Sheila,

Intermetallics are not a problem with this system, but if you used the
95SnSb5 for the reason that you want a higher melting temperature 235-240
versus the 179 deg C melting temperature for the Sn62 you may be defeating
the purpose as the melting point will be lowered and in localized areas will
be about 180 deg. C.  If you did not have a reason for using the Sn95Sb5
material to began with, why not use the Sn62 initially.  I have not seen any
improvement when cycling the Sn55Sn5 as compared to the Sn62; however, some
literature indicates a better life at higher temperatures for The Sn95Sn5.  I
have seen it most used for sequential soldering, where you do not want to
melt one joint while doing the other.

Phil Hinton

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