I got out an old tube of silicone kitchen & bath caulk. It was
completely hardened in the tube & out of curiosity I cut the tube apart.
It is interesting stuff: it is quite solid (i.e., holds together) &
about as hard as an eraser. It made me wonder if it could be used as a
molding compound. It didn't show any effect from molten zinc. But my
guess is that curing time would be excessive. Does anybody know if this
silicone can be used for molding? Is there a way to speed up curing
(additive or heat)?.
Once again RCM comes through! Thanks for all the good replies - the
voices of experience and of the chemistry.
The attractiveness of the silicone caulk is its availability and its
cheapness. I am reluctant to buy the 2 part compound because of its
expense and my very limited demand for it. If I could use the caulk, it
would be much more convenient. From the replies, it is something that
Another question: the solid piece that I recovered from the old tube
looked like it might make a good anti-vibration mounting. I'd say that
it would be more compliant than the hard-ish rubber mounts that I'm
familiar with (maybe a lot of compliance isn't a good thing?). Would it
stand up to long term vibration, without tearing apart? I'm talking
very little displacement, and machinery range frequency (1500 - 4000 Hz).