C15500 Copper vs. ASTM B780 Alloy

C15500 copper belongs to the copper alloys classification, while ASTM B780 alloy belongs to the otherwise unclassified metals. They have a modest 25% of their average alloy composition in common, which, by itself, doesn't mean much. There are 17 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is C15500 copper and the bottom bar is ASTM B780 alloy.

UNS C15500 Silver-Bearing Copper ASTM B780 Silver-Copper-Nickel Electrical Contact Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		120
Elastic (Young's, Tensile) Modulus, GPa		83

Elongation at Break, %		3.0 to 37
Elongation at Break, %		1.1 to 9.1

Poisson's Ratio		0.34
Poisson's Ratio		0.36

Shear Modulus, GPa		43
Shear Modulus, GPa		30

Shear Strength, MPa		190 to 320
Shear Strength, MPa		200 to 340

Tensile Strength: Ultimate (UTS), MPa		280 to 550
Tensile Strength: Ultimate (UTS), MPa		330 to 590

Thermal Properties

Latent Heat of Fusion, J/g		210
Latent Heat of Fusion, J/g		140

Specific Heat Capacity, J/kg-K		390
Specific Heat Capacity, J/kg-K		270

Thermal Expansion, µm/m-K		17
Thermal Expansion, µm/m-K		18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		90
Electrical Conductivity: Equal Volume, % IACS		70 to 76

Electrical Conductivity: Equal Weight (Specific), % IACS		91
Electrical Conductivity: Equal Weight (Specific), % IACS		62 to 68

Otherwise Unclassified Properties

Density, g/cm³		8.9
Density, g/cm³		10

Common Calculations

Stiffness to Weight: Axial, points		7.2
Stiffness to Weight: Axial, points		4.5

Stiffness to Weight: Bending, points		18
Stiffness to Weight: Bending, points		14

Strength to Weight: Axial, points		8.6 to 17
Strength to Weight: Axial, points		9.1 to 16

Strength to Weight: Bending, points		11 to 17
Strength to Weight: Bending, points		11 to 15

Thermal Shock Resistance, points		9.8 to 20
Thermal Shock Resistance, points		16 to 29

Alloy Composition

Cadmium (Cd), %		0
Cadmium (Cd), %		0 to 0.050

Copper (Cu), %		99.75 to 99.853
Copper (Cu), %		23.5 to 25.7

Iron (Fe), %		0
Iron (Fe), %		0 to 0.050

Lead (Pb), %		0
Lead (Pb), %		0 to 0.030

Magnesium (Mg), %		0.080 to 0.13
Magnesium (Mg), %		0

Nickel (Ni), %		0
Nickel (Ni), %		0.35 to 0.65

Phosphorus (P), %		0.040 to 0.080
Phosphorus (P), %		0

Silver (Ag), %		0.027 to 0.1
Silver (Ag), %		74 to 76

Zinc (Zn), %		0
Zinc (Zn), %		0 to 0.060

Residuals, %		0 to 0.2
Residuals, %		0