Dowtherm A

DOWTHERM™ A from The Dow Chemical Company is a heat transfer fluid suitable for non-pressurized liquid phase systems with a maximum temperature of 550 °F (288 °C).

DOWTHERM™ A is a eutectic mixture of two very stable compounds

• biphenyl - C₁₂H₁₀
• diphenyl oxide - C1₂H₁₀O

with practically the same vapor pressures - suitable as a indirect heat transfer fluid for

• liquid phase systems - 15 ^oC to 400 ^oC (60 ^oF to 750 ^oF)
• vapor phase systems - 257 ^oC to 400 ^oC (495 ^oF to 750 ^oF)

Physical properties

• freeze point - 12 ^oC (56.6 ^oF)
• boiling point (atmospheric) - 257 ^oC (494.8 ^oF)
• flash point (SETA) - 113 ^oC (236 ^oF) 
• Fire point (C.O.C) - 118 ^oC (245 ^oF) 
• autoignition temperature - 599 ^oC (1110 ^oF)

• density (25 ^oC, 75 ^oF) - 1056 kg/m³ (66 lb/ft³)

Dowtherm A - Saturated Liquid Properties Chart

Vapor Pressure, Viscosity, Specific Heat, Thermal Conductivity and Density are indicated in the chart below: