THERMOSPEL VP HT-1™ is a premium long life synthetic heat transfer fluid designed to meet the demanding requirements of vapor phase systems or liquid phase systems. Synergistic combination of eutectic mixture of two very stable compounds with practically the same vapor allows it to function as if it’s a single compound. Thereby combines exceptional thermal stability and low viscosity for efficient, dependable, uniform performance in a wide optimum use range of 15° to 400°C (54° to 750°F)