Self-heating foods such as self-heating rice and self-heating hot pot are popular among the public because of their portability and simple use. Self-heating foods come with a heating pack. The main ingredients of the heating pack are roasted diatomaceous earth, iron powder, coke powder, activated carbon, salt, quicklime, sodium carbonate and other substances. After mixing and touching water, it will heat up immediately within 3-5 seconds, with a temperature of more than 150°C, a steam temperature of up to 200°C, and a heat preservation time of up to 3 hours.

Food heating pack manufacturers summarize the advantages of heating packs:

1. You can enjoy steaming hot meals comfortably in just a few minutes after pouring water into the lunch box.

2. There is no open flame, and it is not limited by the venue and time when eating.

3. After pouring water and starting self-heating, the surface temperature of the food can reach about 98°C.

4. Regardless of clean water or dirty water, only a little bit of food can be heated, and canned food comes with a water bag.

5. The calories of the food can meet the needs of medium and above military labor intensity.

6. It is rich in variety and nutrition, and can meet the different needs of tastes in the north and south.

7. The quantity is large, and each portion can be eaten by 1-2 people at the same time.

8. The military product is specially manufactured with preservative-free technology.

9. The lunch box can not only heat itself, but also keep warm for up to 3 hours.

10. The heater is small in size, high in thermal efficiency, and produces heat for a long time. It does not pollute the environment and is harmless to the human body.