Chris, we use this simple method for checking cleanliness. Cheap. Simple. Good enough to us. Nothing wrong with academics, don't misunderstand, but academics can sometimes be blind to simple ways. I love simplicity. Albert did too...he-he http://www.ipc.org/4.0_Knowledge/4.1_Standards/test/2.6.13.pdf Inge ----- Original Message ----- From: "Chris Ball" <[log in to unmask]> To: <[log in to unmask]> Sent: Thursday, September 14, 2006 2:16 PM Subject: Re: [TN] bareboard cleanliness related to surface finish > Hello Inge- > > I asked because we are changing over to a new bareboard supplier for > several different products. Actually, several different divisions within > the company are moving a single product each to the new supplier. These > are > all mature, already in production parts. The previous shops either had no > problem meeting the spec., or didn't meet it but we didn't know. The new > shop is asking for exceptions to the requirement, and all the requests > funnel back here. > > I see that they request different levels for different products. Sometimes > different levels for the same product on different days, but that's > another > email.... > > When I showed them an earlier request for a lower level they told me it > was > due to the different surface finish. That was a new thing to me, so I > checked with the experts. > > So, not trying to split a whisker, and not even a psuedo-academic. Some of > the other questions, concerns, and exceptions from the shop have made me > generally suspicious. Maybe these are delay tactics. Just checking. And > trying to get a little smarter at the same time. Reading this forum is > pretty educational, IMHO. I appreciate the responses and apologize for not > taking the time to research the archives first, but as a > not-even-psuedo-academic, I usually follow the easiest path to > enlightenment. ;-/ > > Best Regards, > -Chris > > > > > > "Ingemar Hernefjord > \(KC/EMW\)" To: "TechNet > E-Mail Forum" <[log in to unmask]>, Chris > <ingemar.hernefjord@ericss > BALL/AuburnHills/VSDS/VALEO@VALEO > on.com> cc: > Subject: RE: > [TN] bareboard cleanliness related to > 09/14/2006 02:52 AM surface finish > > > > > > > > Chris, > > Why do youi put the question? I've never heard about practical > in-field-use problems based on ionic level diff between the two > treatments. Never. Academics can always find hair cleaving topics, but > we working with design production and marketing are more interested in > the question "do they work?" > > Inge > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Chris Ball > Sent: den 12 september 2006 20:19 > To: [log in to unmask] > Subject: [TN] bareboard cleanliness related to surface finish > > Hello Gurus- > > Is it fair to expect a higher contamination on a HASL finished bareboard > than, say ENIG? I would have expected the same level of cleanliness when > receiving the bareboards, but new supplier says they have different > levels for different finishes. > > We specify tighter than std. IPC levels and never varied the spec due to > surface finish. Requests for exceptions have been rare and not related > to surface finish. > > Any comments appreciated, > -Chris > > > "This e-mail message is intended only for the use of the intended > recipient(s). > The information contained therein may be confidential or privileged, and > its disclosure or reproduction is strictly prohibited. > If you are not the intended recipient, please return it immediately to > its sender at the above address and destroy it." > > --------------------------------------------------- > 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 > 847-615-7100 ext.2815 > ----------------------------------------------------- > > > > > > "This e-mail message is intended only for the use of the intended > recipient(s). > The information contained therein may be confidential or privileged, and > its disclosure or reproduction is strictly prohibited. > If you are not the intended recipient, please return it immediately to its > sender at the above address and destroy it." > > --------------------------------------------------- > 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 > 847-615-7100 ext.2815 > ----------------------------------------------------- --------------------------------------------------- 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 847-615-7100 ext.2815 -----------------------------------------------------