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DOWTHERM™ A Synthetic Organic Heat Transfer Fluid — Liquid & Vapor Phase High-Temperature Thermal Fluid

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DOWTHERM™ A Synthetic Organic Heat Transfer Fluid — Liquid & Vapor Phase High-Temperature Thermal Fluid
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Features
Specifications
Color: Clear To Light Yellow
Flash Point: 236°F
Density At 25°C: 1.056g/cm3
Basic Infomation
Place of Origin: USA
Brand Name: DOWSIL
Certification: TDS,SDS,COA,Rohs
Model Number: DOWTHERM A
Payment & Shipping Terms
Packaging Details: 215.46kg
Delivery Time: 3-5
Payment Terms: L/C,D/A,D/P,T/T
Supply Ability: 1000
Product Description
1. Product Overview
DOWTHERM™ A is a synthetic organic heat transfer fluid from Dow, formulated as a eutectic blend of biphenyl (C₁₂H₁₀) and diphenyl oxide (C₁₂H₁₀O). Because both components have nearly identical vapor pressures, the mixture behaves like a single compound and is suitable for both liquid-phase and vapor-phase​ indirect heat transfer systems.
2. Key Benefits
Feature Description
Dual-phase operation Operates in both liquid and vapor phase for flexible system design
High thermal stability Excellent thermal stability up to 400°C (750°F)
Manageable vapor pressure Atmospheric boiling point 257.1°C (494.8°F) — controllable pressure in vapor-phase systems
Low viscosity at low temperature Easy start-up and pumping (viscosity ≈ 5.00 mPa·s at 15°C)
Near-azeotropic behavior Stable composition, easier maintenance
Clear to light-yellow synthetic fluid Compatible with common system metals per Dow engineering guidance
3. Typical Properties 
Basic Properties
Property SI Units English Units
Composition Diphenyl Oxide / Biphenyl Blend Diphenyl Oxide / Biphenyl Blend
Color Clear to light yellow Clear to light yellow
Freeze Point 12.0°C 53.6°F
Atmospheric Boiling Point 257.1°C 494.8°F
Flash Point¹ 113°C 236°F
Fire Point² 118°C 245°F
Autoignition Temperature³ 599°C 1110°F
Density at 25°C (75°F) 1056 kg/m³ 66.0 lb./ft.³
Average Molecular Weight 166.0 166.0
Estimated Critical Temperature 497°C 927°F
Estimated Critical Pressure 31.34 bar 30.93 atm
¹ SETA ² C.O.C. ³ ASTM E659-78
Saturated Liquid Properties (Selected)
Temperature Specific Heat Density Thermal Conductivity Viscosity
15°C / 60°F 1.558 kJ/kg·K 1063.5 kg/m³ 0.1395 W/m·K 5.00 mPa·s
205°C / 400°F 2.093 kJ/kg·K 902.5 kg/m³ 0.1091 W/m·K 0.38 mPa·s
355°C / 670°F 2.527 kJ/kg·K 742.3 kg/m³ 0.0851 W/m·K 0.16 mPa·s
Saturated Vapor Properties (Selected)
Temperature Vapor Pressure Latent Heat Vapor Density
255°C / 495°F 0.97 bar 297.4 kJ/kg 3.831 kg/m³
405°C / 760°F 11.32 bar 201.7 kJ/kg 45.17 kg/m³
4. Recommended Temperature Range
Operating Mode Temperature Range
Liquid Phase 15°C to 400°C (60°F to 750°F)
Vapor Phase 257°C to 400°C (495°F to 750°F)
Application:​ Indirect heat transfer
5. Typical Applications
  • Chemical & specialty chemical reactors, distillation columns (indirect heating)
  • Polymer & plastics processing (polymerization, extrusion)
  • Pharmaceutical process temperature control
  • Oil & gas heat exchange
  • Concentrated solar power (CSP) heat collection / storage loops
  • Environmental test chambers, high-temperature thermal control systems
6. FAQ
Q1: Is DOWTHERM™ A a single-phase or dual-phase heat transfer fluid?​
A: It can be used in both liquid-phase and vapor-phase systems. Vapor-phase heating is applicable above its atmospheric boiling point of 257.1°C (494.8°F).
Q2: The freeze point is 12°C — will it solidify in winter?​
A: Yes, it can freeze/crystallize. Outdoor or unheated systems require trace heating or insulation to avoid operation below 12°C (53.6°F).
Q3: The flash point is 113°C — is it dangerous?​
A: The flash point is higher than many mineral oils, but it is still a combustible organic fluid. Use in closed systems with nitrogen blanket and follow the latest MSDS/SDS.
Q4: How to choose between liquid phase and vapor phase?​
A: Choose vapor phase for isothermal latent-heat heating (reactors, jackets). Choose liquid phase for simpler circuits with combined heating and cooling requirements.

Ratings & Review

Overall Rating

5.0
Based on 50 reviews for this supplier

Rating Snapshot

The following is the distribution of all ratings
5 stars
100%
4 stars
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All Reviews

A
Azizul Ishak
Malaysia May 19.2026
Helpful (3)
item well packaged in box. Seller very responsive and professional on buyer concern. item was shipped very quick. Shipper Fedex very professional
P
P*t
Belgium Jun 7.2025
Helpful (7)
I was very happy with the cooperation. Good service.
M
M*v
Russian Federation Aug 10.2022
Helpful (16)
The silicone has nice property and was well packed. Very good.
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