Why did my cheap baking sheet catch fire at 475 but my $30 one was fine?
I was roasting veggies on my cheap sheet pan I got for $4 from the dollar store, and at 475 the oil started smoking and actually flamed up. My buddy says it's because thin pans warp and create hot spots, and you should only use heavy ones like Nordic Ware. But my mom has used the same flimsy pan for 20 years and never had a fire. So is this a real safety thing or did I just get unlucky with a bad pan? Did I almost burn my apartment down for no reason?
Tbh a $4 pan is probably just super thin aluminum and at 475 with oil you're right at the edge of what it can handle, but that doesn't mean every cheap pan is a fire hazard. Hot spots are real on thin pans, but oil smoking and flaming up is usually about the oil itself hitting its smoke point, not the pan magically igniting. Your mom's pan survived 20 years because she probably never cranked it to 475 with a puddle of oil in it. You got unlucky with the combo of thin metal plus high heat plus oil, not some secret safety rule everyone's been hiding.