Silver Bearing Tough Pitch Copper Alloy UNS C11500

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Other Designations


Copper is one of the most useful metals known to mankind. It has exceptional electrical conductivity and also exhibits high thermal conductivity. Copper and its alloys exhibit a high ultimate tensile strength mainly due to the various heat treatment methods that they are subjected to.

Copper alloy C11500 is referred to as silver bearing tough pitch alloy, and it belongs to the class of wrought copper alloys. It is available in the form of wires, bars, brazing filler metals, strips and sheets. It exhibits good ductility and resistance to annealing.

This datasheet will elaborate on the chemical composition and properties of copper UNS C11500 alloy.

Chemical Composition

The chemical composition of copper alloy UNS C11500 is given in the following table.

Element Content (%)
Copper, Cu 99.9
Silver, Ag 0.054

Physical Properties

The following table discusses the physical properties of copper alloy UNS C11500.

Properties Metric Imperial
Density 8.94 gm/cm3 0.322 lb/in3

Mechanical Properties

The mechanical properties of copper alloy UNS C11500 are tabulated below.

Properties Metric Imperial
Tensile strength 221-455 MPa 32-66 ksi
Yield strength 69-365 MPa 10-53 ksi
Modulus of elasticity 117 GPa 16969 ksi
Poisson’s ratio 0.34 0.34

Other Designations

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Some of the other designations that are used to denote copper UNS C11500 are as below:-

  • ASTM B1
  • ASTM B172
  • ASTM B174
  • ASTM B623
  • SAE J461
  • QQ W343
  • ASTM B355


Machinability: The machinability rating of this alloy is 20.

Welding Methods: Soldering, brazing and butt welding. However, other methods such as oxyacetylene welding, coated metal arc welding and spot welding are not recommended.

Forging - Copper UNS C11500 alloy has good forging ability. The hot forging rating of the alloy is 65. The recommended hot working temperature is 1400 to 1600 F.

Hot working - Copper UNS C11500 alloy has excellent hot working abilities.

Cold working - Copper UNS C11500 alloy has excellent cold working properties.

Annealing: The annealing temperature for this alloy is between 900 and 1400 F.


Copper UNS C11500 is used in the following applications:

  • Automotive – radiator and heat exchanger fins
  • Electrical – terminals, generator coils, windings, bus bars
  • Industrial – clad metals, printing rolls, casting mold.


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