Eli5: Why shouldn’t you put home made ceramics (a mug, for example) through the dishwasher? If they can withstand the heat of a kiln, surely a dishwasher is fine?

Question

I mean, I put them through the dishwasher sometimes anyway, but I’m told I shouldn’t? 🤷🏻‍♀️

In: 5331

Answer 1

Crazing (cracks in glaze) can occur in the dishwasher when the glaze and ceramic expand differently. Say the glaze expands less/slower than the ceramic and when the item swells it pushes on the glaze layer, breaking it. Hand washing subjects the item to less heat and thermal expansion.