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