Colleages in PCB industry, 

I am a process engineer new in this field, and I am currently searching 
for a mathematical formula (or a mathematical model), either physical or 
empirical, to calculate the accelerated aging factor for a new PCB surface 
finish, inside of a temperature/humidity chamber with constant temperature 
as T and constant relative humidity level as RH.  Thanks in advance for 
your help.

Nora Xiao
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