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 > >--------------------------------------------------- >Technet Mail List provided as a free service by IPC using LISTSERV 1.8e >To unsubscribe, send a message to [log in to unmask] with following text in >the BODY (NOT the subject field): SIGNOFF Technet >To temporarily halt or (re-start) delivery of Technet send e-mail to >[log in to unmask]: SET Technet NOMAIL or (MAIL) >To receive ONE mailing per day of all the posts: send e-mail to >[log in to unmask]: SET Technet Digest >Search the archives of previous posts at: http://listserv.ipc.org/archives >Please visit IPC web site http://www.ipc.org/html/forum.htm for additional >information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 >ext.5315 >----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ----------------------------------------------------- [This e-mail is confidential and may also be privileged. If you are not the intended recipient, please delete it and notify us immediately; you should not copy or use it for any purpose, nor disclose its contents to any other person. Thank you.] --------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8e To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/html/forum.htm for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 -----------------------------------------------------