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Sulphur Copper Plate

S & D Non-Ferrous stocks Sulphur Copper plate in CW114C, a free-machining copper with a great, approximately 80% machinability rating. Adding sulphur to copper makes for a ‘free-machining copper’ as the sulphur acts as a chip breaker, making it markedly easier to machine than pure copper and only having a small effect on the conductivity of the metal.

Sulphur Copper’s machining speeds can reach up to 4 times faster than those of pure copper. It has a better tooling life span. Sulphur Copper is a flexible metal as it combines the high thermal and electrical conductivity values that are often seen in pure copper, however, the ease of machining from the sulphur allows it to be used in a greater number of conditions. Other qualities of GRADE have an easy solder ability and decent levels of corrosion resistance.

Our CW114C sulphur copper plates are readily available in a number of other formations, too. Our team will be happy to discuss these with you in further detail, if you are unsure of the exact product you need.

We source all of our sulphur copper plates from UK and European suppliers to make sure our customers only receive top-quality stock that meets industry standards. To find more about our range of sulphur copper sheets, please do not hesitate to contact a member of our knowledgeable S & D team today on 0121 525 5500. 

Services available for our Sulphur Copper Plate CW114C stock

Free Cutting
Custom Lengths
Fast Turnaround
Fast Turnaround

Need Sulphur Copper Plate CW114C in a hurry?

As one of the UK's largest independent metal stockists, we guarantee fast turn around and delivery!


Uses of Sulphur Copper Plate:

  • Electrical Contacts
  • Electrical Connectors
  • Cable Glands
  • Transformers
  • Circuit Breaker Terminals

Industries That Use Sulphur Copper Plate:

  • Electronics
  • Engineering
  • Automotive
  • Aviation

Sulphur Copper Plate Properties







Total Imps

0.1% max





Melting Point



8.94 g/cm³

Specific heat

385 J/Kg °K

Thermal conductivity

347 W/m°K

Thermal expansion coefficient (20-200°C)

17 x 10-6per °C

Electrical conductivity

93% IACS

Electrical resistivity

0.0181 microhm m

Modulus of elasticity

12500 Kg/mm²

Hot Working Temperature Range


Hot Formability


Cold Formability


Cold reduction between anneals

70% max.

Machinability rating (free cutting brass = 100)






Oxy-acetylene welding

Not Recommended

Gas-shielded arc welding

Not Recommended

Resistance welding: Spot and Seam Not Recommended
Butt Fair


Sulphur copper is the addition of sulphur to a standard copper. Pure copper has excellent thermal and electrical conductivity, as well as great ductility and corrosion resistance, but the metal has poor machinability.

When sulphur is introduced to copper, the workability of the metal significantly increases, without having to compromise on the favoured and beneficial aforementioned properties.  Pure copper has a machinability rating of 20%, in contrast to sulphur copper that has an 80% machinability rating.

Sulphur copper has machining speeds that are four times faster than pure copper and since the compound produces a much softer metal, it is less detrimental on tooling and machining components.

Sulphur copper is used in applications that require good corrosion resistance, excellent thermal and electrical conductivity, but also applications that demand easy forming and extensive machining that pure copper is unable to handle.

Some examples of these applications include:

  • Circuit Breakers

  • Electrical Connectors

  • Socket Connectors

  • Laser Nozzles

  • Transistor Bases

  • Relay Parts

  • Electrical Pins

Enquire About Sulphur Copper Plate CW114C Today

To discuss your requirements call S&D Non-Ferrous Stockholders today on 0121 525 5500

Quality Assured

Quality Assured

Why Choose Us?

  • Established for over 30 years
  • Extensive stock range of copper, brass and bronze
  • Same day / next day delivery on stock products
  • No job too big or too small
  • We tailor to your requirements
  • Able to source even unusual requirements

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