Thread: corking molds
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Old 11-18-2019, 07:41 AM
Monte Becker Monte Becker is offline
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Aluminum hernia

The theory is hearsay. The facts support it...

I understand that the skin of aluminum is aluminum oxide, which melts at a higher temperature then "pure aluminum" (??) on the inside of the mold. The idea is that the inside becomes a liquid at a lower temperature than the outside.

Someone took my aluminum mold and brought it up to 900F. It did indeed have a hernia (spludged out the side and made a 1"x3"x1/4" puddle). The business part (the inside) and the outside look and appeared fine.

But one has to wonder if the internal void will ever cause me trouble. So far, so good...
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