Copper (Pure)CW004A (C101) Bar & Sheet

High conductivity pure copper.

C101/CW004A is the designation for the 99.9% pure copper used in a range of engineering applications.

C101/CW004A is also known as HC or high conductivity copper. It has a nominal conductivity of 100% IACS (International Annealed Copper Standard). It also has high thermal conductivity.

This is therefore the material of choice for use in conductors and electrical components but not when the service environment is a reducing atmosphere. It is also very popular with architects for applications where the corrosion resistance is required for building applications. Over time the C101 will also develop the weathered copper, green patina, appearance that offers additional corrosion resistance and a desirable look.

High ductility and impact strength also serve to make C101/CW004A an extremely versatile material.

C101/CW004A is also the base material from which common brasses and bronzes are produced.

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Product FormImperial SizesMetric Sizes
Round Bar HDHC14"4"10mm50mm
Flat Bar HDHC12" x 18"6" x 12"20mm x 5mm200mm x 10mm
Sheet HH- 2m x 1m--0.9mm4.0mm
Sheet HH - 1.2m x 0.6m--1.6mm2.0mm
Sheet HH - 4' x 2'20 swg10swg--
If you do not see what you are looking for, please contact your local service centre with your specific requirements.

Related Specifications

C101/CW004A HC Copper corresponds to the following designations but may not be a direct equivalent:

  • UNS C11000
  • ISO Cu-ETP


Chemical Composition


  • General engineering
  • Cables
  • Electrical conductors, contacts & terminals
  • Busbars
  • Motor and transformer components
  • Automotive and industrial radiators
  • Domestic appliances
  • Cold formed components
  • Architectural metalwork
  • Chemical process equipment
  • Vats, kettles and pans


  • Very High electrical conductivity
  • Excellent formability
  • Very good thermal conductivity
  • Excellent joining characteristics
  • High ductility and impact strength

Additional Information


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