Copper and Copper Alloys - Copper (Pure) - CW004A Sheet, Plate and Bar

CW004A Sheet, Plate and Bar

It is believed that Copper has been mined for over 5000 years. It can be found in elemental form and in the minerals cuprite, malachite, azurite, chalcopyrite and bornite. Copper is also often found as a by-product of silver production.
Next to Silver, Copper is the next best conductor of electricity. It has a yellowish/gold colour that can be polished to a bright metallic lustre. It is tough, ductile and malleable. Copper has a disagreeable taste and a peculiar smell.
Copper is resistant to corrosion in most atmospheres including marine and industrial environments. It is corroded by oxidising acids, halogens, sulphides and ammonia based solutions.
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.
High ductility and impact strength also serve to make C101/CW004A an extremely useful material.
C101/CW004A is also the base material from which common brasses and bronzes are produced.

Applications - C101/CW004A is typically used in:
~ General engineering
~ Electronics
~ Busbars
~ Automotive
~ Domestic Appliances
~ Cold formed components

Chemical Composition

Spec: EN 1652:1997 /EN13601


Chemical Element % Present
Others (Total) 0.0 - 0.10
Copper (Cu) Balance


Physical PropertyValue
Density 8.92 g/cm³
Melting Point 1083 °C
Thermal Expansion 16.9 x10^-6 /K
Modulus of Elasticity 117 GPa
Thermal Conductivity 391.1 W/m.K
Electrical Resistivity 0.0171 x10^-6 Ω .m
Electrical Resistivity 100 % IACS

Spec: EN 1652:1997

Sheet - 0.2mm to 15mm Thick

Mechanical PropertyValue
Proof Stress 50-340 MPa
Tensile Strength 200-360 MPa
Elongation A50 mm 50-5 %
Hardness Vickers 40 to 110 HV

Spec: EN 13601

Bar - 2 to 80mm Dia./ A/f

Mechanical PropertyValue

Alloy Designations

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

UNS C11000


Supplied Forms

C1101/CW004A HC Copper is typically supplied as flat bar, round bar and half hard sheet

  • Bar
  • Sheet
  • Plate

Corrosion Resistance

Corrosion resistance is either good or excellent in most environments and atmospheres other than those containing ammonia ions.

Cold Working

C101/CW004A can be readily cold worked. When in the annealed condition, it can be readily bent to shape and has excellent ductility.

It work hardens relatively slowly and can be annealed in neutral or oxidising atmospheres.

Hot Working

C101/CW004A is very readily hot worked.

Heat Treatment

Solution treatment or annealing can be done by rapid cooling after heating to 370-650°C.


C101/CW004A has a machinability rating of 20 where Brass CZ121/CW614N is 100.


Soldering of C101/CW004A is excellent. Brazability and butt welding are also rated as good. Gas shielded arc welding has a fair rating. All other welding processes are not recommended.

Datasheet Search

Last Datasheet Revision

18 July 2019


This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.

Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied.

Advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. All transactions are subject to the Company’s current Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.