Why do some flasks blow up during casting process?
This happens when flasks are not cured properly or the casting machine is not balanced. Another reason would be too many flasks in the oven without enough air (actually oxygen) to burn out the wax and plastic completely. Inadequate wax removal can be checked out by placing ceramic cones in the oven. The cones come to melt at different temperatures. If a cone to melt at oven’s final temperature does not bend, then the oven never reached the casting temperature. If the cone color turns GREEN then there was not enough air to complete the burnout and removal of wax and plastic.
