Oxygen-free copper grades are categorized by standard system as follows:
I. International common grade
C10100 (OFHCopper): the highest purity (≥99.995%), used in superconducting materials, telecommunications and semiconductor fields.
C10200 (OF copper): oxygen content is slightly higher than C10100, widely used in wire, cable and transformer manufacturing.
C1100: Japan JIS standard grade, excellent conductivity, but need to avoid high-temperature reducing environment use.
Second, the Chinese national standard (GB) grade
TU0: strict chemical composition, copper content ≥ 99.95%, suitable for high-precision current transmission scenarios.
TU1: purity ≥99.95%, commonly used in wires and cables, high vacuum electronic devices.
TU2: performance close to TU1, impurity control is stricter, applicable to electric vacuum devices and precision instruments.
Other regional standards
C1020: Japan's standard grade, purity close to 100%, used in high-frequency cables, sensors and other high-end electronic devices.
Fourth, the grade characteristics comparison
Grade
Standard system
Main application areas
Characteristic differences
C10100 International general superconducting materials, semiconductors, the highest purity (≥99.995%)
TU1/TU2 Chinese national standard Vacuum electronic devices, precision instruments National standard impurity control is more stringent
C1100 Japan JIS Electrical equipment, high-frequency components Easy to "hydrogen disease" at high temperature, environmental control is required.
