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December 2005

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Subject:
Re: What is this solder mask defect?
From:
Edward Szpruch <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Edward Szpruch <[log in to unmask]>
Date:
Thu, 8 Dec 2005 15:30:28 +0200
Content-Type:
text/plain
Parts/Attachments:
text/plain (62 lines) 
This is a little driver looking on cloud in the sky...
More seriously- I believe this is oxidised copper below soldermask.Seems to
be harmless, probably visual effect.Usually oxidation on copper does not
effect adhesion.
Edward


> -----Original Message-----
> From: Stephen Gregory [SMTP:[log in to unmask]]
> Sent: ב דצמבר 05 2005 16:49
> To:   [log in to unmask]
> Subject:      Re: [TN] What is this solder mask defect?
> 
> Good Morning Everyone!
> 
> I got Wee Mei's picture up...go to:
> 
> http://stevezeva.homestead.com/files/Soldermask_Defect.JPG
> 
> I've seen this before, but I can't explain it either.
> 
> Kind Regards,
> 
> -Steve Gregory-
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Wee Mei
> Sent: Sunday, December 04, 2005 6:58 PM
> To: [log in to unmask]
> Subject: [TN] What is this solder mask defect?
> 
> Steve,
> 
> Hello,
> 
> The suspect is completely flat and smooth to touch. An interesting
> observation is that though it appear at the same location for all the
> 10pcs
> of board, the size of the image tend to get smaller and smaller if the
> boards are arranged starting with the largest image. It can't be soda
> strawing as it is not on trace. It can't be pink ring as it is not
> around
> hole. What can it be? What is the likely cause?
> 
> Will ask Steve to put it up. Kindly take a look. Your opinion is greatly
> appreciated.
> 
> Regards,
> Wee Mei
> 
> 

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