I have heard many times that in high humidity environments with very small amounts of condensing humidity, no clean flux can become re-activated. This paper discusses some options: https://link.springer.com/article/10.1007/s11664-014-3609-0 In my opinion, reach out to the part manufacturer and see if you can perform cleaning in a particular way to not risk having issues. Tom On Fri, Dec 1, 2017 at 1:05 PM, Robert Kondner <[log in to unmask]> wrote: > I would go for wash and bake but I worry that washing will "Wash Crud Into" > the shielded areas and the rinse will not rinse it out. > > Are your concerns about no clean flux in a marine environment really > justified or is it hog wash from somewhere? > > Bob K. > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins > Sent: Friday, December 01, 2017 10:09 AM > To: [log in to unmask] > Subject: [TN] board wash / non-washable modules - the dilemma > > Hello Technet! > > Wondering what other people are doing with this dilemma. > > We have had several customers design in pre-built RF modules on their > boards. I totally get why, it is a pre-built, FCC approved, easy solution > - > the fastest way to get a good Wi-Fi or bluetooth solution. > > Where things go off the rails for me are where this is used in a high > humidity application (e.g. a marine setting). We strongly prefer to wash > boards, we can build no-clean if needed but I'd prefer not to for an on the > water use. But the part a customer has designed in specifically says not > to > wash it (it has an EMI shield, so they are properly concerned with water > entrapment). > > So - would you: > > - build it no-clean? > - leave the part off, build and wash as usual, install RF module later > using no-clean? > - wash it (and maybe bake it to dry it out)? > - ???? > > -- > regards, > > Graham Collins > Senior Process Engineer > Sunsel Systems > (902) 444-7867 >