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UNS C50100 Phosphor Bronze

C50100 bronze is a bronze formulated for primary forming into wrought products. Cited properties are appropriate for the O61 (annealed) temper.

It has the highest melting temperature among wrought bronzes. In addition, it has a moderately high electrical conductivity and a fairly low tensile strength.

The graph bars on the material properties cards below compare C50100 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

120 GPa 17 x 106 psi

Elongation at Break

40 %

Poisson's Ratio


Rockwell Superficial 30T Hardness


Shear Modulus

43 GPa 6.2 x 106 psi

Shear Strength

180 MPa 26 x 103 psi

Tensile Strength: Ultimate (UTS)

270 MPa 39 x 103 psi

Tensile Strength: Yield (Proof)

82 MPa 12 x 103 psi

Thermal Properties

Latent Heat of Fusion

210 J/g

Maximum Temperature: Mechanical

200 °C 390 °F

Melting Completion (Liquidus)

1080 °C 1980 °F

Melting Onset (Solidus)

1070 °C 1950 °F

Specific Heat Capacity

380 J/kg-K 0.092 BTU/lb-°F

Thermal Conductivity

230 W/m-K 130 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

55 % IACS

Electrical Conductivity: Equal Weight (Specific)

55 % IACS

Otherwise Unclassified Properties

Base Metal Price

31 % relative


8.9 g/cm3 560 lb/ft3

Embodied Carbon

2.6 kg CO2/kg material

Embodied Energy

42 MJ/kg 18 x 103 BTU/lb

Embodied Water

310 L/kg 37 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

82 MJ/m3

Resilience: Unit (Modulus of Resilience)

29 kJ/m3

Stiffness to Weight: Axial

7.2 points

Stiffness to Weight: Bending

18 points

Strength to Weight: Axial

8.3 points

Strength to Weight: Bending

10 points

Thermal Diffusivity

66 mm2/s

Thermal Shock Resistance

9.5 points

Alloy Composition

Among wrought copper alloys, the composition of C50100 bronze is notable for including phosphorus (P) and tin (Sn). Phosphorus is used as an alloy deoxidizer, and to reduce vulnerability to dezincification. Tin is used to improve strength, bearing properties, and corrosion resistance against certain types of media.

Copper (Cu) 98.6 to 99.49
Tin (Sn) 0.5 to 0.8
Phosphorus (P) 0.010 to 0.050
Iron (Fe) 0 to 0.050
Lead (Pb) 0 to 0.050
Residuals 0 to 0.5

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

Followup Questions

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