Hi Ed! The Specific Heat Capacity of Sn60/Pb40 is 150 J Kg(superscript: -1) K(superscript: -1) and the its Latent Heat of Fusion is 37 KJ Kg (superscript: -1). You should be able to make your calculation using these values plus don't forget to add into the equation the solderpot specific heat contribution. Good Luck. Dave Hillman Rockwell Collins [log in to unmask] Ed Popielarski <[log in to unmask]>@ipc.org> on 10/07/2002 10:56:25 PM Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond to Ed Popielarski <[log in to unmask]> Sent by: TechNet <[log in to unmask]> To: [log in to unmask] cc: Subject: [TN] Solder melt energy coefficient Hi all, Does anyone know the energy (BTU, Watts, HP, etc.) required to raise some amount of SN63 solder (lbs, kg, etc.) some thermal unit (deg. F or C) in an amount of time (min, hours, etc.)? Now to make the question even more "anal" (pardon my moonish term) how about the energy to go through phase transition? Have I been thinking about wave soldering too much? Probably so, but I need this info to determine the correct kW values to heat an "N lbs" pot in "X" time (a customer requirement). Regards, Ed Popielarski QTA Machine 10 Mc Laren, Ste Irvine, Ca. 92618 Phone:949-581-6601 Fax: 949-581-2448 Cel: 949-337-2578 WWW.QTA.NET --------------------------------------------------------------------------------- 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 ---------------------------------------------------------------------------------