Kari, Per-Erik and others Process Characterisation Testing may now be achieved by the use of new SIR test protocols. In 2004, we expect to publish IEC-61189-5. I am hopeful that there will be a new IPC spec running concurrent. If you or anyone else would like a draft of this spec., then please let me know -- Regards Graham Naisbitt [log in to unmask] Cell: 079 6858 2121 Office: +44 (0)1252 813706 Concoat Limited - Engineering Reliability in Electronics Web: www.concoat.co.uk and www.concoatsystems.com > Kari, > > I'm afraid I don't have the time to expound on how to qualify the > manufacturing process, but I do recommend that you get a copy of IPC-HDBK-830, > "Guidelines for Design, Selection and Application of Conformal Coatings". You > can find much valuable information in that guideline. > > Per-Erik Tegehall > > -----Ursprungligt meddelande----- > Från: Kari Rambo [mailto:[log in to unmask]] > Skickat: den 11 september 2003 16:12 > Till: 'TechNet E-Mail Forum.'; Tegehall Per-Erik > Ämne: RE: [TN] Silicone conformal coating > > > Per-Erik, > > Any amount of information you would care to share regarding qualification of > the manufacturing process for conformal coating would be greatly > appreciated. > > Kari Rambo > > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Tegehall Per-Erik > Sent: Thursday, September 11, 2003 6:16 AM > To: [log in to unmask] > Subject: Re: [TN] Silicone conformal coating > > David, > > Visual requirements are not very useful for this purpose since you cannot > inspect beneath area array components and even when you have leaded > components you cannot incpect the backside of the leads. Furthermore, > "openings" my also form if field environments for example by blistering and > cracking of the coating. Therefore, in my opinion, you need to do some sort > of experimental verification that will show you that the coating gives > adequate protection during the expected life. That is difficut to do on a > product that will be sold to a customer. Thus, you should focus on > qualifying the manufacturing process rather than the finished product. > > How should you then do that? That is another question that would require a > very long answer. > > Per-Erik > > -----Ursprungligt meddelande----- > Från: David Douthit [mailto:[log in to unmask]] > Skickat: den 10 september 2003 15:08 > Till: TechNet E-Mail Forum.; Tegehall Per-Erik > Ämne: Re: [TN] Silicone conformal coating > > > Per-Erik, > > "(as long as you don't have opens in the coating)" This raises an > interesting question. Just exactly how > do you determine if there are "openings" (microscopic pinholes and/or > inadequate coverage of sharp edges and points)? > > Then, if you do determine there are, what is done about it? > > David A. Douthit > Manager > LoCan LLC > > --------------------------------------------------- > 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 > ----------------------------------------------------- > --------------------------------------------------- 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 -----------------------------------------------------