Thursday, 14 May 2009

Annealing open face castings

You should double the annealing time for open faced castings. The glass loses heat to the kiln from the open surface faster than through the bottom of the casting through the investment and any base that the casting is sitting on. If you could cover the open faced casting with an insulation of equivalent thermal value as the investment around the glass you could go back to the schedule for the actual thickness of the glass.