Author: Scott Bredemann
Updated: 02/13/2025
Copper is valued for its high electrical and thermal conductivity, corrosion resistance, and durability. It can be found in electrical systems, industrial machinery, or precision components, copper is a reliable choice for engineers who need efficiency and longevity in their designs. While alternative materials exist, few offer the same balance of performance and dependablity. In this article, we’ll take a detailed look at copper’s properties, its common applications in manufacturing, and some key considerations when working with it.
What is Copper?
Copper (Cu) is a ductile, non-ferrous metal with an atomic number of 29 and a face-centered cubic (FCC) crystal structure. It is one of the best conductors of electricity and heat, surpassed only by silver. This high conductivity is due to its single valence electron, which moves freely within its atomic lattice, allowing for minimal resistance to electron flow.
With a density of 8.96 g/cm³ and a melting point of 1,085°C (1,984°F), copper is both relatively heavy and capable of withstanding high temperatures without significant degradation. Its corrosion resistance stems from the formation of a thin oxide layer when exposed to air, which acts as a protective barrier against further oxidation. Unlike ferrous metals, copper does not rust; instead, it develops a patina, which can range from a reddish-brown oxide layer to a greenish layer of copper carbonate in humid environments.
Mechanically, copper exhibits excellent malleability and ductility, meaning it can be drawn into wire or formed into complex shapes without fracturing. It also has a relatively low hardness (Brinell hardness of ~35 HB for pure copper), making it easy to machine, though it can work-harden under repeated stress.
In addition to its pure form, copper is often alloyed with other elements like zinc (to form brass), tin (to form bronze), and beryllium (to enhance strength and fatigue resistance). These alloys expand copper’s applications, allowing it to be used in structural components, high-wear environments, and precision electrical contacts.
History:
Evidence of its use dating back over 10,000 years. Early civilizations, such as the Egyptians, Mesopotamians, and Chinese, recognized its malleability and corrosion resistance, using it for tools, weapons, and decorative artifacts. The discovery of alloying—particularly with tin to create bronze—led to the Bronze Age (approximately 3300–1200 BCE), a period marked by significant advancements in metalworking and manufacturing.
During the Industrial Revolution (18th–19th centuries), copper became essential for steam engines, electrical wiring, and machinery due to its excellent conductivity and workability. The advent of electricity in the late 19th century further cemented copper’s importance, as it became the standard for power transmission, motors, and telecommunications.
Where is it Found?
The largest copper-producing countries include:
- Chile – The world’s top copper producer, home to massive deposits like Escondida and Chuquicamata.
- Peru – Rich in high-grade copper reserves, with mines such as Antamina and Cerro Verde.
- China – Both a major producer and consumer of copper, with significant mining operations in Jiangxi and Tibet.
- United States – Arizona, Utah, and New Mexico hold the largest copper reserves, with operations like Bingham Canyon and Morenci.
- Democratic Republic of the Congo (DRC) – The leading copper producer in Africa, with high-grade deposits in the Katanga region.
Types of Copper
Copper is available in several grades and forms, each suited for different applications based on its purity, mechanical properties, and intended use. While pure copper is ideal for electrical and thermal applications, various copper alloys enhance strength, wear resistance, and machinability. Below are the main classifications of copper used in manufacturing:
1. Pure Copper (Electrolytic and Oxygen-Free Copper)
Pure copper, typically defined as containing at least 99.3% copper, is used where high conductivity and corrosion resistance are required.
- Electrolytic Tough Pitch (ETP) Copper (C110) – This is the most common form of commercially available copper. It contains a small amount of oxygen (0.02–0.04%) and has a conductivity of approximately 101% IACS (International Annealed Copper Standard). It is used in electrical wiring, bus bars, and power transmission systems.
- Oxygen-Free High Conductivity (OFHC) Copper (C101 & C102) – Produced using a refining process that removes oxygen, OFHC copper has superior electrical and thermal conductivity compared to ETP copper. It is used in high-vacuum applications, superconductors, and semiconductor manufacturing, where even trace amounts of oxygen can affect performance.
2. Deoxidized Copper (DHP & DLP)
Deoxidized copper contains small amounts of phosphorus to reduce oxygen content, improving workability and corrosion resistance.
- DHP (Deoxidized High Phosphorus) Copper (C122) – Used in plumbing, heat exchangers, and brazed assemblies, as it is highly resistant to hydrogen embrittlement.
- DLP (Deoxidized Low Phosphorus) Copper (C120) – Offers similar benefits to DHP copper but with slightly higher conductivity.
3. Copper Alloys
Adding other elements to copper alters its mechanical properties, allowing it to be used in more demanding applications.
- Brass (Copper-Zinc Alloys, C260-C464) – Brass increases strength and corrosion resistance while maintaining good machinability. It is used in fittings, valves, and decorative applications.
- Bronze (Copper-Tin Alloys, C510-C544) – Bronze is harder and more wear-resistant than pure copper, making it ideal for bearings, gears, and marine components.
- Beryllium Copper (C172, C175) – One of the strongest copper alloys, beryllium copper combines high strength, electrical conductivity, and non-sparking properties, making it ideal for aerospace, precision instruments, and tools used in explosive environments.
- Nickel-Copper (Monel, C706, C715) – These alloys offer exceptional corrosion resistance, particularly in marine and chemical processing applications.
Physical Properties and Uses
| Type of Copper | Composition | Electrical Conductivity (% IACS) | Thermal Conductivity (W/m·K) | Hardness (Brinell, HB) | Tensile Strength (MPa) | Key Applications |
| Electrolytic Tough Pitch (ETP) Copper (C110) | ~99.9% Cu, ~0.02-0.04% O₂ | ~101% | ~385 | ~35 | 210-250 | Electrical wiring, bus bars, power transmission |
| Oxygen-Free High Conductivity (OFHC) Copper (C101, C102) | ~99.99% Cu, no oxygen | ~101-102% | ~385 | ~40 | 220-260 | High-purity electrical components, vacuum systems |
| Deoxidized High Phosphorus (DHP) Copper (C122) | ~99.9% Cu, 0.015-0.04% P | ~85-90% | ~330 | ~45 | 250-290 | Plumbing, heat exchangers, brazing applications |
| Brass (C260 – C464) | Cu-Zn (varies) | ~28-56% | ~120-150 | ~55-110 | 300-600 | Fittings, valves, decorative applications |
| Bronze (C510 – C544) | Cu-Sn (varies) | ~15-35% | ~60-75 | ~70-150 | 350-750 | Bearings, gears, marine applications |
| Beryllium Copper (C172, C175) | Cu-1.8-2% Be | ~16-25% | ~105-125 | ~120-200 | 1000-1400 | Precision tools, aerospace, non-sparking tools |
| Nickel-Copper (Monel, C706, C715) | Cu-10-30% Ni | ~5-20% | ~50-90 | ~100-180 | 400-900 | Marine, chemical processing, corrosion-resistant applications |
| Precipitation-Hardened Copper Alloys (C182, C180) | Cu-Cr, Cu-Ni-Si | ~40-75% | ~200-280 | ~80-160 | 500-900 | Welding electrodes, electrical contacts, high-strength parts |
Common Applications in Manufacturing
Copper’s unique combination of electrical conductivity, thermal efficiency, corrosion resistance, and malleability makes it an essential material across various manufacturing industries. Here are some of the most common applications:
1. Electrical and Electronics
- Electrical wiring and power transmission cables
- Printed circuit boards (PCBs)
- Bus bars and switchgear components
- Electrical connectors and terminals
- Electromagnets and transformers
2. Industrial Machinery and Equipment
- Heat exchangers and radiators
- Bearings and bushings (bronze alloys)
- Welding electrodes and resistance welding components
- Hydraulic and pneumatic tubing
- Mold components for injection molding
3. Automotive and Aerospace
- EV battery connectors and bus bars
- Radiators and cooling systems
- Brake tubing and fuel lines
- High-performance aerospace alloys (beryllium copper)
- Structural components in aircraft and spacecraft
4. Plumbing and HVAC
- Pipes, tubing, and fittings for water and gas systems
- Air conditioning and refrigeration coils
- Boiler components and steam generators
- Solar water heating systems
5. Marine and Corrosion-Resistant Applications
- Ship hulls and propellers (nickel-copper alloys)
- Heat exchangers in desalination plants
- Offshore oil and gas drilling components
- Corrosion-resistant fasteners and valves
6. Medical and Healthcare
- Antimicrobial surfaces for hospital equipment
- Surgical instruments and dental tools
- MRI and medical imaging equipment
- High-purity vacuum systems in pharmaceuticals
7. Renewable Energy and Sustainable Technologies
- Solar panel connectors and photovoltaic cell components
- Wind turbine generators and wiring
- Electric vehicle (EV) charging infrastructure
- Geothermal and hydroelectric power systems
At MISUMI USA, we offer precision components and custom manufacturing solutions to meet your exact specifications. Explore our extensive selection or contact our team to find the right copper components for your project. Get started today at MISUMI USA!
Sample of products from MISUMI USA made with copper:
https://us.misumi-ec.com/vona2/mech/M2000000000/M2001000000/M2001030000/
https://us.misumi-ec.com/vona2/mech/M2000000000/M2003000000/M2003090000/
https://us.misumi-ec.com/vona2/el_control/E1500000000/E1502000000/E1502120000/