Hi All! Maybe some of you remember quite a while back, I had a problem with some boards with the soldermask flaking off all the copper after 3-cleanings in our MCS-1000. It's basically a fancy-smancy batch cleaner. We use Kyzen Aquanox XJN at between a 25-30% concentration (recommended by Kyzen). We also run our wash temps at 140º F., and our rinse at 120º F. Back when it happened last time we narrowed things down to the soldermask not being able to take the Aquanox, it was a dry-film (Dynachem Dynamask). We had other boards that had dry-film on them that we built and showed no ill-effects from the cleaning. I looked into things and learned that these boards were masked with a Dupont 8100 series dryfilm...so made it a point to specify Dupont dry-film on the boards that require dry-film. Well guess what? I'm starting to see the problem again. Our fab vendor swears up and down they used a Dupont dry-film. What I see, is that after the second wash the mask will start to "bubble" and lift on the vias (and sometimes the traces too), the film hasn't broken yet (it's still intact, it appears to just be lifting from the copper), but after you wash the board the third time, the mask starts flaking off all the copper... vias, traces, everywhere. So I guess I'm starting to wonder now if it's really a mask compatibility issue with the Aquanox, or is it possibly something about the quality of the surface prep prior to solder masking? Have any of you seen this before? Thanks! -Steve Gregory- ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ##############################################################