some copper plate processes but down electroless then "flash plate" a
layer of ED copper. Next put down resist pattern to plate.
I suspect that's what you see here.
Charles W. Brummer | 3M Manufacturing Engineer
3M Electronic Solutions Division
3M Canoga Park, 8357 Canoga Ave. | Canoga Park, CA 91304
Office: 818 734 4930
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From: Don Vischulis <[log in to unmask]>
To: <[log in to unmask]>
Date: 12/13/2013 10:27 AM
Subject: Re: [TN] Crazing - the pictures
Sent by: TechNet <[log in to unmask]>
Wayne
I agree
Don Vischulis
Sent from my iPhone
> On Dec 13, 2013, at 12:13 PM, Wayne Thayer <[log in to unmask]> wrote:
>
> Hi Paul-
>
> Nice sections.
>
> Aren't they supposed to have the drill actually spin when they push it
through the board?
>
> What's going on with the two layers of plating? That first layer is
more than electroless would normally put down. I guess maybe they checked
hole size reduction to see how much plating they put down, realized they'd
missed a minimum on the hole wall, and put it back into the bath.
>
> I tend to think of the defect you have been talking about as "heavily
damaged fibers", and think of crazing as voids/cracks within the prepreg.
I agree that I would be very concerned about the long term reliability of
these boards and would like to know how much fallout the fabricator had
due to plating shorts along these damaged fibers.
>
> Wayne
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Paul Reid
> Sent: Friday, December 13, 2013 12:49 PM
> To: [log in to unmask]
> Subject: [TN] Crazing - the pictures
>
> Hi Everyone,
>
>
>
> I finally found Steve Gregory's email address. He has kindly posted some
the pictures of the crazing that I found.
>
>
>
> http://stevezeva.homestead.com/6494_2_1_mod.jpg
>
>
>
> http://stevezeva.homestead.com/6494_M_001.jpg
>
>
>
> http://stevezeva.homestead.com/6496_2_10.jpg
>
>
>
>
>
> Sincerely,
>
>
>
> Paul Reid
>
> Program Coordinator
>
> PWB Interconnect Solutions Inc.
> 235 Stafford Rd., West, Unit 103
> Nepean, Ontario Canada, K2H 9C1
>
> 613 596 4244 ext. 229
>
> Skype paul_reid_pwb
> [log in to unmask]
>
>
>
>
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