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

I think one of the concerns besides it possibly breaking is that if it has any unsealed areas, like those that tend to be at the bottom, it can absorb too much water. If you then go to use that ceramic piece in a hot oven or the microwave before that water has had enough time to really dry out (which can take longer than expected with glazed items) that water will quickly expand into steam which can shatter the item. I don’t know if this is true for everything, but I think I read this as a warning on my Corning-ware set I got a while back.