C68000 Brass vs. ASTM B685 Alloy

C68000 brass belongs to the copper alloys classification, while ASTM B685 alloy belongs to the otherwise unclassified metals. They have 40% of their average alloy composition in common. There are 15 material properties with values for both materials. Properties with values for just one material (14, in this case) are not shown.

For each property being compared, the top bar is C68000 brass and the bottom bar is ASTM B685 alloy.

UNS C68000 (RBCuZn-B) Filler Metal ASTM B685 Palladium-Copper Electrical Contact Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		100
Elastic (Young's, Tensile) Modulus, GPa		120

Poisson's Ratio		0.3
Poisson's Ratio		0.37

Shear Modulus, GPa		40
Shear Modulus, GPa		43

Tensile Strength: Ultimate (UTS), MPa		390
Tensile Strength: Ultimate (UTS), MPa		660 to 1060

Thermal Properties

Latent Heat of Fusion, J/g		170
Latent Heat of Fusion, J/g		180

Melting Completion (Liquidus), °C		880
Melting Completion (Liquidus), °C		1230

Melting Onset (Solidus), °C		870
Melting Onset (Solidus), °C		1200

Specific Heat Capacity, J/kg-K		390
Specific Heat Capacity, J/kg-K		300

Thermal Expansion, µm/m-K		21
Thermal Expansion, µm/m-K		14

Otherwise Unclassified Properties

Density, g/cm³		8.0
Density, g/cm³		11

Common Calculations

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

Stiffness to Weight: Bending, points		20
Stiffness to Weight: Bending, points		15

Strength to Weight: Axial, points		14
Strength to Weight: Axial, points		17 to 27

Strength to Weight: Bending, points		15
Strength to Weight: Bending, points		16 to 21

Thermal Shock Resistance, points		13
Thermal Shock Resistance, points		28 to 46

Alloy Composition

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Aluminum (Al), %		0 to 0.010
Aluminum (Al), %		0 to 0.0050

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

Copper (Cu), %		56 to 60
Copper (Cu), %		39.5 to 40.5

Iron (Fe), %		0.25 to 1.3
Iron (Fe), %		0 to 0.050

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

Manganese (Mn), %		0.010 to 0.5
Manganese (Mn), %		0

Nickel (Ni), %		0.2 to 0.8
Nickel (Ni), %		0

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

Silicon (Si), %		0.040 to 0.15
Silicon (Si), %		0

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

Tin (Sn), %		0.75 to 1.1
Tin (Sn), %		0

Zinc (Zn), %		35.6 to 42.8
Zinc (Zn), %		0 to 0.060

Residuals, %		0 to 0.5
Residuals, %		0 to 0.2