermal Expansion

27 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

9.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

90 % relative

Density

10 g/cm³ 630 lb/ft³

Embodied Carbon

7.3 kg CO₂/kg material

Embodied Energy

120 MJ/kg 53 x 10³ BTU/lb

Embodied Water

720 L/kg 85 gal/lb

Common Calculations

Stiffness to Weight: Axial

1.5 points

Stiffness to Weight: Bending

9.9 points

Strength to Weight: Axial

1.0 points

Strength to Weight: Bending

2.4 points

Thermal Diffusivity

27 mm²/s

Thermal Shock Resistance

3.5 points

Alloy Composition

Lead (Pb)Pb		67.1 to 70
Tin (Sn)Sn		29.5 to 30.5
Antimony (Sb)Sb		0.5 to 1.8
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