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Old 12-04-2011, 03:46 PM
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Pete VanderLaan Pete VanderLaan is offline
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Join Date: Apr 2002
Location: Chocorua New Hampshire
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Get the fluorine out of the batch and things will do even better Rollin. I wasn't kidding.

I did put that thermocouple tube in to the door when I cast it and two nights back I did a cad sel melt. Today I looked at the handle on the door above where the tube is. There was about an inch of gassed off material built up on the underside of that handle. Quite a bit for one melt and that's just what stuck. The door port casting has a tiny glaze on it but almost nothing

Simply put, your furnace is under pressure. It will find a way out. If it's a fluoride gas mix, it will dissolve things as it passes through. I would bet it wasn't just moisture from the batch that ate your fiber. The Calcium fluoride had a lot to do with it.
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