ASTM B685 Alloy vs. ZA-12

ASTM B685 alloy belongs to the otherwise unclassified metals classification, while ZA-12 belongs to the zinc alloys. There are 17 material properties with values for both materials. Properties with values for just one material (19, in this case) are not shown.

For each property being compared, the top bar is ASTM B685 alloy and the bottom bar is ZA-12.

ASTM B685 Palladium-Copper Electrical Contact Alloy Zinc-Aluminum 12 (ZA-12, Z35631)

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		120
Elastic (Young's, Tensile) Modulus, GPa		83

Poisson's Ratio		0.37
Poisson's Ratio		0.26

Shear Modulus, GPa		43
Shear Modulus, GPa		33

Tensile Strength: Ultimate (UTS), MPa		660 to 1060
Tensile Strength: Ultimate (UTS), MPa		260 to 400

Thermal Properties

Latent Heat of Fusion, J/g		180
Latent Heat of Fusion, J/g		120

Melting Completion (Liquidus), °C		1230
Melting Completion (Liquidus), °C		430

Melting Onset (Solidus), °C		1200
Melting Onset (Solidus), °C		380

Specific Heat Capacity, J/kg-K		300
Specific Heat Capacity, J/kg-K		450

Thermal Expansion, µm/m-K		14
Thermal Expansion, µm/m-K		24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		5.0
Electrical Conductivity: Equal Volume, % IACS		28

Electrical Conductivity: Equal Weight (Specific), % IACS		4.1
Electrical Conductivity: Equal Weight (Specific), % IACS		42

Otherwise Unclassified Properties

Density, g/cm³		11
Density, g/cm³		6.0

Common Calculations

Stiffness to Weight: Axial, points		6.1
Stiffness to Weight: Axial, points		7.6

Stiffness to Weight: Bending, points		15
Stiffness to Weight: Bending, points		24

Strength to Weight: Axial, points		17 to 27
Strength to Weight: Axial, points		12 to 19

Strength to Weight: Bending, points		16 to 21
Strength to Weight: Bending, points		15 to 20

Thermal Shock Resistance, points		28 to 46
Thermal Shock Resistance, points		9.4 to 14

Alloy Composition

Aluminum (Al), %		0 to 0.0050
Aluminum (Al), %		10.5 to 11.5

Cadmium (Cd), %		0 to 0.050
Cadmium (Cd), %		0 to 0.0060

Copper (Cu), %		39.5 to 40.5
Copper (Cu), %		0.5 to 1.2

Iron (Fe), %		0 to 0.050
Iron (Fe), %		0 to 0.075

Lead (Pb), %		0 to 0.030
Lead (Pb), %		0 to 0.0060

Magnesium (Mg), %		0
Magnesium (Mg), %		0.015 to 0.030

Nickel (Ni), %		0
Nickel (Ni), %		0 to 0.020

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

Silicon (Si), %		0
Silicon (Si), %		0 to 0.060

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

Tin (Sn), %		0
Tin (Sn), %		0 to 0.0030

Zinc (Zn), %		0 to 0.060
Zinc (Zn), %		87.1 to 89

Residuals, %		0 to 0.2
Residuals, %		0