Plastic bowls can withstand high temperatures of up to 140°C and are suitable for direct microwave heating. However, a study published in the journal *Environmental Science & Technology* in July 2023 found that microwaving food-grade plastic containers for three minutes can cause them to release over 2 billion nanoplastics and 4 million microplastics per square centimeter. Therefore, it is best to avoid using plastic containers-even food-grade ones-to heat food in the microwave.
Avoid using them to hold boiling hot or acidic foods. Storing hot food (especially at temperatures exceeding 60°C), as well as acidic or greasy foods, can accelerate the leaching of harmful substances (such as phthalates and heavy metals) from the plastic.
When microwaving, remove the plastic lid to prevent it from warping due to high-temperature steam.
When serving hot food, it is preferable to use materials with greater stability, such as underglaze-decorated ceramics, tempered glass, or stainless steel (e.g., 304 or 316 medical-grade).
Replace plastic bowls promptly if scratches appear (e.g., more than three scratches), as damaged surfaces increase the risk of harmful substances leaching into the food.