Doing medical device packaging Blister box material selection PET and PETG, these two materials are all right?

Heat sealing is not a problem, PET is easy to whiten, but the price is low, when the temperature above 70 degrees easy to release carcinogens, PETG does not whiten, there are food-grade and medical grade certification, but the price is much more expensive than PET. If the domestic, the requirements are estimated to be not so high, foreign, especially in Europe and the United States market is estimated to require must be PETG.