ASTM B685 Alloy vs. C66300 Brass

ASTM B685 alloy belongs to the otherwise unclassified metals classification, while C66300 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 C66300 brass.

ASTM B685 Palladium-Copper Electrical Contact Alloy UNS C66300 Tin 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		0.33

Shear Modulus, GPa		43
Shear Modulus, GPa		42

Tensile Strength: Ultimate (UTS), MPa		660 to 1060
Tensile Strength: Ultimate (UTS), MPa		460 to 810

Thermal Properties

Latent Heat of Fusion, J/g		180
Latent Heat of Fusion, J/g		200

Melting Completion (Liquidus), °C		1230
Melting Completion (Liquidus), °C		1050

Melting Onset (Solidus), °C		1200
Melting Onset (Solidus), °C		1000

Specific Heat Capacity, J/kg-K		300
Specific Heat Capacity, J/kg-K		380

Thermal Expansion, µm/m-K		14
Thermal Expansion, µm/m-K		18

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		5.0
Electrical Conductivity: Equal Volume, % IACS		25

Electrical Conductivity: Equal Weight (Specific), % IACS		4.1
Electrical Conductivity: Equal Weight (Specific), % IACS		26

Otherwise Unclassified Properties

Density, g/cm³		11
Density, g/cm³		8.6

Common Calculations

Stiffness to Weight: Axial, points		6.1
Stiffness to Weight: Axial, points		7.2

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		15 to 26

Strength to Weight: Bending, points		16 to 21
Strength to Weight: Bending, points		15 to 22

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

Alloy Composition

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

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

Cobalt (Co), %		0
Cobalt (Co), %		0 to 0.2

Copper (Cu), %		39.5 to 40.5
Copper (Cu), %		84.5 to 87.5

Iron (Fe), %		0 to 0.050
Iron (Fe), %		1.4 to 2.4

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

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

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.35

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

Tin (Sn), %		0
Tin (Sn), %		1.5 to 3.0

Zinc (Zn), %		0 to 0.060
Zinc (Zn), %		6.0 to 12.8

Residuals, %		0
Residuals, %		0 to 0.5