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UNS C15500 Silver-Bearing Copper

C15500 copper is a lightly alloyed grade of copper, formulated for primary forming into wrought products.

The properties of C15500 copper include eight 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 C15500 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

120 GPa 17 x 106 psi

Elongation at Break

3.0 to 37 %

Poisson's Ratio


Rockwell F Hardness

70 to 100

Shear Modulus

43 GPa 6.3 x 106 psi

Shear Strength

190 to 320 MPa 27 to 46 x 103 psi

Tensile Strength: Ultimate (UTS)

280 to 550 MPa 40 to 80 x 103 psi

Tensile Strength: Yield (Proof)

130 to 530 MPa 19 to 77 x 103 psi

Thermal Properties

Latent Heat of Fusion

210 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

1080 °C 1980 °F

Melting Onset (Solidus)

1080 °C 1970 °F

Specific Heat Capacity

390 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

350 W/m-K 200 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

90 % IACS

Electrical Conductivity: Equal Weight (Specific)

91 % IACS

Otherwise Unclassified Properties

Base Metal Price

33 % relative


8.9 g/cm3 560 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

42 MJ/kg 18 x 103 BTU/lb

Embodied Water

360 L/kg 43 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

15 to 84 MJ/m3

Resilience: Unit (Modulus of Resilience)

72 to 1210 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

8.6 to 17 points

Strength to Weight: Bending

11 to 17 points

Thermal Diffusivity

100 mm2/s

Thermal Shock Resistance

9.8 to 20 points

Alloy Composition

Among wrought copper alloys, the composition of C15500 copper is notable for including magnesium (Mg) and silver (Ag). Magnesium is used to improve strain hardenability. This increases strength but reduces the ability to form the alloy into complex shapes. Silver is used to increase recrystallization temperature in copper alloys. This permits operation at higher temperatures without permanent loss of mechanical properties.

Copper (Cu)Cu 99.75 to 99.853
Magnesium (Mg)Mg 0.080 to 0.13
Silver (Ag)Ag 0.027 to 0.1
Phosphorus (P)P 0.040 to 0.080
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