Unlike electrically powered warming systems, the Deltaphase Isothermal Pad uses a thermodynamic phase-change process to deliver stable heat without electricity, wires, thermostats, or feedback controllers. Because it contains no electrical components, it produces no electrical signals or interference and cannot create ignition hazards in sensitive environments.
The pad contains a specialized chemical solution sealed within a durable pouch. At room temperature, the solution remains solid. When heated to approximately 39°C, the contents become fluid, activating the pad for use. Once an animal or cooler object is placed on the activated pad, the solution gradually returns to its solid state while releasing stored heat at a constant temperature.
This heat-releasing phase change is isothermal, meaning the temperature remains stable throughout the transition. During solidification, the pad releases more than 30 calories of heat per gram of solution while maintaining a near-constant temperature. The pad remains isothermal until the liquid phase has completely solidified, after which the temperature gradually declines.
The transition temperature is preset to 39°C, ensuring a gentle temperature gradient that promotes continuous heat transfer from the pad to the animal. This balances normal heat loss and helps maintain body temperature near physiological levels for extended periods.
