Also, washing a coated CCA is never a good idea, unless it is a localized, non-submersed wash process. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Yuan-chia Joyce Koo Sent: Friday, December 01, 2017 11:35 AM To: [log in to unmask] Subject: Re: [TN] board wash / non-washable modules - the dilemma since it is RF module, he might not have choice to conformal coat, unless he got OK from the designer... jk On Dec 1, 2017, at 12:21 PM, Ed Popielarski wrote: > Have you considered conformal coat the module, then hand solder with > OA & wash? > > > Regards, > > Ed Popielarski > Engineering Manager > > > 970 NE 21st Ct. > Oak Harbor, Wa. 98277 > > Ph: 360-675-1322 > Fx: 206-624-0695 > Cl: 360-544-2289 > > > "Nearly all men can stand adversity, but if you want to test a > man's character, give him power." Abraham Lincoln > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Graham Collins > Sent: Friday, December 01, 2017 9:09 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