C81400 Copper vs. ASTM B541 Gold

C81400 copper belongs to the copper alloys classification, while ASTM B541 gold belongs to the otherwise unclassified metals. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.

For each property being compared, the top bar is C81400 copper and the bottom bar is ASTM B541 gold.

UNS C81400 (Alloy 70C) Beryllium Copper ASTM B541 Gold Electrical Contact Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		120
Elastic (Young's, Tensile) Modulus, GPa		110

Elongation at Break, %		11
Elongation at Break, %		6.0 to 14

Poisson's Ratio		0.34
Poisson's Ratio		0.4

Shear Modulus, GPa		41
Shear Modulus, GPa		38

Tensile Strength: Ultimate (UTS), MPa		370
Tensile Strength: Ultimate (UTS), MPa		670 to 1180

Tensile Strength: Yield (Proof), MPa		250
Tensile Strength: Yield (Proof), MPa		480 to 900

Thermal Properties

Latent Heat of Fusion, J/g		210
Latent Heat of Fusion, J/g		90

Melting Completion (Liquidus), °C		1090
Melting Completion (Liquidus), °C		1110

Melting Onset (Solidus), °C		1070
Melting Onset (Solidus), °C		930

Specific Heat Capacity, J/kg-K		390
Specific Heat Capacity, J/kg-K		170

Thermal Expansion, µm/m-K		17
Thermal Expansion, µm/m-K		13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		60
Electrical Conductivity: Equal Volume, % IACS		7.7 to 12

Electrical Conductivity: Equal Weight (Specific), % IACS		61
Electrical Conductivity: Equal Weight (Specific), % IACS		4.0 to 6.2

Otherwise Unclassified Properties

Density, g/cm³		8.9
Density, g/cm³		17

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m³		36
Resilience: Ultimate (Unit Rupture Work), MJ/m³		65 to 91

Resilience: Unit (Modulus of Resilience), kJ/m³		260
Resilience: Unit (Modulus of Resilience), kJ/m³		1090 to 3830

Stiffness to Weight: Axial, points		7.3
Stiffness to Weight: Axial, points		3.4

Stiffness to Weight: Bending, points		18
Stiffness to Weight: Bending, points		9.0

Strength to Weight: Axial, points		11
Strength to Weight: Axial, points		11 to 19

Strength to Weight: Bending, points		13
Strength to Weight: Bending, points		9.8 to 14

Thermal Shock Resistance, points		13
Thermal Shock Resistance, points		36 to 63

Alloy Composition

Beryllium (Be), %		0.020 to 0.1
Beryllium (Be), %		0

Chromium (Cr), %		0.6 to 1.0
Chromium (Cr), %		0

Copper (Cu), %		98.4 to 99.38
Copper (Cu), %		13.5 to 15.5

Gold (Au), %		0
Gold (Au), %		70.5 to 72.5

Platinum (Pt), %		0
Platinum (Pt), %		8.0 to 9.0

Silver (Ag), %		0
Silver (Ag), %		4.0 to 5.0

Zinc (Zn), %		0
Zinc (Zn), %		0.7 to 1.3

Residuals, %		0
Residuals, %		0 to 0.4