Conductive Copper Wire
Copper Wire Stock & Service Centre
Available Grades:
CU-ETP | CW004A | C11000 | C101
CU-ETP1 | CW003A
CU-OF | CW008A | C10300 | C103
Available in wire
Conductive Copper Wire: Precision Solutions for High-Conductivity Applications
High-performance conductive copper wire is designed for use in demanding electrical and electronic applications. Applications requiring conductive wire typically use commercially pure high-content copper alloys. These copper grades provide exceptional conductivity, formability, and purity,
The Knight Group is a copper alloy stock and service centre providing a comprehensive range of precision alloy wire, including oxygen-free copper (OFHC) and electrolytic tough-pitch (ETP) copper grades, ideal for electrical applications. As precision wire specialists with one of the most extensive wire production facilities in Europe, we can supply conductive wire tailored to meet your project requirements.
Our Conductive Copper Wire Range
We supply three primary conductive copper grades, each offering specific advantages depending on your technical and environmental requirements:
Cu-ETP / CW004A / C11000 / C101
Cu-HCP / CW021A / C10300 / C102
Cu-ETP1 / CW003A
We supply a comprehensive range of copper alloys for a variety of applications.
High Content Copper
Brass
Phosphur Bronze
Nickel Silver
Cupronickel
Beryllium Copper
Enamelled Copper
Conductive Copper Wire​
Conductive Copper wire is an excellent solution for creating a more conductive or efficient connection between two points. It has the highest conductivity of any non-precious metal and is ideal for use in electrical applications due to its durability and high performance. Conductive copper wire is also known as “fine silver” or even “white gold” because of its silver appearance. The most common form of copper is high conductivity copper, which is widely available in high quality.
The most common form of copper is high conductivity copper, which is widely available in high quality. This grade of copper is Electrolytic Tough Pitch (Cu-ETP), which has a 100% IACS.
For specific applications, oxygen free copper (Cu-OF) is available which prevents embrittlement and material cracking. Additionally, if increased strength is required, alloying elements such as tin, magnesium, chromium and iron can be added in small quantities. These alloys increase the strength but reduce conductivity.
As part of the Knight Group Knight Precision Wire are specialist manufacturers of Wire and Cable and can provide free quotations on your requirements. Please get in touch to arrange this.
High Conductivity Copper (Cu-ETP) & Oxygen Free Copper (Cu-OF)
High Conductivity Copper (Cu-ETP)
Electrolytic Tough Pitch high conductivity copper is the standard grade of copper for electrical conductivity applications, with 100% IACS. A higher grade Cu-ETP1 is made from Grade A copper cathode.
Oxygen Free Copper (Cu-OF)
For special welding and brazing applications, an oxygen free copper is available with 102% IACS. This copper avoids embrittlement in a heated reducing environment as hydrogen reacts with the oxide in the metal to form steam and material cracking.
Conductive Copper Alloy Properties
| CONDUCTIVE COPPER ALLOYS GRADE DESIGNATIONS & CHEMICAL COMPOSITIONS (% BY WEIGHT) | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MATERIAL DESIGNATION EN1652 or Alloy | NEAREST FIT | TYPICAL CHEMICAL COMPOSITION % | |||||||||||||
| Symbol/ Name | Number | UNS | BS 2870 | Cu | Be | Co | Fe | Mn | Ni | P | Pb | Sn | Zn | Others | Impurities |
| HIGH CONDUCTIVITY COPPERS | |||||||||||||||
| Cu-ETP | CW004A | C11000 | C101 | 99.9 min | - | - | - | - | - | - | 0.005 | - | - | Bi: 0.0005 O: 0.04 | - |
| Cu-ETP1 | CW003A | C11040 | - | Available by Request | |||||||||||
| Cu-OF | CW008A | C10200 | C103 | 99.95 min | - | - | - | - | - | - | 0.005 | - | - | Bi: 0.0005 | 0.03 |
| MECHANICAL PROPERTIES FOR COPPER SPECIFICALLY USED IN ELECTRICAL CONDUCTOR APPLICATIONS | ||||||||
|---|---|---|---|---|---|---|---|---|
| Material Designation BS EN 13602:2013 | Nearest equivalent | Material Condition | UTS Nominal Rm N/mm² | % Elongation 200mm | Conductivity | |||
| Symbol | Number | UNS | BS 4109 | Single Wire | Multi Line | % IACS | ||
| Cu-ETP | CW004A | C10100 | C101 | Annealed | 200 | 10 to 33 | 8 to 26 | 100 |
| Cu-OF | CW008A | C10300 | C103 | |||||
| Cu-ETP* | CW004A | C10100 | C101 | Annealed | 200 | 5 to 31 | 5 to 22 | 92.6 to 99.0 |
| Cu-OF* | CW008A | C10300 | C103 | |||||
| Cu-ETP | CW004A | C10100 | C101 | Hard Drawn | 360 to 460 | - | - | 93.4 to 97.1 |
| Cu-OF | CW008A | C10300 | C103 | |||||
| Cu-ETP* | CW004A | C10100 | C101 | Hard Drawn | 360 to 460 | - | - | - to 96.2 |
| Cu-OF* | CW008A | C10300 | C103 | |||||
| Cu-ETP1 | CW003A | C11040 | - | Available by Request | ||||
Conductive Copper Characteristics and Industrial applications
| CONDUCTIVE COPPER ALLOY FEATURES AND APPLICATIONS | ||||||
|---|---|---|---|---|---|---|
| MATERIAL DESIGNATION EN1652 or Alloy | NEAREST FIT | Key Features | Key Markets | Applications | ||
| Symbol/ Name | Number | UNS | BS 2870 | |||
| HIGH CONDUCTIVITY COPPERS | ||||||
| Cu-ETP | CW004A | C11000 | C101 | Cu-ETP has no susceptibility to hydrogen embrittlement as well as a high electrical conductivity of 101% IACS. This is due to a high purity and an absence of deoxidisers. | Architectural, Chemical Engineering, Culinary, Electrical | Electrical Components, Chemical Process Equipment, Radiators, Kitchen Appliances, Conductors, Transformer Windings, Wire: Shapes, Knitting, Braiding, Weaving |
| Cu-ETP1 | CW003A | C11040 | - | Available by Request | ||
| Cu-OF | CW008A | C10200 | C103 | Cu-OF is a High purity Copper Oxygen Free (maximum of 10ppm) alloy, offering 100% IACS. It is immune from hydrogen embrittlement and offers similar formability to Cu-ETP. | Electronics, Telecommunications | Printed Circuits, Electronic Components, Telecommunication Cables |
Choosing your Conductive Copper Supplier
The Knight Group Advantage
Extensive Stock Availability: Quick access to common copper grades and dimensions
Fast Turnaround Times: Streamlined processes and an efficient supply chain ensure quick turnaround times so you can stay ahead of schedule.
Tight Tolerance Precision Processing: Comprehensive In-house wire processing capability, including cut-to-length, stranding, bunching, braiding, overbraiding and more
Custom Solutions: Bespoke material supply to meet your technical drawings or product specifications
Technical Expertise: Over 85 years of experience supporting global manufacturers every step of the way
Trusted Supply Chain Partner: Superior quality, with rigorous quality control measures, ensuring exceptional product performance, consistency, and reliability. Accredited ISO 9001, 9100 and 9120
Low MOQs: Order quantities suited to small-scale projects and prototyping through to high-volume production runs
Processing Services Available
We offer full-service support with the following value-added processes:
Cut-to-length wire
Stranding
Bunching
Bespoke spool type, size and weight to your specifications
Cleaning and degreasing for electronic and medical use
Protective packaging for safe shipment
Conductive Copper Applications by Sector​
Copper Alloys offer many manufacturing benefits, including strength, conductivity, corrosion resistance, machinability and ductility. With superior electrical and thermal conductivity and an attractive appearance, Copper Alloys are suitable for a wide range of applications.
Our conductive copper products are trusted across a wide range of industries:
Electronics & Electrical Engineering: Circuitry, battery connectors, EMI shielding
Automotive: EV battery connections, stator windings, sensors
Aerospace: Electrical grounding systems, avionics
Medical Devices: Precision components requiring high conductivity and biocompatibility
Renewable Energy: Solar panel connectors, inverters, wind turbine generators
Enquire About Conductive Copper Wire
Looking for conductive copper wire for your electrical applications?Â
Unlock the potential of our conductive copper wire with the Knight Group. Contact us today to discuss your requirements and receive a tailored quotation.
Let our alloys propel your projects to new heights of success.
Use the links below or contact us directly at:
Precision Wire: +44 (0)1707 645261
Comprehensive FAQ Conductive Copper Alloy Wire
We hope this comprehensive FAQ guide will answer all your questions about our conductive copper wire product range and services. If you require further assistance or would like to place an order, you can use the contact form, +44 (0)1707 650251 or salesenquiries@knight-group.co.uk
Cu-ETP contains small traces of oxygen and is suitable for most electrical applications. Cu-OF is oxygen-free, offering higher conductivity and resistance to embrittlement, which is particularly important in vacuum or high-frequency environments.
Cu-ETP contains small traces of oxygen and is suitable for most electrical applications. Cu-OF is oxygen-free, offering higher conductivity and resistance to embrittlement, which is particularly important in vacuum or high-frequency environments.
IACS stands for the International Annealed Copper Standard.
IACS is the benchmark used to measure the electrical conductivity of metals. Materials like Cu-ETP and Cu-OF are rated as a percentage of this standard, helping engineers compare copper’s efficiency in electrical applications.
Yes, conductive copper can be used in high-temperature environments, but the specific grade matters.
Cu-ETP1 and Cu-OF offer greater stability in high-temperature or hydrogen-rich settings compared to standard Cu-ETP.
Available Grades & Specifications
We supply three primary conductive copper grades, each offering specific advantages depending on your technical and environmental requirements:
Cu-ETP (CW004A) – Electrolytic Tough Pitch Copper
- Conductivity: ≥100% IACS
- Purity: ≥99.90% Cu
- Characteristics: Standard grade copper with excellent electrical conductivity and workability.
- Applications: Electrical wiring, busbars, power connectors, switchgear, circuit boards.
Cu-OF (CW008A) – Oxygen-Free Copper
- Conductivity: ≥101% IACS
- Purity: ≥99.95% Cu
- Characteristics: Superior conductivity, no oxygen content, improved resistance to hydrogen embrittlement.
- Applications: Vacuum tubes, audio equipment, sensitive electronic components, high-frequency conductors.
Cu-ETP1 (CW003A) – High-Purity ETP Copper
- Conductivity: Slightly higher than standard Cu-ETP
- Purity: Enhanced compared to standard ETP
- Characteristics: Improved electrical performance, reduced risk of embrittlement during processing.
- Applications: Transformers, electric motors, renewable energy systems.
These grades are available in precision wire. We can supply material in various tempers, sizes, and weights, each tailored to your exact specifications.
Absolutely. We support both small-scale projects and high-volume production runs.
To find out more, please get in touch with our knowledgable sales team:
Telephone: +44 (0)1707 645261Â
Email: wire.sales@knight-group.co.uk
We typically supply conductive copper in round wire and flat wire, and some grades may also be available in shaped wire and strip.Â
Custom dimensions are available to suit your specific needs.
To find out more or request a non-obligation quote, please contact our sales team:
Telephone: +44 (0)1707 645261Â
Email: wire.sales@knight-group.co.uk
Yes, we supply copper in a range of tempers, including:
- Annealed copper wire
- Hard-drawn copper wire.
- Other tempers available by request
We offer free quotations on your individual product and processing requirements and can provide expert advice on selecting the material for your application. Let us know your specific requirements, and we will deliver material that meets your exact needs.
To find out more, please get in touch with our knowledgable sales team:
Telephone: +44 (0)1707 645261Â
Email: wire.sales@knight-group.co.uk
Quality assurance is integral to our operations. We employ rigorous and non-destructive evaluation to ensure that our materials meet the highest quality standards demanded by our customers.
We hold a number of recognised industry approvals, as well as ISO 9001, ISO 9120 REV A and 9100. For full details and copies of our certification, visit our dedicated Approvals page or contact one of dedicated team for further instance on our contact form, +44 (0)1707 650251 or salesenquiries@knight-group.co.uk
Further testing and inspection protocols, including chemical analysis, mechanical testing are available by request, prior to order placement.
Lead times vary depending on quantity and processing needs, but standard stock items can often be dispatched within a few working days.
To find out more, please get in touch with our knowledgable sales team:
Telephone: +44 (0)1707 645261Â
Email: wire.sales@knight-group.co.uk
Yes, all our copper grades conform to applicable RoHS and REACH regulations.
 Documentation is available to download here.
You can purchase high-quality conductive copper wire from our dedicated wire division, Knight Precision Wire.
We supply over 160 unique alloy grades, including the most popular alloys used in applications requiring conductive copper materials.
We offer free quotations on your individual product and processing requirements and can provide expert advice on selecting the material for your application. To find out more, use our contact form, telephone us at Telephone: +44 (0)1707 645261 or email our expert sales at wire.sales@knight-group.co.uk
All data is provided for informational purposes only. In no event will the Knight Group and its subsidiaries, be liable for in respect of any action taken by any third party arising from using the information taken from our online or printed sources. Chemical and Mechanical Properties should not be construed as maximum or minimum values for specifications, nor should information be used to assess suitability for a particular use or application. The information and data provided is deemed to be accurate to the best of our knowledge and may be revised anytime without notice and assume no duty to update