Copper (UNS C12300)

Topics Covered

Chemical Composition
Physical Properties
Other Designations


The Unified Numbering System (UNS) is the conventional alloy designation system used in North America for wrought and cast copper and copper alloy products. UNS C12300 is a phosphorized, silver bearing copper alloy. It is a wrought alloy.

The following datasheet discusses the chemical composition and properties of copper UNS C12300.

Chemical Composition

The chemical composition of copper UNS C12300 is given in the following table.

Element Content (%)
Copper, Cu + Silver, Ag Balance
Phosphorus, P 0.015 - 0.04

Physical Properties

The following table discusses the physical properties of copper UNS C12300.

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

Other Designations

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Other designations that are equivalent to copper UNS C12300 include:

  • ASME SB152
  • ASTM B152
  • ASTM B224
  • ASTM B442
  • ASTM B5
  • ASTM B506
  • ASTM B623


Copper UNS C12300 can be fabricated using many techniques such as coining, knurling, drawing and upsetting, bending, hot forging and pressing, shearing, swaging, roll threading, spinning, and stamping. This alloy can be cold and hot worked readily. It can also be forged.


Copper UNS C12300 finds application in:

  • Rectifiers
  • Vacuum seals
  • Klystrons
  • Transistor components
  • Glass-to-metal seals
  • Waveguides
  • Bus bars and bus conductors
  • Hollow conductors
  • Coaxial cables and microwave tubes
  • Lead-in wires and anodes for vacuum tubes

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