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Subject:	Re: Micro-inch to copper weight conversion...
From:	"Blair K. Hogg" <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Fri, 30 May 2003 16:31:47 -0400
Content-Type:	text/plain
Parts/Attachments:	text/plain (46 lines)

I thought I qualified my analysis in the last statement:

"Of course, the copper used is probably not the pure Cu which has a density of 8.2 g/cm3, so that actual thickness may be off somewhat from this calculation."

Guess that wasn't specific enough. 

Happy Friday!

>>> [log in to unmask] 05/30/03 03:49PM >>>
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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