When Good Molds Go Bad

WOW!

I've heard about the possibility of this happening, but never seen it with my own eyes.

Ladies and gentlemen, this is what happens to a resin-bonded sand mold when burned out at too high of a temperature. (The resin burns up and your mold is reduced back to sand). One poke at these and more sand just cascaded onto the floor. It was almost awesome in its total devastation. I mean, if you are going to screw up, do it big!

Actually, in this case no one screwed up, the kiln temp just isn't uniform throughout. We thought it could work for burn out molds, but it can't.

Oh, well. Live and learn.