Alloys

C688 (CuZn23Al3,5Co)

Standard designation

EN not standardised/UNS C68800

Chemical composition
Cu Rest
Zn [%] 23
Al [%] 3.5
Co [%] 0.4
Description/applications

C688 belongs to the group of copper-zinc materials with further alloy elements. C688 is characterised by a high level of strength and good bending properties. Applications: connectors, insulation displacement connectors

Physical properties¹
Density 8.2 g/cm³
Electrical conductivity 10.4 m/Ω·mm² 18 %IACS²
Thermal conductivity 81 W/m·K
Thermal expansion coefficient 18.2·10-6/K
E modulus 115 GPa³
¹Approximate values in soft state, measured at ambient temperature
²IACS = International Annealed Copper Standard
³1 GPa = 1 kN/mm²
Processing information
Weldability good
Solderability medium
Stress crack corrosion low vulnerability
Mechanical properties
State Tensile strength Rm [MPa] Yield strength Rp0.2 [MPa] Elongation
A50 [%]		 Hardness
HV
R530 530-600 min. 305 min. 30 150-180
R600 600-695 min. 435 min. 10 180-220
R670 670-770 min. 565 min. 3 190-230
R730 730-825 min. 655 min. 2 200-240
R780 780-875 min. 705 min. 2 210-250
R850 850-915 min. 765 min. 1 220-260
R895 min. 895 min. 805 min. 1 min. 235

More information

Data sheet
File type
C688 (CuZn23Al3,5Co)
PDF (298.92 KB)