It's cheap. Within any particular resin system, prepreg costs per sheet are essentially the same. So on a per unit thickness basis, 7628 prepreg is cheaper than any prepreg based on thinner glass. For instance if you need 0.028" thick you can do it 4 plies of 7628 or 6 plies of 2116. But the material costs for the 2116 will be about 50% higher becuase you are using 50% more plies. Mike McMaster RF Product Engineer Merix Corporation 503-992-4263 > ---------- > From: Brooks,Bill[SMTP:[log in to unmask]] > Reply To: TechNet E-Mail Forum.;Brooks,Bill > Sent: Friday, July 09, 2004 2:08 PM > To: [log in to unmask] > Subject: [TN] 7628 prepreg? > > Bill Brooks > PCB Design Engineer , C.I.D., C.I.I. > Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 > http://pcbwizards.com > > Why would a designer specify 7628 prepreg in the construction of a board? > What characteristics are unique to it? > Bill Brooks, CID > > --------------------------------------------------- > 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 -----------------------------------------------------