Kiln casting

[Steve Lazer]

First off I hope all are well safe and remaining sane in this time of lockdown. I have a few questions on kiln casting, something I can do without studio access.

In creating a plaster mold I know Pete mentioned adding alumina to the plaster mold for increased strength. My first question is what type of alumina - tabular or carbonate or ....?

I will be looking at bomma cullet to cast with and am looking for additional guidance on kiln schedule for a very thick piece 8 inches in one dimension.

Thank you
Stay safe

Steve