When I was cooking today, I accidentally put the lunch box next to the gas stove. It was close to the fire. The high temperature led to a piece of the box cover, which melted a little and deformed. It took about two minutes. I took it away immediately. Will there be harmful substances left after the cover cools down? Can I continue to use it? If the cover can't be used, can the glass box still be used?

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After heating, toxic gas will be released, which will harm human health. Plastic is a high molecular compound polymerized by monomer as raw material through addition polymerization or polycondensation reaction. Its resistance to deformation is moderate. It is between fiber and rubber. It is composed of synthetic resin and fillers, plasticizers, stabilizers, and lubricants. It is composed of additives such as chemicals and pigments. Plastics are easy to burn and produce toxic gas when burned. For example, when polystyrene is burned, toluene is produced. A small amount of this substance can cause blindness, vomiting and other symptoms when inhaled. The burning of PVC can also produce hydrogen chloride toxic gas. In addition to burning, the high temperature environment will cause the plastic to decompose to toxic components, such as benzene.