They remove the oxygen from the surface replacing it with nitrogen.
https://www.katom.com/vendor/lodge/lodge-heat-treated-cast-iron-dishwasher-safe.html
Our grandmother’s would roll their eyes in disbelief!
“Our grandmothers would roll their eyes in disbelief!”
LOL, my grandmother would wonder why they are bothering to replace the oxygen with nitrogen. I inherited a lovely ci skillet from her, smooth and shiny with a perfect polymer coating (seasoning).
I suppose Lodge is saying that you don’t need to create and maintain the classic seasoning now? Once that polymer is created and added to, it wouldn’t matter if there was nitrogen or oyxgen in the pan, would it?
They also say their pans are ‘pre-seasoned’, but when I look at a new lodge pan, I see a pathetic attempt at seasoning ;) It needs 4 or 5 more coats to actually be seasoned! (I just bought 2 pans at the Lodge outlet near us, and spent a day with them in my oven - and they are now beautifully black and shiny and ready to go!)
I guess I’m saying I don’t see the point. I wouldn’t put ci in my dishwasher any more than I would my wooden-handled knives. I don’t put pots in there either - they take up too much room; it’s just not efficient. I’m a bit weird when it comes to using the dishwasher. It only runs maybe once every 2 weeks.