What is CuF25 - DIN 1787 (1973)

[lynxette]

Hi expert

I'm in this forum. I wanna ask about the copper standard for busbar electrical connections. My customer requests copper CuF25 as per DIN 1787 (1973). When I'm looking the DIN 1787 (1973) this standard has been withdrawn, is it right??
Do you have any recommendations, what the alternative copper bar its similar or equivalent with CuF25??

Thanks, have a nice day