My understanding is that solder mask got dense structure than the
underlying polymeric material (relatively porous compare to the
soldermask). You will need solder mask to prevent flux/cleaning
solution/ contaminants to be trapped in the board material. Of course,
this is in addition to the antiwetting of solder itself provided by the
solder mask (as the name called).
As usual, just my 1.28 cents (exchange rate went up a bit... I guess my
input got few more cents now than a month ago...;-).
jk
>-----Original Message-----
>From: TechNet [mailto:[log in to unmask]] On Behalf Of
>[log in to unmask]
>Sent: Thursday, February 06, 2003 7:54 PM
>To: [log in to unmask]
>Subject: Re: [TN] Soldermask
>
>
>Good question, Siggi - no answer! (Sorry, I'm feeling
>facetious this morning).
>
>I would guess that it's a question of adhesion of the mask to
>the board. If only the traces are masked then there would be
>miles of 'edges' where the mask ends and the board surface
>resumes - edges that can be damaged, delaminated, etc.
>
>Or it may just be tradition, or aesthetics.
>
>Peter
>
>
>
>"Zweigart, Siegmund" <[log in to unmask]>
>06/02/2003 09:58 PM
>Sent by: TechNet <[log in to unmask]>
>
>Please respond to "TechNet E-Mail Forum."; Please respond to
>"Zweigart, Siegmund"
>
>
> To: [log in to unmask]
>
> cc: (bcc: DUNCAN Peter/Asst Prin Engr/ST
>Aero/ST Group)
> Subject: [TN] Soldermask
>
>
>
>
>
>
>
>
>
>
>
>
>I have a simple question but never got an answer.
>
>Why is solder mask on the complete board, not just on the
>traces? Because of: Screen printing Tradition ??
>
>
>Any Input?
>
>Siggi
>---------------------------------------------------------------
>-------------
>
>-
>Kind regards / Mit freundlichen Grüßen
>
>Dr. Siegmund Zweigart
>New Technology Manager
>
>Solectron GmbH
>Solectronstrasse 2 Fon. ++49 7032 998 194
>D - 71083 Herrenberg Fax ++49 7032 998 222
>
>e-mail: [log in to unmask]
><mailto:[log in to unmask]>
>internet: www.solectron.com <http://www.solectron.com>
>---------------------------------------------------------------
>-------------
>
>-
>
> ----------
> From: Martyn Gaudion
>[SMTP:[log in to unmask]]
> Sent: Donnerstag, 6. Februar 2003 14:21
> To: [log in to unmask]
> Subject: Re: [TN] Here is a Primer on PWB fab
>
> Dear Technetters,
>
> After Jim's question on a PCB fabrication primer, I was
> swamped with requests for Polar's introductory
> presentation - which goes through the basic steps
> involved in building a 6 layer board.. So if you
> would like a copy (your customers in the PCB assembly
> industry may like to see it )... you can find the
> presentation as AP166 in the What's New section
> on this page:
>
> www.polarinstruments.com/support/cits/cits_index.html
>
> Kind regards
> Martyn Gaudion
> www.polarinstruments.com
>
>
> At 17:54 05/02/2003, you wrote:
> >Anyone know of a good primer (for a student intern)
>on how PWBs are built;
> >say a web based one from a board show so that she can
>understand how PWBs
> >are buitl?
> >
> >One on assembly/soldering would be good too.
> >
> >Jim
> >
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