Sounds like moisture in the fab... How are they being baked prior to assembly? Franklin Barry Gallegos wrote: > Dear Sirs, Madams, Guru’s. > > I have an assembly that we processed thru SMT and then thru the wave > solder operations. Wave solder flux was with Alpha metals 856 > water-soluble. The assembly is exhibiting a white cloudy / milky > appearance that looks almost as if the laminate/solder mask has > changed color. No matter how much we wash this assembly, it will not > go away. > > Is this due to possible moisture in, around or under the solder mask / > laminate. What is it andis it acceptable. > > > Any advice would be appreciated. > > > Yours truly, (wana-be guru.) > > Barry Gallegos > > Western Electronics. > > 208-377-1557 > ############################################################## 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 ##############################################################