you do know you could pay them to apply a second coat of solder mask over 
the first if you need to salvage.

4 micron at the knee where you looked doesn't mean that there are places 
with less.

Chuck


Charles W. Brummer | 3M Manufacturing Engineer
3M Electronic Solutions Division
3M Canoga Park, 8357 Canoga Ave. | Canoga Park, CA 91304
Office: 818 734 4930
[log in to unmask] | www.3M.com


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From:   Ramakrishnan Saravanan <[log in to unmask]>
To:     <[log in to unmask]>
Date:   03/16/2013 09:12 AM
Subject:        [TN] Solder Mask sensitivity to environment
Sent by:        TechNet <[log in to unmask]>



Hi, 

Our contract suppliers have supplied a batch of PCBs with less solder mask 
thickness. ( 4 micron on the knee and 8 microns on the track center). 
Since we specified only solder mask coverage in the procurement spec, we 
can't reject.  The PCBs are meant for High reliability applications. 

Is there any way to find out moisture sensitivity of the solder mask on 
actual board where IPC comb pattern is not available ?.

regards,

R.Saravanan



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