What kind of lunch box can be heated on the bright fire？

Only some specific materials can be heated on the light fire, such as the fresh -resisting glass, ceramic, cast iron, stainless steel and other lunch boxes. These materials have high heat resistance and can withstand higher temperature heating. 

However, it should be noted that even the lunch boxes of these materials need to follow some precautions when heating, such as avoiding sudden temperature changes, slowly heating up to avoid rapid changes in temperature, so as not to cause the temperature difference and cause rupture or rupture or rupture or rupture or rupture or rupture or cracking or rupture of the temperature Deformation and other issues. In addition, it is not recommended to use plastic and flammable materials such as plastic, rubber and other flammable materials to heat on the fire to avoid causing hidden safety hazards. Before heating, be sure to read the instructions of the manufacturer carefully and follow the correct heating method to use the lunch box.