Victor,
You should read IPC-HDBK-840. It will answer all of those questions.
I just finished qualifying a rework soldermask, which is why I know it would be helpful to you.
It deals with soldermask in terms of dielectric properties, BGA solderball extrusion for soldermask-defined pads, types of soldermask most appropriate for Automotive, Aerospace, Telecomm, Consumer, and even Underseas applications, both from a military and down-hole perspective (all of these have completely different requirements in terms of material properties, especially dielectric and CTE factors). Even the Underseas applications for signal processing equipment, telecomm, power, and down-hole drilling equipment have huge differences in requirements. The soldermask needs to be able to match the PWB qualities and characteristics. Soldermask and subsequent processes are completely different (usually) for an ENIG finish versus an IAg finish versus an OSP finish. They all have different surface activity, so that is another consideration when looking at CCAs that have a lot of underbonded, cornerbonded, staked, or encapsulated components (or even just one critical component!). There is helpful information on RoHS, WEEE, and Environmental issues, compatibility with all of the various fluxes and cleaning and process chemistries, etc. It includes information on challenges for High Frequency and Ultra-High Frequency design, thermal dissipation factors, high operating temperature situations, Pb-free processing and effects, compatibility with legend and marking inks, rigid-flex and flex applications, and different Types of maskant (thermal cure, UV, LPI, dry, etc.)

I urge you to obtain a copy. I think its $35.00. It may not make the New York Times bestseller list anytime soon, but I have yet to find a sure cure for insomnia with absolutely no side effects at that price.

Odin

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Joyce Koo
Sent: Monday, October 05, 2015 11:53 AM
To: [log in to unmask]
Subject: Re: [TN] Solder mask type versus raw board/card finish

flux contamination and other ionic contamination.... wetting characteristic, etc. etc. etc.
> Now, I understand that there are many solder mask vendors globally.   What
> I am not clear on is why does raw card surface finish impact SM
> performance.   Besides adhesions properties and HDI.   Any comments and/or
> papers out there...
>
> Victor,
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
> Sent: Friday, October 02, 2015 10:19 AM
> To: [log in to unmask]
> Subject: Re: [TN] Solder mask removal, SMOBC
>
> Yes, and they would have the proper environmental controls and safety 
> equipment, etc.
> Even if you attempted to remove it using a conformal coat blaster, you 
> still have the safety issues to deal with. You don't want to breathe 
> that stuff.
> Excuse me while I go outside for a cigarette.
> Odin
>
> -----Original Message-----
> From: Ed Popielarski [mailto:[log in to unmask]]
> Sent: Friday, October 02, 2015 10:16 AM
> To: TechNet E-Mail Forum; Stadem, Richard D.
> Subject: RE: Solder mask removal, SMOBC
>
> In addition to Richard's sage advice and rationalization is the fact 
> they are set up to deal with harsh chemistry like this and probably do 
> so on a regular basis.
>
> Ed Popielarski
> Engineering Manager
>
>
> 970 NE 21st Ct.
> Oak Harbor, Wa. 98277
>
> Ph: 360-675-1322
> Fx: 206-624-0695
> Cl: 949-581-6601
>
>
>
> "It's one kind of victory to slay a beast, move a mountain, and cross 
> a chasm, but it's another kind altogether to realize that the beast, 
> the mountain, and the chasm were of your own design."
> https://maps.google.com/maps/myplaces?hl=en&ll=48.315753,-122.643578&s
> pn=0.011188,0.033023&ctz=420&t=m&z=16&iwloc=A
>
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
> Sent: Friday, October 02, 2015 5:36 AM
> To: [log in to unmask]
> Subject: Re: [TN] Solder mask removal, SMOBC
>
> Perhaps you can ask your board fabricator? I would imagine they have 
> methods for doing this. Perhaps also they may be able to do it for you 
> cheaper than you could set yourself up to do it? Doesn't hurt to ask.
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
> Sent: Friday, October 02, 2015 6:52 AM
> To: [log in to unmask]
> Subject: [TN] FW: Solder mask removal, SMOBC
>
> Fellow TechNetters:
>
> I did not receive very much feedback on my initial inquiry. Therefore, 
> I ask again. Additionally I also ask if Solder mask and conformal 
> coating the same Product/Term (IPC-7711.21 section 2.3.1. I want to 
> removal/strip solder mask. At this point I do not known the solder mask vendor or type.
>
> Victor,
>
> From: Hernandez, Victor G
> Sent: Thursday, October 01, 2015 10:56 AM
> To: TechNet E-Mail Forum
> Cc: Hernandez, Victor G
> Subject: Solder mask removal
>
> Fellow TechNetters:
>
> I have been asked to see if that is a satisfactory method for 
> removing/stripping solder mask from sample coupons chemically and/or 
> mechanically.
>
> Victor,
>
>
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