Hi Ted, Here are the pertinent fact about the materials: Isola IS410 Tg=170, Td=350, TE(50->260)=3.5%, STII=225 Nelco N4000-11 Tg=170, Td=345, TE(50->260)=3.2%, STII=225 Nelco N4000-12 Tg=180, Td=370, TE(50->260)=3.6%, STII=239 N4000-29 Tg=175, Td=350, TE(50->260)=3.0%, STII=232 Generally, the higher the STII the better the material is for LF-soldering temperatures. Werner --------------------------------------------------- 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 -----------------------------------------------------