My kiln usually takes 10 hours to fire. I’m wondering why the last firing took 15 hours. I loaded more shelves this time. I fired tiles on shelves that were spaced an inch apart.
Loading a kiln more densely can increase the firing time. The extra mass inside the kiln requires more energy to fire the load. If the slower firing causes a digital controller to flash an error message, then program a slower firing rate.
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