The heating package is non-toxic and does not come into direct contact with food. If the food container does not migrate and release toxic substances at high temperature, it is safe for food. Although the heating package of this kind of self-heating food is harmless to human health, it will burst if used improperly. If a large amount of water vapor accumulates in a closed environment, an explosion may occur.
The main components of the heating bag include sodium carbonate, iron powder, aluminum powder, coke powder and quicklime. As long as cold water is poured into the heating bag, the food box can be quickly heated to 150 degrees Celsius, and heat is released through chemical reaction.