Copper and Copper Alloys - Copper (Pure) - NES/DEFSTAN 02-837


This Defence Standard (DEF STAN) 02-837 specifies the requirements for the manufacture, inspection, testing and supply of copper tubes that meet the requirements for phosphorus deoxidised non-arsenical copper conforming to the chemical composition of BS EN 12449:1999, CW024A.

C106 / CW024A is phosphorous de-oxidised non-arsenical copper that is 99.9% pure.

C106 is typically used in applications like:
~ Refrigeration
~ Gutters and roofing
~ Gas plants
~ Hydraulic, air and oil lines
~ Air Conditioning and refrigeration
~ Heater units and burners tubes Consumer
~ Plumbing pipe and fittings

Chemical Composition

Spec: EN 1652:1997


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 391.2 W/m.K
Electrical Resistivity 0.0203 x10^-6 Ω .m

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

Alloy Designations

C106/CW024A Copper corresponds to the following designations but may not be a direct equivalent:

UNS C12200


Supplied Forms

C106/CW024A is typically supplied as Round tube, Half Hard Sheet and Soft Sheet.

  • Sheet
  • Tube
  • Plate

Corrosion Resistance

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

Cold Working

C106 / CW024A has an excellent response to cold working.

Hot Working

With forging of brass rated as 100, the hot forgeability of C106 / CW024A is rated at 65. Hot working temperatures should be between 760 and 870°C

Heat Treatment

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


This alloy has a machinability rating of 20 when Brass CZ121 / CW614N is 100.


Deoxidation of C106 / CW024A improves embrittlement resistance during welding.

Brazing and soldering are both excellent joining methods for C106 / CW024A. Gas shielded arc welding is also excellent. Oxyacetylene welding and butt welding are good. Welding methods not recommended include:

~ Coated metal arc welding

~ Spot welding

~ Seam welding

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Last Datasheet Revision

22 July 2016


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.

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