- Water-activated chemical heater that are found with Meals, Ready-to-Eat (MREs).
US military specifications for the heater required that it be capable of raising the temperature of an 8 ounces (226.8 g) entree by 100 °F (56 °C) in twelve minutes, and that it has no visible flame.
The ration heater contains finely powdered magnesium metal, alloyed with a small amount of iron, and table salt.
To activate the reaction, a small amount of water is added, and the boiling point of water is quickly reached as the reaction proceeds.
Perfect for camping and survival