First step of the "burn out"....

To begin the "burn out" phase of the process, the flask is put into the kiln. To help in the "wax removal stage" the flask is positioned in the verticle plane with the pour cup down.  As the plaster absorbs the heat the wax begins to melt, and runs out the pour cup.  There is a metal tray under the flask to catch all the melted wax and funnel it out of the kiln. If the tray wasn't there the wax would ignite as the kiln got to the higher temperatures required in the burn out cycle.  The wax removal is done at about 400˚F. And the burn out, which is the process that burns off all the wax residue and preps the flask/investment for the pouring of the molten metal is done at 900˚F.