2, plastic lunch box: plastic material, only PP material is high temperature resistant, so only PP material can be put into the microwave oven, other materials are not heat resistant, so it can not be put into the microwave oven! Classification of plastics Different numbers indicate different materials. The triangle surrounded by three arrows indicates that food-grade plastics are used. The "5" in the triangle and the "PP" below the triangle indicate that the product is made of polypropylene (PP). The material is safe, non-toxic, and most importantly, it has excellent high temperature resistance and stable performance, so it is a plastic material that can be put into a microwave oven.
3, glass lunch box: inside the glass material, most of the glass material can withstand high temperature, at least the temperature of the microwave oven is no problem, just pay attention to the kind that the heating time can not be particularly long!
4, ceramic lunch box: ceramic materials, most of the ceramic materials can also resist high temperature, and ceramic materials are more resistant to high temperature than other materials, so the most important thing is to pay attention to his use!