Howard, Would you provide me with more information like: 1. How long you have been using Thermabond? 2. What is the life expectancy of the application (i.e., will the Thermabond still be adhering the heatsink to the pwb near end-of-life?)? 3. What environmental conditions (temp & humidity extremes) will the Thermabond be exposed to? Any info in this area would be quite helpful. Thanks, Mike Adams Lucas Aerospace [log in to unmask] (216)995-1195 x3058 > ---------- > From: Howard Feldmesser[SMTP:[log in to unmask]] > Sent: Thursday, October 16, 1997 4:24 PM > To: [log in to unmask] > Subject: Re: [TECHNET] Heatsink lamination > > Marty, > We've had very bad luck with bonding heatsinks with prepreg, > most > often resulting in a board that looks like a potato chip. Several > years > ago we switched to Arlon's Thermabond with great success. We've > launched > several satellites with bonded on heatsinks and all are still > functional, a > true test of surviving rigorous use. > Howard Feldmesser > The Johns Hopkins University Applied Physics Laboratory > > At 2:54 PM 10/16/97 -0400, Sheppard, Marty - LYPME wrote: > >We are attempting to attach a nickel-plated copper heatsink to a 10 > >layer PWB per a set of manufacturing drawings that only states that > "the > >heatsink shall be attached with prepreg". It does not call out a > >pressure, temperature, cycle time, or a type of prepreg. We have > >assumed that we would need a "low-flow" type of prepreg. We have > tried > >some sample cards with a low-flow prepreg (PC-GF 108V by Westinghouse > >Fortin) that we have on hand; we have had good registration of the > >heatsink to card, but the adhesion has not been as good as we would > have > >liked, and the heatsink seems to have been pressed "into" the board > (you > >can feel the outline of the heatsink on the backside of the card). > We > >ran the press at the lowest possible pressure we can for our press > (15 > >lbs). > > > >We are looking for suggestions from anyone who has experience with > >laminating heatsinks to PWBs. > > > >Thanks, > > > >Marty W. Sheppard / LYPME > >Manufacturing Engineering Support > >(912)-926-9632 DSN 468-9632 Fax: (912)926-7974 > >email: [log in to unmask] > > > >############################################################## > >TechNet Mail List provided as a free service by IPC using LISTSERV > 1.8c > >############################################################## > >To subscribe/unsubscribe, send a message to [log in to unmask] with > following > >text in the body: > >To subscribe: SUBSCRIBE TECHNET <your full name> > >To unsubscribe: SIGNOFF TECHNET > >############################################################## > >Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > additional > >information. > >For the technical support contact Dmitriy Sklyar at [log in to unmask] or > >847-509-9700 ext.311 > >############################################################## > > ############################################################## > TechNet Mail List provided as a free service by IPC using LISTSERV > 1.8c > ############################################################## > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > To subscribe: SUBSCRIBE TECHNET <your full name> > To unsubscribe: SIGNOFF TECHNET > ############################################################## > Please visit IPC web site (http://www.ipc.org/html/forum.htm) for > additional information. > For the technical support contact Dmitriy Sklyar at [log in to unmask] or > 847-509-9700 ext.311 > ############################################################## > ############################################################## TechNet Mail List provided as a free service by IPC using LISTSERV 1.8c ############################################################## To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TECHNET <your full name> To unsubscribe: SIGNOFF TECHNET ############################################################## Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information. For the technical support contact Dmitriy Sklyar at [log in to unmask] or 847-509-9700 ext.311 ##############################################################