ASTM B628 Ag-Cu vs. C68700 Brass

ASTM B628 Ag-Cu belongs to the otherwise unclassified metals classification, while C68700 brass belongs to the copper alloys. They have a modest 28% 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 (11, in this case) are not shown.

For each property being compared, the top bar is ASTM B628 Ag-Cu and the bottom bar is C68700 brass.

ASTM B628 Silver-Copper Eutectic Electrical Contact Alloy UNS C68700 (CW702R) Aluminum Brass

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		83
Elastic (Young's, Tensile) Modulus, GPa		110

Poisson's Ratio		0.36
Poisson's Ratio		0.32

Shear Modulus, GPa		31
Shear Modulus, GPa		41

Tensile Strength: Ultimate (UTS), MPa		350 to 760
Tensile Strength: Ultimate (UTS), MPa		390

Thermal Properties

Latent Heat of Fusion, J/g		140
Latent Heat of Fusion, J/g		190

Melting Completion (Liquidus), °C		780
Melting Completion (Liquidus), °C		970

Melting Onset (Solidus), °C		780
Melting Onset (Solidus), °C		930

Specific Heat Capacity, J/kg-K		280
Specific Heat Capacity, J/kg-K		400

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		84
Electrical Conductivity: Equal Volume, % IACS		23

Electrical Conductivity: Equal Weight (Specific), % IACS		75
Electrical Conductivity: Equal Weight (Specific), % IACS		25

Otherwise Unclassified Properties

Density, g/cm³		10
Density, g/cm³		8.3

Common Calculations

Stiffness to Weight: Axial, points		4.6
Stiffness to Weight: Axial, points		7.3

Stiffness to Weight: Bending, points		14
Stiffness to Weight: Bending, points		19

Strength to Weight: Axial, points		9.5 to 21
Strength to Weight: Axial, points		13

Strength to Weight: Bending, points		11 to 18
Strength to Weight: Bending, points		14

Thermal Shock Resistance, points		16 to 34
Thermal Shock Resistance, points		13

Alloy Composition

Aluminum (Al), %		0 to 0.0050
Aluminum (Al), %		1.8 to 2.5

Arsenic (As), %		0
Arsenic (As), %		0.020 to 0.1

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

Copper (Cu), %		26.6 to 29
Copper (Cu), %		76 to 79

Iron (Fe), %		0 to 0.050
Iron (Fe), %		0 to 0.060

Lead (Pb), %		0 to 0.030
Lead (Pb), %		0 to 0.070

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

Phosphorus (P), %		0 to 0.030
Phosphorus (P), %		0

Silver (Ag), %		71 to 73
Silver (Ag), %		0

Zinc (Zn), %		0 to 0.060
Zinc (Zn), %		17.8 to 22.2

Residuals, %		0
Residuals, %		0 to 0.5