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February 1997

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Subject:
RE: 3 layer board with 4 oz copper
From:
Terry Zhu <[log in to unmask]>
Date:
Thu, 27 Feb 1997 20:33:02 -0800
Content-Type:
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1) Let it through etcher four times as you do for 1 oz copper and if the finish width is absolute importnat to you, you may compensate a trace/space, while  you do image .
2) You need a lot , a lot resin to fill up the space 

----------
From: 	sam mccorkel[SMTP:[log in to unmask]]
Sent: 	Thursday, February 27, 1997 11:42 AM
To: 	[log in to unmask]
Subject: 	FAB: 3 layer board with 4 oz copper 

I have 2 issues that I'd like to get some advise on.
1) Does anybody have advise on etching 4 oz copper? The traces are .024" and
we etch with ammoniacal etchant.
2) Is there any advise on laminating a 3 layer board with 4 oz base copper
on all layers? .062" finish thickness and the layup is at our discretion.

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