ELECTROLYTIC COPPER FOIL

摘要

PROBLEM TO BE SOLVED: To provide an electrolytic copper foil excellent in extensibility durable against change of expansion and contraction in minute unit while having strong strength.SOLUTION: The electrolytic copper foil has a normal tensile strength obtained from a tensile strength test compliant with IPC-TM-650 of 45 kg/mmto 70 kg/mm, and the number of times of bending to fracture by MIT flexibility test compliant with JIS P 8115 of 70 to 400 in each of MD and TD.