Dowtherm A

Brand: Dow

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DOWTHERM A Heat Transfer Fluid

DOWTHERM A, premium heat transfer fluid comprised of eutectic mixture of biphenyl (C₁₂H₁₀) and diphenyl oxide (C₁₂H₁₀), creating excellent temperature control for both liquid and vapor phase heating. Reliable, consistent heat transfer fluid for laboratory and industrial use with broad temperature range of 15°C to 400°C (60°F to 750°F) and handles pressures up to 152.5 psig (10.6 bar).

Key Features:

Stable at High Temperatures: Safe up to 400°C ensures long fluid life, minimizing degradation even in demanding applications.
High Flow, Low Viscosity: Easy pumping and start-up even at lower temperatures, improves overall efficiency of system.
Chemically Non-Corrosive: Does not deteriorate common metals preserving longevity and lifetime of equipment.
Dual Phase Operation: Safe for use with both liquid and vapor phase systems

Intended Applications:
DOWTHERM A is widely used in industries requiring precise temperature control for processes such as:

Pharmaceutical manufacturing: for precise heating in chemical reactors.
Plastics and polymer production: in processes like polymerization and extrusion.
Oil and Gas: is used to maintain controlled temperatures in processes such as refining, distillation, and thermal cracking. To find out if Dowfrost, Dowtherm, or Syltherm is most suitable for your oil and gas application see our guide sheet here
Chemical Processing: employed for precise temperature regulation in reactors, distillation columns, and condensers. Its ability to operate at high temperatures without degrading makes it ideal for processes like polymerization, alkylation, and synthesis reactions
Food processing: where indirect heating is critical for maintaining product integrity.
Concentrated solar power plants: for transferring heat to generate electricity.

This fluid is especially suited for heat-sensitive processes where both cooling and heating cycles are required. It delivers uniform, controlled heat transfer, essential in systems such as platen presses, reactors, and kettle jackets.

Benefits

Long Fluid Life
Excellent Heat Transfer
Low Operating Pressure
Wide Operating Temperature Range
Broad Product Line

Property

Value

Chemical Composition	Biphenyl (C12H10) and Diphenyl Oxide (C12H10O)
Operating Temperature Range	15°C to 400°C (60°F to 750°F)
Pressure Range	Atmospheric to 152.5 psig (10.6 bar)
Freezing Point	12°C (53.6°F)
Viscosity	- 0.7 cP at 300°C - 1.5 cP at 100°C
Vapor Pressure	- 3.96 psia (0.24 bar) at 400°F (200°C) - 152.5 psia (10.6 bar) at 750°F (400°C)
Specific Heat	- 2.3 kJ/kg·K at 100°C - 2.9 kJ/kg·K at 400°C
Thermal Conductivity	- 0.14 W/m·K at 100°C - 0.10 W/m·K at 400°C
Density	- 856 kg/m³ at 100°C - 746 kg/m³ at 400°C
Flash Point (SETA)	236°F (113°C)
Fire Point (C.O.C.)	245°F (118°C)
Autoignition Temperature	1110°F (599°C)
Lower Flammable Limit	0.6% (by volume) at 175°C
Upper Flammable Limit	6.8% (by volume) at 190°C
Thermal Stability	Maximum film temperature: 800°F (425°C)
Heat of Vaporization	409 kJ/kg at 12°C to 764 kJ/kg at 260°C

This product is intended to be utilized in a closed system, with a nitrogen blanket under positive pressure, and an expansion tank.

For more details see the technical product manual here

For a summary of the technical speciation's see the technical data sheet here

To review safety, handling procedures, and disposal see the safety data sheet here

For assistance in selecting the correct Dowtherm, Dowfrost, or Syltherm heat transfer fluid see the selection guide here or call or email us anytime at 888-999-7875 or [email protected]