There are two primary equations that I know of.  The first is more of a rule
of thumb and is based on an Arrhenius rate of reaction.  The second, which is
recommended, is the Eyring Model.  The IPC SIR Handbook (IPC-9201), which is
nearing publication, has a section detailing this equation.  It can also be
found in the original report of the Low Residue Soldering Task Force.  I
don't think it will come across well as an ASCII text message.  If  you will
give me a fax number or mailing address, I can send you the necessary
references.

Doug Pauls
CSL
[log in to unmask]

***************************************************************************
* TechNet mail list is provided as a service by IPC using SmartList v3.05 *
***************************************************************************
* To unsubscribe from this list at any time, send a message to:           *
* [log in to unmask] with <subject: unsubscribe> and no text.        *
***************************************************************************