ASTM B617 Coin Silver vs. C70250 Copper

ASTM B617 coin silver belongs to the otherwise unclassified metals classification, while C70250 copper belongs to the copper alloys. There are 17 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is ASTM B617 coin silver and the bottom bar is C70250 copper.

ASTM B617 Coin Silver Electrical Contact Alloy UNS C70250 (CW112C) Nickel-Silicon Copper

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		75
Elastic (Young's, Tensile) Modulus, GPa		120

Poisson's Ratio		0.37
Poisson's Ratio		0.34

Shear Modulus, GPa		28
Shear Modulus, GPa		44

Tensile Strength: Ultimate (UTS), MPa		290 to 520
Tensile Strength: Ultimate (UTS), MPa		520 to 740

Thermal Properties

Latent Heat of Fusion, J/g		120
Latent Heat of Fusion, J/g		220

Melting Completion (Liquidus), °C		870
Melting Completion (Liquidus), °C		1100

Melting Onset (Solidus), °C		780
Melting Onset (Solidus), °C		1080

Specific Heat Capacity, J/kg-K		250
Specific Heat Capacity, J/kg-K		390

Thermal Expansion, µm/m-K		19
Thermal Expansion, µm/m-K		17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		83
Electrical Conductivity: Equal Volume, % IACS		36 to 50

Electrical Conductivity: Equal Weight (Specific), % IACS		72
Electrical Conductivity: Equal Weight (Specific), % IACS		37 to 51

Otherwise Unclassified Properties

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

Common Calculations

Stiffness to Weight: Axial, points		4.1
Stiffness to Weight: Axial, points		7.4

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

Strength to Weight: Axial, points		7.7 to 14
Strength to Weight: Axial, points		16 to 23

Strength to Weight: Bending, points		9.3 to 14
Strength to Weight: Bending, points		16 to 21

Thermal Shock Resistance, points		14 to 25
Thermal Shock Resistance, points		18 to 26

Alloy Composition

Aluminum (Al), %		0 to 0.0050
Aluminum (Al), %		0

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

Copper (Cu), %		9.0 to 10.4
Copper (Cu), %		92.7 to 97.5

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

Lead (Pb), %		0 to 0.030
Lead (Pb), %		0 to 0.050

Magnesium (Mg), %		0
Magnesium (Mg), %		0.050 to 0.3

Manganese (Mn), %		0
Manganese (Mn), %		0 to 0.1

Nickel (Ni), %		0 to 0.010
Nickel (Ni), %		2.2 to 4.2

Phosphorus (P), %		0 to 0.020
Phosphorus (P), %		0

Silicon (Si), %		0
Silicon (Si), %		0.25 to 1.2

Silver (Ag), %		89.6 to 91
Silver (Ag), %		0

Zinc (Zn), %		0 to 0.060
Zinc (Zn), %		0 to 1.0

Residuals, %		0
Residuals, %		0 to 0.5