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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