C55281 Copper vs. C68000 Brass

Both C55281 copper and C68000 brass are copper alloys. Both are furnished in the as-fabricated (no temper or treatment) condition. They have 58% of their average alloy composition in common. There are 19 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.

For each property being compared, the top bar is C55281 copper and the bottom bar is C68000 brass.

UNS C55281 (BCuP-3) Filler Metal UNS C68000 (RBCuZn-B) Filler Metal

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa		110
Elastic (Young's, Tensile) Modulus, GPa		100

Poisson's Ratio		0.34
Poisson's Ratio		0.3

Shear Modulus, GPa		40
Shear Modulus, GPa		40

Tensile Strength: Ultimate (UTS), MPa		190
Tensile Strength: Ultimate (UTS), MPa		390

Thermal Properties

Brazing Temperature, °C		720 to 820
Brazing Temperature, °C		880 to 980

Latent Heat of Fusion, J/g		190
Latent Heat of Fusion, J/g		170

Maximum Temperature: Mechanical, °C		200
Maximum Temperature: Mechanical, °C		120

Melting Completion (Liquidus), °C		810
Melting Completion (Liquidus), °C		880

Melting Onset (Solidus), °C		640
Melting Onset (Solidus), °C		870

Specific Heat Capacity, J/kg-K		400
Specific Heat Capacity, J/kg-K		390

Thermal Expansion, µm/m-K		16
Thermal Expansion, µm/m-K		21

Otherwise Unclassified Properties

Density, g/cm³		8.7
Density, g/cm³		8.0

Embodied Carbon, kg CO₂/kg material		7.0
Embodied Carbon, kg CO₂/kg material		2.8

Embodied Energy, MJ/kg		110
Embodied Energy, MJ/kg		48

Common Calculations

Stiffness to Weight: Axial, points		6.9
Stiffness to Weight: Axial, points		7.3

Stiffness to Weight: Bending, points		18
Stiffness to Weight: Bending, points		20

Strength to Weight: Axial, points		6.1
Strength to Weight: Axial, points		14

Strength to Weight: Bending, points		8.5
Strength to Weight: Bending, points		15

Thermal Shock Resistance, points		7.7
Thermal Shock Resistance, points		13

Alloy Composition

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

Copper (Cu), %		88.5 to 89.4
Copper (Cu), %		56 to 60

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

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

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

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

Phosphorus (P), %		5.8 to 6.2
Phosphorus (P), %		0

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

Silver (Ag), %		4.8 to 5.2
Silver (Ag), %		0

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

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

Residuals, %		0
Residuals, %		0 to 0.5