Does anyone have any experience bonding ferrite cores? I am working on developing a process for bonding an e-core to an i-core. They are 0.8" x 1.2" and sandwich the winding in the pwb. So the bond must be done once the assembly is populated. I'm applying a high viscosity epoxy, but it can be difficult to control. I attempted a 0.002" epoxy preform, but the outcome was reduced inductance, so we are still using the high viscosity epoxy. Why would they result in such different inductance properties? In either case, the cure time at 250°F is 1 hour and production is requesting a material which has a very short cycle time. Steve Shoda BAE SYSTEMS Controls --------------------------------------------------- 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 -----------------------------------------------------