ArtMetal

Roy,

I may just have been lucky, but all I've ever done with my graphite crucubles is put them in the burnout kiln and bring them up to about 600F and hold them there for anb hour or so and then bring the kiln up to around 1200-1500F and shut it down. I let it cool down to room temp with the door closed, which takes about ten hours or so. That's it.

I was told many years ago in school that the crucible should be dusted with flux while it's at the 600F temp and let it glaze the inside of the crucible when it comes up to heat. I think I did that with my first crucible, and then forgot with the next few. It didn't seem to cause any issues, but I'm only reporting my observations, not making any recommendations.

Rich