On 10 Feb 2005 13:18:11 -0800, wrote:
I'm not sure it'll fit the desired purpose very well, either.
Just because it's good at keeping very cold things very cold,
doesn't mean that the materials used for such will be good for
high temperature insulation as well.

The heat from the glory hole flame never makes direct contact with the
metal. You line the inside with an insulating material(frax). You can
use a little as a metal trashcan. In this case, the glass work being
done needs an opening larger than a trashcan can provide.

Gotcha. I guess that makes sense, but I'm still not convinced that just
because something is good for cold, it'll be good for heat. As an
extreme example, styrofoam wouldn't make the transition real well. I don't
know how perlite or mylar do at high temps, or what the temp there is.