Sounds like an undercure problem or perhaps a cleanliness issue, 
     though I'm at a loss to explain how multiple vendors and both LPI & 
     Dry Film soldermasks are all exhibiting the same conditions. 
     
     Improper cure is the easiest test to accomplish in this case. Try 
     baking boards to establish masks are properly cured. Contact your 
     vendor for recommended times and temps. You might also question your 
     vendors about their cleaning techniques prior to mask application. 
     
     These are a good starting point for now, Good Luck....


______________________________ Reply Separator _________________________________
Subject: Re[2]: ASSY: soldermask flaking
Author:  [log in to unmask] (Jon_Silvernail) at INTERNET_GATEWAY
Date:    7/26/96 12:50 PM


     The solder mask is over copper, flaking from traces and ground planes, 
     on the solder side.
     
     
     
     
______________________________ Reply Separator _________________________________
Subject: Re: ASSY: soldermask flaking
Author:  "TOM BRESNAN" <[log in to unmask]> at pengate 
Date:    7/26/96 9:11 AM
     
     
     Jon... Need some more details about the boards. Soldermask is flaking 
     from circuits or laminate; circuits are soldermask over -bare copper, 
     -solder, -gold?
     
     
______________________________ Reply Separator _________________________________
Subject: ASSY: soldermask flaking
Author:  [log in to unmask] at INTERNET_GATEWAY 
Date:    7/26/96 6:14 AM
     
     
     
     We are looking for solutions for the random occurrences of the solder 
     mask flaking.  We are experiencing the flaking from several board 
     manufacturers and several different masks, LPI and Dry Film.  The 
     flaking is occurring during the wave solder process.  
     
     We use a no-clean flux and spray fluxer.  We  run at 4.5 ft/min., with 
     a top side temperature at 210F, with five feet of bottom side IR 
     preheat and 2 feet top side.  Our incoming inspection does not test to 
     IPC840C, does anyone? 
     
     Thank you,
     
     Jon Silvernail
     [log in to unmask]
     
     
*************************************************************************** 
* TechNet mail list is provided as a service by IPC using SmartList v3.05 * 
*************************************************************************** 
* To unsubscribe from this list at any time, send a message to:           * 
* [log in to unmask] with <subject: unsubscribe> and no text.        * 
***************************************************************************
     
     
*************************************************************************** 
* TechNet mail list is provided as a service by IPC using SmartList v3.05 * 
*************************************************************************** 
* To unsubscribe from this list at any time, send a message to:           * 
* [log in to unmask] with <subject: unsubscribe> and no text.        * 
***************************************************************************
     

***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to:           *
* [log in to unmask] with <subject: unsubscribe> and no text.        *
***************************************************************************