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 and  is it acceptable.

 

Any advice would be appreciated.

Yours truly, (wana-be guru.)

 

Barry Gallegos

Western Electronics.

208-377-1557