The 1.181 is from the 6012 or 6013 spec. We are using a single ply of 1080
on a lot of product between two 1 oz. copper layers with the following
caveats a) voltage between the layers needs to be low b) per the spec this
minimum dielectric spacing needs to be specified on the drawing c) use low
profile copper foils d)we test every lot of material to make sure we will
get enough flow and enough dielectric spacing e) we have our pre-preg
supplier making this to a spec we came up with that they agreed to. Have
fun. Regards Steve Kelly

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Ahne Oosterhof
Sent: June-01-10 3:03 PM
To: [log in to unmask]
Subject: Re: [TN] Single-ply construction

Careful now; a single successful test tells you it MAY work, a failing test
teaches you a lot: it does not work.

Having fun,
Ahne.

PS:
FR406 1080
Glass style 1080: thickness 1.9-2.3 mil (is that the range of the glass
fibers? If not, what is?)
Customer demand dielectric thickness: min dielectric thickness of 1.181 mil
(30um).
Puzzling.



-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dwight Mattix
Sent: Tuesday, June 01, 2010 09:52
To: [log in to unmask]
Subject: Re: [TN] Single-ply construction

If prepreg bonding to cores then the tooth isn't an issue.

Have they got lead time to allow for a scout lot thru 
lamination?  Maybe you can negotiate an R&D type P.O. that gets you 
paid for that test effort regardless of flow/fill/delam. Then that 
becomes a gate/decision point for both parties to decide whether or 
not to proceed beyond that with full qty.


At 09:18 AM 6/1/2010, Chuck Brummer wrote:
>Dan,
>
>Are they not concerned that the dielectric breakdown will be too low?  You
>will have the tooth of the copper touching the glass fabric on both sides.
>
>There may be cross-talk issues too?
>
>Chuck Brummer
>3M Manufacturing Engineer
>8357 Canoga Ave.
>Canoga Park, CA 91304-2605
>(818) 734-4930
>
>
>
>
>From:
>Dan Skweres <[log in to unmask]>
>To:
>[log in to unmask]
>Date:
>06/01/2010 08:19 AM
>Subject:
>[TN] Single-ply construction
>Sent by:
>TechNet <[log in to unmask]>
>
>
>
>We have a customer insisting that we use a single ply of FR406 1080
>between two copper layers each 1 oz. copper. One layer is a plane and the
>other a signal. We're quite concerned that there will be issues with fill.
>We don't recommend single-ply construction especially against two 1 oz.
>copper layers. Any thoughts, comments and/or concerns would be
>appreciated.
>Thanks!
>Dan S.
>
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