OK, but if you have never ever tied your laminate requirements to the 4101 (A, B, or C) in the first place, or forced your PCB fabricators to follow a specific slash, I am not sure what the importance of it is, or how to use it. There seem to be an awful lot of different slash sheets. I have seen some material datasheets for the raw laminate that mention meeting multiple slash sheets, which I don't understand, either. How can it meet so many different ones? We have usually mentioned much more generic specs. Maybe all my questions would be answered if I actually bought the IPC doc and read it, but I need to justify to my company to spend money on it, first. Genny -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Werner Engelmaier /* Sent: October 2, 2009 11:12 AM To: [log in to unmask] Subject: Re: [TN] IPC-4101B slash sheets Hi Genny, IPC-4101B is now obsolete with the publication of IPC-4101C.? This document provides the broad specifications for the various base materials available for PCBs; the various slash sheets are the specific specifications for a large variety of groups of base materials developed for different purposes. While 4101 goes a long way to describe the minimum requirements for each slash sheet group, the document and the slash sheets are not comprehensive enough for material specification per se. Thus, on the drawings for PCBs of the customers, more specific requirements need to be made than are available on the slash sheets. This has become particularly important for PCBs subject to Pb-free solder assembly and the much higher soldering temperatures required. For this reason, I have developed a white Paper giving my clients detailed recommendations for the specification of PCBs to survive Pb-free assembly. Regards, Werner Engelmaier Engelmaier Associates, L.C. Electronic Packaging, Interconnection and Reliability Consulting 7 Jasmine Run Ormond Beach, FL 32174 USA Phone: 386-437-8747, Cell: 386-316-5904 E-mail: [log in to unmask], Website: www.engelmaier.com -----Original Message----- From: Genny Gibbard <[log in to unmask]> To: [log in to unmask] Sent: Fri, Oct 2, 2009 1:00 pm Subject: [TN] IPC-4101B slash sheets I have never seen a copy of the IPC-4101B. I keep hearing talk of the slash sheets. I am not sure I understand what this spec is for or how to use it, and whether I should try to get a copy in our facility. Can someone give me a quick overview about this standard? Genny --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 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 15.0 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 15.0 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 -----------------------------------------------------