Hi Blair,
Unfortunately, your assumption that you know the specific gravity (density)
of ED copper is incorrect--you do not know it--it is less than the specific
gravity (density) of rolled copper because of organic co-deposits and
micro-voids. This uncertainty in specific gravity (density) prevents a direct conversion
of oz./ft2 to thickness, and thhat is why ED copper is spec'd in oz./ft2.

Regards,
Werner Engelmaier
Fornercahairman of IPC Copper Fopil Committee

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