ASTM B685 Alloy vs. C69710 Brass

ASTM B685 alloy belongs to the otherwise unclassified metals classification, while C69710 brass belongs to the copper alloys. They have 40% of their average alloy composition in common. There are 17 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is ASTM B685 alloy and the bottom bar is C69710 brass.

ASTM B685 Palladium-Copper Electrical Contact Alloy UNS C69710 Leaded Silicon Brass

Metric UnitsUS Customary Units

Mechanical Properties

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

Poisson's Ratio		0.37
Poisson's Ratio		0.32

Shear Modulus, GPa		43
Shear Modulus, GPa		41

Tensile Strength: Ultimate (UTS), MPa		660 to 1060
Tensile Strength: Ultimate (UTS), MPa		470

Thermal Properties

Latent Heat of Fusion, J/g		180
Latent Heat of Fusion, J/g		240

Melting Completion (Liquidus), °C		1230
Melting Completion (Liquidus), °C		930

Melting Onset (Solidus), °C		1200
Melting Onset (Solidus), °C		880

Specific Heat Capacity, J/kg-K		300
Specific Heat Capacity, J/kg-K		400

Thermal Expansion, µm/m-K		14
Thermal Expansion, µm/m-K		19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		5.0
Electrical Conductivity: Equal Volume, % IACS		8.0

Electrical Conductivity: Equal Weight (Specific), % IACS		4.1
Electrical Conductivity: Equal Weight (Specific), % IACS		8.7

Otherwise Unclassified Properties

Density, g/cm³		11
Density, g/cm³		8.3

Common Calculations

Stiffness to Weight: Axial, points		6.1
Stiffness to Weight: Axial, points		7.3

Stiffness to Weight: Bending, points		15
Stiffness to Weight: Bending, points		19

Strength to Weight: Axial, points		17 to 27
Strength to Weight: Axial, points		16

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

Thermal Shock Resistance, points		28 to 46
Thermal Shock Resistance, points		16

Alloy Composition

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

Arsenic (As), %		0
Arsenic (As), %		0.030 to 0.060

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

Copper (Cu), %		39.5 to 40.5
Copper (Cu), %		75 to 80

Iron (Fe), %		0 to 0.050
Iron (Fe), %		0 to 0.2

Lead (Pb), %		0 to 0.030
Lead (Pb), %		0.5 to 1.5

Manganese (Mn), %		0
Manganese (Mn), %		0 to 0.4

Palladium (Pd), %		59 to 60.5
Palladium (Pd), %		0

Silicon (Si), %		0
Silicon (Si), %		2.5 to 3.5

Silver (Ag), %		0 to 0.1
Silver (Ag), %		0

Zinc (Zn), %		0 to 0.060
Zinc (Zn), %		13.8 to 22

Residuals, %		0
Residuals, %		0 to 0.5