Signal Tech HTF 600 Fluid is a premium quality industrial grade non-toxic, non-corrosive, synthetic heat transfer fluid that is recommended for use in closed system or open system heat transfer applications, where a wide temperature range and environmentally safe fluid is required. Signal Tech HTF 600 fluidity at temperatures below -50°F and thermal stability up to 575°F permits its use over a wide range of conditions. Signal Tech HTF 600 Fluid is not significantly affected by long exposure to elevated temperatures, including transients to 1000°F.