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Heating plastic containers can seriously up your chances of chemical leaching, especially when temperatures rise above 25°C (77°F). When you put those containers in the microwave or oven, high temperatures can break down the plastic, causing harmful substances to seep into your food.
The following are for prepared food temperatures not heating it up and cooking it directly in the plastic.
Plastics like PET should not exceed 120°F to prevent antimony leaching into food.
Polypropylene (PP) is safe for hot foods up to 266°F with minimal leaching risk.
PLA melts and leaches harmful substances above 140°F, making it unsuitable for hot items.
High-density polyethylene (HDPE) is commonly used and can also withstand up to 120°F without significant leaching risks.
High-fat foods increase leaching risks when heated in plastics, especially at elevated temperatures.
Avoid heating containers made from PVC or those with recycling code 7 due to higher chemical leaching risks.