Microwave
Microwave is a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter corresponding to frequencies between 300 MHz and 300 GHz respectively.
Nebraska study finds billions of nanoplastics released when microwaving containers - https://news.unl.edu/newsrooms/today/article/nebraska-study-finds-billions-of-nanoplastics-released-when-microwaving/ - EXPOSURE TO PARTICLES FROM BABY FOOD CONTAINERS KILLS UP TO 75% OF CULTURED KIDNEY CELLS