Graham, They could be the same Polyimide material,but /41 has a minimum 250 degrees C glass transition temperature requirement,whereas /40 is only 200 degees C. /40 is equivalent to old MIL-S-13949/10 -GI,GIN,GIJ,GIP,GIL /41 is equivalent to old MIL-S-13949/10-GIL,GIP Hope this helps. Dewey > -----Original Message----- > From: Collins Graham [SMTP:[log in to unmask]] > Sent: Thursday, September 25, 2003 9:12 AM > To: [log in to unmask] > Subject: [TN] prepreg classification > > Hello Folks! > A question for someone with knowledge of PWB laminant materials. I'm > sure IPC-4101 would tell me, but I don't have it. > > If I've ordered material per IPC-4101/40, and have received material > per IPC-4101/41, is the /41 material: > a) the same material but tested to a higher standard? > b) better than but a different material? > c) worse than? > d) some combination of these? > > I know the /40 is a polyimide material, I don't know what a /41 is. > > Thanks! > > regards, > > Graham Collins > Process Engineer, > Northrop Grumman Canada Corporation > Halifax > (902) 873-2000 ext 6215 > > --------------------------------------------------- > 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 -----------------------------------------------------