C101 / CW004A / ETP Copper

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Electrolytic Tough Pitch Copper (ETP)  C101 / CW004A is a commercially pure high conductivity grade of copper refined by electrolytic deposition which is then melted and oxidised to the “tough pitch” condition with a controlled low oxygen content. This is the most widely used of all the coppers because of its combination of electrical and thermal conductivity, corrosion resistance, workability and aesthetic beauty.

C101 / CW004A is the normal grade for general electrical use as busbar, motor and transformer components, windings and many other current carrying applications. 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.  

The use of this alloy in elevated temperature environments can be limited due to oxygen being present in the form of Cu2O. This can cause the alloy to be susceptible to hydrogen embrittlement in reducing gasses or when welding or brazing using an oxy-fuel gas flame.

Chemical Composition

Copper                            

99.90 min

Oxygen                  

0.005 – 0.040

Total Imps

0.03% max (excl. O2 & Ag)

Related Specifications

C101

CW004A

BS1433

C11000 ETP

Cu-ETP

DIN 2.0060

Key Features

  • Very High Electrical Conductivity 
  • Excellent formability
  • Very Good Thermal Conductivity
  • Excellent Joining Characteristics

 Typical Physical Properties

Melting Point  

1083°C

Density

8.92 g/cm³

Specific heat

385 J/Kg °K

Thermal conductivity

393 W/m°K

Thermal expansion coefficient  (20-200°C)

17.3 x 10-6 Per °C

Electrical conductivity

100 % IACS

Electrical Resistivity  

0.0172 x10-6 microhm /m 

Modulus of elasticity

118000 N/mm²

Fabrication Properties

Hot Working Temperature Range

750-950°C

Hot Formability

Good

Cold Formability

Excellent

Cold reduction between anneals

90% max

Machinability rating

(free cutting brass = 100)            

20%

Annealing Temp. Range

200-650°C

Stress Relieving Temp. Range

150-200°C

Joining Methods

Soldering

Excellent

Brazing

Good

Oxy-acetylene welding

Less Suitable

Gas-shielded arc welding

Fair

Resistance welding:   spot and seam
                               butt

Not Recomended


Good  

Typical Uses:

The C101 / CW004A is mostly utilised for general electrical busbar, motor and transformer components, windings, electrical conductors, contacts, terminals and many other current carrying applications. Other uses include architectural metalwork, gutters, flashing, roofing, automotive and industrial radiators, together with chemical process equipment, vats, kettles and pans.


This technical information is given by Holme Dodsworth Metals without charge and the user shall employ such information at their own discretion and risk. For more detailed technical advice on temper selection, fabrication, joining, machining, physical and mechanical data please contact us as space does not permit the listing of every feature of the material.

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Holme Dodsworth Metals Limited.
59/69 Heaton Park Road.
Newcastle Upon Tyne NE6 1SQ
Registered in England. Company No. 00842702