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. * ***************************************************************************