Hi Wayne,

There are a number of things that bring these boards into question. What
I am concerned with is the crazing.

I think that the fabricator has an automated plating line that requires
two passes to get the copper thickness.


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] 

 


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wayne Thayer
Sent: December 13, 2013 1:13 PM
To: [log in to unmask]
Subject: Re: [TN] Crazing - the pictures

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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