The Truetech-brand Flameless Ration Heater uses 7.5 grams of a powdered magnesium-iron alloy, consisting of 95 % magnesium and 5 % iron by weight, and 0.5 grams of salt. Upon adding 30 milliliters of water, this mixture can heat a 230 gram meal packet by 100 °F in about 10 minutes, releasing approximately 50 kilojoules of heat energy at about 80 watts.[5]