C110 / CW009A is a very high purity certified grade of oxygen free copper for electronic type applications. The material is manufactured from pure cathode copper and poured in a protective gas atmosphere. It has a minimum copper content of 99.99% and offers a minimum electrical conductivity of 101.5% IACS. To ensure a resistance to hydrogen embrittlement the maximum oxygen content is restricted to 5 ppm with other individual impurity values limited to 25 ppm.
The combination of the highest available thermal and electrical conductivity values, an excellent formability, an adherent oxide film and excellent joining/welding properties it can be utilised in the electrical and high vacuum industries as well.
Chemical Composition
Copper 99.99% min
Phosphorus 0.0003% max
Sulphur 0.002% max
Lead 0.001% max
Total Others 0.0050% max
(incl. As, SB, Bi, Cd, Mn, Se, Te, Zn - no single impurity shall exceed 0.0025%)
Related Specifications
C10100 OFE
BS1433 C110
BS3839
BS13604 CW009A
Cu-OFE
Cu-C2
Key Features
Very High Purity
Highest Conductivity Values
Excellent formability
Freedom from Hydrogen Embrittlement
Excellent Joining Characteristics
Typical Physical Properties
Melting Point 1083°C
Density 8.94 g/cm³
Specific heat 385 J/Kg °K
Thermal conductivity 399 W/m°C
Thermal expansion coefficient (20-200°C) 17.3 x 10-6
Electrical conductivity 101.5 % IACS
Electrical resistivity 0.017 microhm m
Modulus of elasticity 118000 N/mm²
Fabrication Properties
Hot Working Temperature Range 600-800°C
Hot Formability Good
Cold Formability Excellent
Cold reduction between anneals 95% max.
Machinability rating (free cutting brass = 100) 20%
Joining Methods
Soldering Excellent
Brazing Excellent
Oxy-acetylene welding Good
Gas-shielded arc welding Excellent
Resistance welding: Spot and Seam Not recommended
Butt Good
Typical Uses:
Traditional uses for C110 / CW009A OFE copper include material for vacuum capacitors and circuit breakers, gaskets for vacuum apparatus, magnetrons, bases for semi-conductors, electronic components, anodes, electrical instruments, rotor conductors for large capacity generators and motors, electrical and electronic components at cryogenic temperatures.