ASTM B685 Alloy vs. C68100 Brass

ASTM B685 alloy belongs to the otherwise unclassified metals classification, while C68100 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 C68100 brass.

ASTM B685 Palladium-Copper Electrical Contact Alloy UNS C68100 (RBCuZn-C) Filler Metal

Metric UnitsUS Customary Units

Mechanical Properties

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

Poisson's Ratio		0.37
Poisson's Ratio		0.3

Shear Modulus, GPa		43
Shear Modulus, GPa		40

Tensile Strength: Ultimate (UTS), MPa		660 to 1060
Tensile Strength: Ultimate (UTS), MPa		380

Thermal Properties

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

Melting Completion (Liquidus), °C		1230
Melting Completion (Liquidus), °C		890

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

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

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

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		5.0
Electrical Conductivity: Equal Volume, % IACS		24

Electrical Conductivity: Equal Weight (Specific), % IACS		4.1
Electrical Conductivity: Equal Weight (Specific), % IACS		27

Otherwise Unclassified Properties

Density, g/cm³		11
Density, g/cm³		7.9

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		20

Strength to Weight: Axial, points		17 to 27
Strength to Weight: Axial, points		13

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

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

Alloy Composition

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

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

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

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

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

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

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

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

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

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

Zinc (Zn), %		0 to 0.060
Zinc (Zn), %		36.4 to 43

Residuals, %		0
Residuals, %		0 to 0.5