Moisture 'between' the mask and board? Wouldn't that cause adhesion issues?
Moisture 'entrapped' in the mask appears as haze whereas this has well
defined features, not 'milky or cloudy'.
In any respect I would consider this cosmetic and acceptable.
Franklin
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Afri Singh
Sent: Thursday, December 08, 2005 8:33 AM
To: [log in to unmask]
Subject: Re: [TN] What is this solder mask defect?
Looks like moisture trapped under the mask
Did you dry these boards before applying mask ? --otherwise you can get
oxidation
on cu under the mask
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Edward Szpruch
Sent: Thursday, December 08, 2005 8:30 AM
To: [log in to unmask]
Subject: Re: [TN] What is this solder mask defect?
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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