Hi,
in our homegrown glory furnace or melting hole we want to try a different melting pot. The first one is still functioning, but actually is a mass of sherds kept together by molten glass, and we are looking for the next experiment. Still, we have had one month and a half of blowing two times each week, cooling down and heating up anew every time, and with reasonably good glass quality.
I am not quite certain what material the old pot is, but it certainly was not built for the goal taht we used it for.
Xandra poured a new pot from Basacast (kind of concrete that can stand up to 1750 Celsius) and plans to heat it slowly to 1200 Celsius in our annealing oven (and old electrical pottery kiln) before putting it in the glory hole.
I would like to hear from others who have been experimenting with the casting of melting pots, and of precautions that we should take.
Of course I will report back to the community :-)
Paai