Hi Iain,
Perhaps you have not seen some of my previous responses, but...
For reflow soldering, the time-above-Solidus is not an important number for
solder joint quality; you are not making solder joints at or just above
Solidus. However, time-above-(Liquidus+20C [if soldering to Ni you need
Liquidus+30C]) is very important and should be 3 to 5 seconds or longer.
Unfortunately, paste vendors have been misleading their customers for a long
time with this "time-above-183" nonsense, that is now spilling over into the
LF-arena.

Werner

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