Now, Now Joyce. One could imply by your response that you take offence. BG -----Original Message----- From: joyce [mailto:[log in to unmask]] Sent: Friday, July 18, 2003 6:05 AM To: [log in to unmask] Subject: Re: [TN] Exposed basis metal I guess I should wait until the "dear sir" answer it officially. Here is my un-official answer based on my understanding: Exposed copper on your roof will soon be green - corrosion Exposed solder, tin/lead HASL pad just like your old old copper water pipe used to solder together - much less corrosion Exposed gold, silver (hopefully, not really pure, add some other stuff) - much much less corrosion = that is why your wife want it as ring...(of course, you can put a copper ring, a solder ring and a gold or silver ring on someone's finger and wait for few years see what happened... Same thing!) I would be very upset if someone give me a copper ring as a body pH tester..... "Dear Sir" should give you better answer... For sure! jk >-----Original Message----- >From: TechNet [mailto:[log in to unmask]] On Behalf Of >August Chang >Sent: Friday, July 18, 2003 7:12 AM >To: [log in to unmask] >Subject: [TN] Exposed basis metal > > >Dear Sir, > >We bought one copy of IPC-A-610C, January 2,000 supersedes >rev:B, Dec .1994. I have got one simple question, but need >your clarification to see if my understanding is correct? > >In section 6.5.2 Exposed basis metal, Figure 6-41 shows a not >100% wetted pad on PCB land area, it only about 50% in my >point of view. > >Does this mean that the exposed base metal in unsoldered areas >should be considered normal as shown in the photo of Figure >6-41, just because it is OPS coated PWB. If so, would you also >tell me why? > >I would appreciate it if you could answer me ASAP. > >--------------------------------------------------- >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 -----------------------------------------------------