September 15, 2004

Thanks for the information and history lesson.  What happens in the world when all of us old folks are no longer here?

PS can you give me details on your book and where to purchase it?  Thanks
  ----- Original Message ----- 
  From: Brian Ellis<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Tuesday, September 14, 2004 1:55 AM
  Subject: Re: [TN] (2)PWB Conductive Contamination Under Solder Mask; What Can ...


  You must be aware that using abrasive brushing (Scotchbrite (R) or
  slurry) is a major cause of solder dewetting. Micro-particles of
  abrasive get implanted in the metal, which is even swaged over some of
  them. I have PROVED this time and time again. I published this in a
  paper 'New Aspects on the Solderability of Printed Circuits' in the
  Technical Proceedings of Inter/Nepcon '69, in Brighton, as well as in my
  book (pp. 76 ff). It is amazing that a problem that was identified 35
  years ago is still largely ignored! :-(

  Brian

  Susan Mansilla wrote:
  > Hi Mike and All
  > I am familiar with the abrasive wheel cleaning processes. but those are done
  > AFTER the tin/lead has been stripped.  The response I got indicated that the
  > abrasive was used on the Tin/Lead deposit, which didn't follow my idea of a
  > possible process flow.
  > Some PCB fab shops continue to use a "Scotch Brite" style of
  > abrasive wheel or brush as a final surface prep operation prior to
  > soldermask application.
  > Susan Mansilla
  > Robisan Lab
  >
  > ---------------------------------------------------
  > Technet Mail List provided as a service by IPC using LISTSERV 1.8e
  > To unsubscribe, send a message to [log in to unmask]<mailto:[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]<mailto:[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]<mailto:[log in to unmask]>: SET Technet Digest
  > Search the archives of previous posts at: http://listserv.ipc.org/archives<http://listserv.ipc.org/archives>
  > Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16<http://www.ipc.org/contentpage.asp?Pageid=4.3.16> for additional information, or contact Keach Sasamori at [log in to unmask]<mailto:[log in to unmask]> or 847-509-9700 ext.5315
  > -----------------------------------------------------
  >
  >

  ---------------------------------------------------
  Technet Mail List provided as a service by IPC using LISTSERV 1.8e
  To unsubscribe, send a message to [log in to unmask]<mailto:[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]<mailto:[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]<mailto:[log in to unmask]>: SET Technet Digest
  Search the archives of previous posts at: http://listserv.ipc.org/archives<http://listserv.ipc.org/archives>
  Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16<http://www.ipc.org/contentpage.asp?Pageid=4.3.16> for additional information, or contact Keach Sasamori at [log in to unmask]<mailto:[log in to unmask]> or 847-509-9700 ext.5315
  -----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a 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/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315
-----------------------------------------------------