I am not sure yet, but i dont think all or much parchment paper has coatings. From what i have read some has a silicon coating, but i have still not seen any evidence of ptfe coated parchment paper. but on that subject, oil slick says ptfe is good to 500degrees, so it should be fine for around 300 shouldn't it? I have organic parchment paper as well as two other kinds. I dont believe there are plastics on them, but i will do research, thanks for your concern