Hi Steve,
Even that is not the whole story. In J-STD-020 & 033, MSL levels are
established. however, no differentiation is made as to the difference in the soldering
temperatures for SnPb-soldering and LF-soldering. The MSLs mean different
things depending on the soldering temperature, since at higher temperatures the
same moisture level will result in higher vapor pressures and thus more
destructive forces. Thus, some sort of de-rating system, i.e.,
MSLx(SnPb)=MSL[x+2](LF); thus, e.g., MSL3(SnPb)=MSL5(LF), needs to be developed.

Werner

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