Tough Pitch with Silver Copper Alloy (UNS C11700)

Topics Covered

Chemical Composition
Physical Properties
Other Designations


Copper and its alloys are extremely good thermal and electrical conductors. Resistance to corrosion is another important characteristic of copper and its alloys. The nature and amount of the impurities determines the applications of copper alloys. Oxygen-free copper alloys are known for their high ductility.

Copper alloy C11700 is referred to as a tough pitch with silver copper. It is available in the form of brazen filler metal. This alloy is registered with the US EPA as an anti-microbial. This alloy exhibits excellent resistance to corrosion from atmospheric elements, brackish or sea water.

This datasheet will elaborate on the chemical composition and properties of copper UNS C11700 alloy.

Chemical Composition

The chemical composition of copper UNS C11700 is given in the following table.

Element Content (%)
Copper, Cu + Silver, Ag 99.9
Boron, B 0.004- 0.02
Phosphorus, P 0.04 max

Physical Properties

The following table lists the physical properties of copper UNS C11700.

Properties Metric Imperial
Density 8.9 gm/cm3 0.323 lb/in3

Other Designations

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Some of the other designations that are used to denote copper UNS C11700 are as below:

  • FEDERAL QQ-B650. 


Some of the methods adopted for fabricating this alloy are coining, bending, coppersmith, upsetting and drawing. Other methods of fabrication are knurling, roll threading, spinning, swaging and stamping.

Forging - Copper UNS C11700 alloy has good forging ability.

Hot working - Copper UNS C11700 alloy has excellent hot working abilities.

Cold working - Copper UNS C11700 alloy has excellent cold working properties.


Copper UNS C11700 is used in the following applications:

  • Bus bars, bus conductors, lead-wires, hollow conductors
  • Vacuum tubes, vacuum seals
  • Transistor components
  • Coaxial cables, klystrons
  • Microwave tubes and rectifiers.


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