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UNS C19800 Zinc-Tin-Magnesium Copper

C19800 copper is a lightly alloyed grade of copper, formulated for primary forming into wrought products. It can have a moderately high tensile strength and a moderately low ductility among wrought coppers.

The properties of C19800 copper include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C19800 copper to: wrought coppers (top), all copper alloys (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

110 GPa 17 x 106 psi

Elongation at Break

9.0 to 12 %

Poisson's Ratio


Shear Modulus

43 GPa 6.2 x 106 psi

Shear Strength

260 to 330 MPa 38 to 47 x 103 psi

Tensile Strength: Ultimate (UTS)

430 to 550 MPa 63 to 80 x 103 psi

Tensile Strength: Yield (Proof)

420 to 550 MPa 61 to 80 x 103 psi

Thermal Properties

Latent Heat of Fusion

210 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

1070 °C 1960 °F

Melting Onset (Solidus)

1050 °C 1920 °F

Specific Heat Capacity

390 J/kg-K 0.093 BTU/lb-°F

Thermal Conductivity

260 W/m-K 150 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

61 % IACS

Electrical Conductivity: Equal Weight (Specific)

62 % IACS

Otherwise Unclassified Properties

Base Metal Price

30 % relative


8.9 g/cm3 550 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

43 MJ/kg 18 x 103 BTU/lb

Embodied Water

320 L/kg 38 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

49 to 52 MJ/m3

Resilience: Unit (Modulus of Resilience)

770 to 1320 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

14 to 17 points

Strength to Weight: Bending

14 to 17 points

Thermal Diffusivity

75 mm2/s

Thermal Shock Resistance

15 to 20 points

Alloy Composition

Among wrought copper alloys, the composition of C19800 copper is notable for including magnesium (Mg). Magnesium is used to improve strain hardenability. This increases strength but reduces the ability to form the alloy into complex shapes.

Copper (Cu)Cu 95.7 to 99.47
Zinc (Zn)Zn 0.3 to 1.5
Tin (Sn)Sn 0.1 to 1.0
Magnesium (Mg)Mg 0.1 to 1.0
Iron (Fe)Fe 0.020 to 0.5
Phosphorus (P)P 0.010 to 0.1
Residualsres. 0 to 0.2

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

Copper Alloys: Preparation, Properties and Applications, Michael Naboka and Jennifer Giordano (editors), 2013