I can't answer you as to safety, but here is what I do. I use the big, big rolls that are sold at Costco-BJ's for general use & not touching any food. I don't use this kind for covering bowls at all in the microwave. (As an example, I will cover a bowl of rising dough in this wrap. I will put a large piece down on the counter when I wish to avoid a large clean-up. And I will sometimes cover a bowl of food that goes into the refrigerator overnight.)
For wrap that may touch food, fatty or otherwise, I use "Glad" ClingWrap (Crystal Clear Polyethylene). It says on the box that it "Clings Tight," but it doesn't cling like the big roll wrap does. I don't use this kind either for covering bowls at all in the microwave. I have stopped wrapping cheese in this wrap and have instead started wrapping my cheese in butcher paper and putting it into a freezer type bag. (It actually keeps better for me this way.)
Chunky Cod StewChunky Cod Stew 2 Red Bell Peppers halved and deseeded 3 Tbsp olive oil devided 1 onion chopped finely 2 garlic cloves chopped very finely 1...
I have seen cooks on TV that will actually wrap food in clinging wrap and cook in the microwave, and other various ways. I, myself, would never do this. I can't recall my research that brought me around to this way of using plastic wraps, but it is as safe a way I know of using these products. HTH, Dee