C28000 Muntz Metal vs. ASTM B628 Ag-Cu

C28000 Muntz Metal belongs to the copper alloys classification, while ASTM B628 Ag-Cu belongs to the otherwise unclassified metals. They have a modest 28% of their average alloy composition in common, which, by itself, doesn't mean much. There are 19 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is C28000 Muntz Metal and the bottom bar is ASTM B628 Ag-Cu.

UNS C28000 (CW509L) Muntz Metal ASTM B628 Silver-Copper Eutectic Electrical Contact Alloy

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		100
Elastic (Young's, Tensile) Modulus, GPa		83

Elongation at Break, %		10 to 45
Elongation at Break, %		1.1 to 17

Poisson's Ratio		0.31
Poisson's Ratio		0.36

Shear Modulus, GPa		40
Shear Modulus, GPa		31

Shear Strength, MPa		230 to 330
Shear Strength, MPa		210 to 430

Tensile Strength: Ultimate (UTS), MPa		330 to 610
Tensile Strength: Ultimate (UTS), MPa		350 to 760

Thermal Properties

Latent Heat of Fusion, J/g		170
Latent Heat of Fusion, J/g		140

Melting Completion (Liquidus), °C		900
Melting Completion (Liquidus), °C		780

Melting Onset (Solidus), °C		900
Melting Onset (Solidus), °C		780

Specific Heat Capacity, J/kg-K		390
Specific Heat Capacity, J/kg-K		280

Thermal Expansion, µm/m-K		21
Thermal Expansion, µm/m-K		19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS		28
Electrical Conductivity: Equal Volume, % IACS		84

Electrical Conductivity: Equal Weight (Specific), % IACS		31
Electrical Conductivity: Equal Weight (Specific), % IACS		75

Otherwise Unclassified Properties

Density, g/cm³		8.0
Density, g/cm³		10

Common Calculations

Stiffness to Weight: Axial, points		7.2
Stiffness to Weight: Axial, points		4.6

Stiffness to Weight: Bending, points		20
Stiffness to Weight: Bending, points		14

Strength to Weight: Axial, points		11 to 21
Strength to Weight: Axial, points		9.5 to 21

Strength to Weight: Bending, points		13 to 20
Strength to Weight: Bending, points		11 to 18

Thermal Shock Resistance, points		11 to 20
Thermal Shock Resistance, points		16 to 34

Alloy Composition

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

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

Copper (Cu), %		59 to 63
Copper (Cu), %		26.6 to 29

Iron (Fe), %		0 to 0.070
Iron (Fe), %		0 to 0.050

Lead (Pb), %		0 to 0.3
Lead (Pb), %		0 to 0.030

Nickel (Ni), %		0
Nickel (Ni), %		0 to 0.010

Phosphorus (P), %		0
Phosphorus (P), %		0 to 0.030

Silver (Ag), %		0
Silver (Ag), %		71 to 73

Zinc (Zn), %		36.3 to 41
Zinc (Zn), %		0 to 0.060

Residuals, %		0
Residuals, %		0 to 0.21