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:

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