On Apr 1, 2019, at 11:38 AM, [log in to unmask] wrote: > Hello fellow designers, > > One of our products uses 3 PCBA's made on our internal surface > mount line. After the PCBA's are created, they are hand soldered > together with through hole components and then put into a housing > which is then filled with an Epoxy resin (Stycast 2075). > > We are wondering about moisture update on the PCBA's between the > surface mount process and our hand soldering process. There is some > concern that any moisture absorbed would be trapped by the resin > and therefore lead to premature electrical failure in harsh > applications. Our factory is located in Ontario and is air > conditioned in the warm months. > > Option 1 (best case) > We would like to avoid any special drying or baking process on the > PCBA's. > * Does anyone think there would be a risk in doing this? > > Option 2 > We could put them in a dry cabinet. The one we have is a Dr. > Storage T40W-600. It runs at 40C and <=5%RH. > * Is this temperature of 40C enough to dry out the PCBA's? > * How long should they be stored in there before use? > > Option 3 > We could buy a baking oven similar to what is used for components > prior to re-flow. > * What temperature and duration would be suitable? > > I have some IPC standards (J-STD-033D, 1601A) but I'm not sure how > to relate our PCBA's to the tables of drying/baking conditions. > > With Best Regards, > Mike Messenger, P.Eng, PMP > > Siemens Canada Limited > Manufacturing Engineer > PD PA PI LWT IE > 1954 Technology Drive > Peterborough, ON K9J 7B1 > 705-740-7025 > [log in to unmask]<mailto:[log in to unmask]> > www.siemens.ca<http://www.siemens.ca>