Expert: stephen - 10/24/2009

Question
Help!  I am truly excited about this lesson I want to do with my high school art classes using a student made ceramic mold that has been bisque fired and kiln washed as a mold for slumping glass (I will spare you the artistic lesson details). I have read in this cress electric kiln owners manual that "Do not use ceramic bisque molds for sagging glass." Not to be a literalist, but is that the same thing as slumping and if it is what happens if I do go against their advice because the effects might be desirable, but I do not wish to damage this brand new kiln.  I have researched but have been unsuccessful in finding an answer.
Feeling stressed and needing the graduate credit for recertification I am time challenged.  (we just acquired this piece of equipment)  I would be so appreciative if you could direct me in a creative solution.  
Thank you,
Taylor

Answer
hi
I am no expert on glass slumping. I have friends in my studio that do it. I have seen them use normal earthenware unglazed garden pots for slumping glass. I think as far as the kiln is concerned, just make sure you have the shelves covered in case pot breaks and glass becomes stuck to the shelf. Old kiln fibre is good if you have any.
I am not too sure what sagging is, a guess would be slumping.
Temperature for slumping glass seems to be quite high? I am thinking that you would need to fire your mould higher than the highest temp you will be slumping.
If you are in no rush I can get in touch with my friends and ask them.
sorry I cant be any more help