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My oven goes up to 550 Fahrenheit degrees and it seems the sheets I've found so far are safe up to 500-450°F. Are there concerns with potential chemical releases that buyers should be familiar with if cooking at 450-550°F?
Is lining the bottom with any specific material enough to protect food from the dangers of using cookware above the suggested safe thresholds?
Most good plain aluminum baking sheet will survive high temperatures like that, that's what restaurant use, they can take a beating, will last forever.
for example : https://www.bonappetit.com/story/just-buy-it-sheet-pan
Don't get a non-stick baking sheet.
If you really need something that will go to very high temperature, but might not be very practical, you could use a steep pizza "stone".
