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Why did smoke...

Why did smoke come out of my ceramic fiber kiln the first time I fired it?

Updated on Aug 10, 2026

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The smoke that came off the kiln during the first firing is normal. It is the binders burning out of the fiber insulation.
When should the peephole plugs be left out during a firing? Why do you recommend firing a new kiln with only kiln furniture in it during the first firing?