Tin/Bismuth Alloy used to remove volatiles from substrate

We have had success in using low melting point alloys as a hot metal bath in the accelerated evaporation of volatiles from a substrate.

What we are most interested in learning is, what is the upper temperature range of an alloy that is 60% Tin and 40% Bismuth? Our supplier will only verify the Solidus and Liquidus values (281F/338F). What alloy changes can occur at higher than Liquidus temperatures?

We have to pump the alloy. What experiences can you share pumping 400F alloy?

ps I'm still waiting for my login conformation e-mail so I cannot monitor responses to this post directly. michael.hladilek@innomation.net