C68700 Brass vs. ASTM B628 Ag-Cu

C68700 brass belongs to the copper alloys classification, while ASTM B628 Ag-Cu belongs to the otherwise unclassified metals. 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 C68700 brass and the bottom bar is ASTM B628 Ag-Cu.

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

Metric UnitsUS Customary Units

Mechanical Properties

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

Poisson's Ratio		0.32
Poisson's Ratio		0.36

Shear Modulus, GPa		41
Shear Modulus, GPa		31

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

Thermal Properties

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

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

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

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

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

Electrical Properties

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

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

Otherwise Unclassified Properties

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

Common Calculations

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

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

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

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

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

Alloy Composition

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

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

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

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

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

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

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

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

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

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

Residuals, %		0
Residuals, %		0 to 0.21