Will the investment “explode”?

by fredsias on June 27, 2010

On person inquired about whether there is any danger of the investment exploding when using the fast burnout process we have been discussing.

I have had only one occasion when the investment “exploded,” so to speak, and spread investment all over the inside of the burnout kiln. On that occasion a student had mixed his investment with improper proportions and the flask was filled with blobs of investment instead of a smooth pour with cream-like consistency. I speculate that, but cannot prove, that the lumpy investment left large cavities in the flask that trapped steam during the burnout. The steam probably blew out the investment when sufficient pressure built up. With a normal pour there are no cavities to trap steam so fast burnout usually works fine.

Are there any other experiences out there to add to this scenerio?

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