Menu (ESC)

ISO Solder Alloy 811 (IEC Z80B30, Sn89Zn8Bi3)

Solder alloy 811 is a tin-based soldering alloy. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. Z80B30 is the IEC 60672 type for this material. 811 is the ISO numeric designation. Older literature may refer to this material as S-Sn89Zn8Bi3, but this is now discouraged.

It has a moderately high heat capacity among the tin-based solder alloys in the database.

The graph bars on the material properties cards below compare solder alloy 811 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

52 GPa 7.6 x 106 psi

Elongation at Break

38 %

Poisson's Ratio


Shear Modulus

19 GPa 2.8 x 106 psi

Tensile Strength: Ultimate (UTS)

53 MPa 7.7 x 103 psi

Thermal Properties

Latent Heat of Fusion

63 J/g

Melting Completion (Liquidus)

200 °C 390 °F

Melting Onset (Solidus)

190 °C 370 °F

Specific Heat Capacity

230 J/kg-K 0.056 BTU/lb-°F

Thermal Conductivity

59 W/m-K 34 BTU/h-ft-°F

Thermal Expansion

22 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

14 % IACS

Electrical Conductivity: Equal Weight (Specific)

17 % IACS

Otherwise Unclassified Properties


7.3 g/cm3 460 lb/ft3

Embodied Carbon

14 kg CO2/kg material

Embodied Energy

240 MJ/kg 100 x 103 BTU/lb

Embodied Water

1200 L/kg 140 gal/lb

Common Calculations

Stiffness to Weight: Axial

4.0 points

Stiffness to Weight: Bending

17 points

Strength to Weight: Axial

2.0 points

Strength to Weight: Bending

4.3 points

Thermal Diffusivity

35 mm2/s

Thermal Shock Resistance

3.3 points

Alloy Composition

Tin (Sn)Sn 87.8 to 89.7
Zinc (Zn)Zn 7.5 to 8.5
Bismuth (Bi)Bi 2.8 to 3.2
Silver (Ag)Ag 0 to 0.1
Antimony (Sb)Sb 0 to 0.1
Indium (In)In 0 to 0.1
Lead (Pb)Pb 0 to 0.070
Copper (Cu)Cu 0 to 0.050
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

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