I am building a vacuum casting setup that uses perforated flasks
and I am trying to find out the composition of the casting
gasket. Is it a ceramic fiber material or a high temperature
silicone or what?
As fasr as I can tell the gasket is a silicon rubber. It'll have
to be replaced sometime down the line, but what the heck, you
have to replace tires on the car too.
You might try the hardware store, The Ace Hrdw near me has
silicone rubber in 12" square sheets about 1/8" thick. I built
my vacumn caster & I used a corian plate with a silicon filled