Eric, Actually white thermal grease is known for migrating all over the place inside a housing or chassis over time... It's a messy process, if you put too much on it doesn't work right, it has the nasty habit of drying out over time and becomes a powder that fails thermally... there are a lot of undesirable traits in the use of the product... but it is still used... Sil-pads have been around for years and I have used them in high power designs as far back as 1980 and very successfully... they are clean, they have repeatable performance, they don't dry out, they don't migrate all over the inside of the housing... I recommend them highly, but you must do your thermal analysis and verify your results... intimate contact with the Sil-pad is very important. Best regards, Bill Brooks - KG6VVP PCB Design Engineer , C.I.D.+, C.I.I. Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510 e-mail:[log in to unmask] http://www.dtwc.com http://pcbwizards.com -----Original Message----- From: Joyce Koo [mailto:[log in to unmask]] Sent: Tuesday, January 11, 2005 6:25 AM To: [log in to unmask] Subject: Re: [TN] Thermal Compound vs. Sil-Pads you can always use diamond... if you are rich enough... http://www.aitechnology.com/thermal.html jk -----Original Message----- From: TechNet [mailto:[log in to unmask]]On Behalf Of Eric Kalgren Sent: Tuesday, January 11, 2005 9:04 AM To: [log in to unmask] Subject: [TN] Thermal Compound vs. Sil-Pads Good morning everyone! We have an issue that has come up dealing with sinking heat out of a resistor on one of our antennas. We are currently using thermal compound (Wakefield 120) between the resistor and the heat sink. However, we are ramping production up to full tilt and we'd like to use a precut thermal pad (like a sil-pad but a different brand name) to save some time on assembly. Have any of you used these in heat sinking. How do they compare to the goop that is heat sink compound? It is a 150W flange mount resistor by Florida RF labs spec'ed for a max temp of 150*C and a frequency range of DC-2GHz. Thanks in advance for your help Eric Kalgren Manufacturing Engineer Atlantic Microwave Phone: 978-779-7062 Fax: 978-779-0101 --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------