Packaging that can automatically heat food is increasingly entering the consumer market, being used in emergency relief efforts, and finding demand among outdoor enthusiasts, according to infohub.kz.
Previously, such solutions were used primarily in flameless food heaters for military Meals Ready-to-Eat (MREs) in the United States. However, demand for civilian products is growing rapidly: the market for self-heating meal containers in China exceeded $460 million as early as 2019 and continued to grow during the COVID-19 pandemic.
The technology relies on exothermic chemical reactions triggered by adding water. Most commonly, systems based on quicklime (calcium oxide), magnesium-iron alloys, or aluminum compounds are used. To prevent excessive overheating, researchers are incorporating phase-change materials (PCMs) that absorb excess heat as they melt and stabilize the temperature. The container design ensures complete isolation of chemical reagents from food products.
Despite the convenience, the technology faces several limitations. The reagents form alkaline residues with high pH levels (from 9 to 11), posing disposal risks. Additionally, heating accelerates the migration of phosphate esters and other chemical components from plastic into food. In the future, manufacturers plan to switch to biodegradable materials and integrate smart sensors to monitor food freshness and temperature.