UNS C18700 (CW113C) Leaded Copper
C18700 copper is a lightly alloyed grade of copper, formulated for primary forming into wrought products. CW113C is the EN numeric designation for this material. C18700 is the UNS number. Additionally, the EN chemical designation is CuPb1P.
It has a moderately low melting temperature among wrought coppers. In addition, it can have a moderately low tensile strength and a moderately low ductility.
The properties of C18700 copper include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C18700 copper to: wrought coppers (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
9.0 to 9.6 %
Poisson's Ratio
0.34
Shear Modulus
43 GPa 6.2 x 106 psi
Shear Strength
170 to 190 MPa 25 to 28 x 103 psi
Tensile Strength: Ultimate (UTS)
290 to 330 MPa 42 to 47 x 103 psi
Tensile Strength: Yield (Proof)
230 to 250 MPa 34 to 37 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)
950 °C 1750 °F
Specific Heat Capacity
380 J/kg-K 0.091 BTU/lb-°F
Thermal Conductivity
380 W/m-K 220 BTU/h-ft-°F
Thermal Expansion
17 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
98 % IACS
Electrical Conductivity: Equal Weight (Specific)
99 % IACS
Otherwise Unclassified Properties
Base Metal Price
30 % relative
Density
9.0 g/cm3 560 lb/ft3
Embodied Carbon
2.6 kg CO2/kg material
Embodied Energy
41 MJ/kg 18 x 103 BTU/lb
Embodied Water
310 L/kg 37 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
24 to 29 MJ/m3
Resilience: Unit (Modulus of Resilience)
240 to 280 kJ/m3
Stiffness to Weight: Axial
7.1 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
9.0 to 10 points
Strength to Weight: Bending
11 to 12 points
Thermal Diffusivity
110 mm2/s
Thermal Shock Resistance
10 to 12 points
Alloy Composition
Among wrought copper alloys, the composition of C18700 copper is notable for containing a comparatively high amount of lead (Pb). Lead is used to improve machinability and bearing properties, at the cost of toxicity.
| Cu | 98 to 99.2 | |
| Pb | 0.8 to 1.5 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B301: Standard Specification for Free-Cutting Copper Rod, Bar, Wire, and Shapes
Copper Alloys: Preparation, Properties and Applications, Michael Naboka and Jennifer Giordano (editors), 2013
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001