Product review (1 stars): Not OVEN-SAFE to any degree.
I purchased this item (not at Amazon) a couple weeks ago. I followed the manufacturer's instructions carefully. I only used it a few times because the fumes it gave off was giving me a headache. I also noticed it turned white in the center even though nothing had spilled on it.  I removed it to inspect further and found my oven also had same white patch. So I proceeded to lightly clean liner with damp paper towel and it disintegrated. I unsuccessfully tried to clean it off my five year old oven with soapy sponge. I then resorted to the self-clean feature on the oven that I've never had to use before in my 50+ years. I am going back to tin foil. It actually works and hasn't harmed any of my ovens.