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UNS C40500 Penny Bronze

C40500 penny bronze is a bronze formulated for primary forming into wrought products. It can have a moderately low tensile strength among wrought bronzes. In addition, it has a moderately high electrical conductivity and a moderately high thermal conductivity.

The properties of C40500 penny bronze include nine common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C40500 penny bronze to: wrought bronzes (top), all copper alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elastic (Young's, Tensile) Modulus

110 GPa 17 x 106 psi

Elongation at Break

3.0 to 49 %

Poisson's Ratio


Rockwell B Hardness

46 to 82

Rockwell Superficial 30T Hardness

10 to 72

Shear Modulus

43 GPa 6.2 x 106 psi

Shear Strength

210 to 310 MPa 31 to 45 x 103 psi

Tensile Strength: Ultimate (UTS)

270 to 540 MPa 39 to 78 x 103 psi

Tensile Strength: Yield (Proof)

79 to 520 MPa 12 to 76 x 103 psi

Thermal Properties

Latent Heat of Fusion

200 J/g

Maximum Temperature: Mechanical

190 °C 370 °F

Melting Completion (Liquidus)

1060 °C 1940 °F

Melting Onset (Solidus)

1020 °C 1880 °F

Specific Heat Capacity

380 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

160 W/m-K 95 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

41 % IACS

Electrical Conductivity: Equal Weight (Specific)

42 % IACS

Otherwise Unclassified Properties

Base Metal Price

30 % relative


8.8 g/cm3 550 lb/ft3

Embodied Carbon

2.7 kg CO2/kg material

Embodied Energy

43 MJ/kg 19 x 103 BTU/lb

Embodied Water

320 L/kg 38 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

16 to 110 MJ/m3

Resilience: Unit (Modulus of Resilience)

28 to 1200 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

8.5 to 17 points

Strength to Weight: Bending

10 to 17 points

Thermal Diffusivity

48 mm2/s

Thermal Shock Resistance

9.5 to 19 points

Alloy Composition

Among wrought copper alloys, the composition of C40500 penny bronze is notable for including tin (Sn). Tin is used to improve strength, bearing properties, and corrosion resistance against certain types of media.

Copper (Cu)Cu 94 to 96
Zinc (Zn)Zn 2.1 to 5.3
Tin (Sn)Sn 0.7 to 1.3
Iron (Fe)Fe 0 to 0.050
Lead (Pb)Pb 0 to 0.050
Residualsres. 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993