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Therminol VP-1 Vapor
Phase/Liquid Phase
Heat Transfer Fluid


Product Bulletin

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Product Description
Therminol VP-1 heat transfer fluid is a synthetic heat transfer fluid designed to meet the demanding requirements of vapor phase systems from 495 F to 750 F (257 C - 400 C) or liquid phase systems from 54 F to 750 F (12 C - 400 C). Performance features of Therminol VP-1 include:

  • Superb Heat Transfer Properties - Therminol VP-1 is a synthetic heat transfer fluid which combines exceptional thermal stability and low viscosity for efficient, dependable, uniform performance in a wide optimum use range of 54 F to 750 F (12 C - 400 C). Therminol VP-1 has the highest thermal stability of all organic heat transfer fluids.
  • Vapor Phase Heat Transfer Fluid - Therminol VP-1 is a eutectic mixture of 73.5% diphenyl oxide (DPO) and 26.5% biphenyl. It can be used as a liquid heat transfer fluid or as a boiling-condensing heat transfer medium up to its maximum use temperature. It is miscible and interchangeable (for top-up or design purposes) with other similarly constituted diphenyl-oxide (DPO)/biphenyl fluids.
  • Low Viscosity - Therminol VP-1 has a low viscosity to 54 F (12 C). Because of its crystallization point of 54 F (12 C), this fluid may require tracing in colder climates to avoid operational problems.
  • Temperature Control - Due to its ability to operate as a vapor phase heat transfer fluid, Therminol VP-1 is superb for use in heat transfer fluid systems requiring very precise temperature control.

Therminol VP-1 is used in a wide variety of industries, such as:
  • Fibers/Nylon Manufacture
  • Chemicals
For more information on Therminol VP-1 systems and applications e-mail us or contact the Therminol Technical Service Hotline at 1-800-433-6997.

Detailed Properties
Click here to download the product bulletin containing detailed physical and transport properties for Therminol VP-1.

Typical Properties

Therminol® VP-1
Vapor Phase/Liquid Phase Heat Transfer Fluid

Liquid Use Range 12 C to 400 C (54 F to 750 F)
Vapor Use Range 260 C to 400 C (495 F to 750 F)

Appearance Clear, water white liquid
Composition Biphenyl/diphenyl oxide (DPO) eutectic mixture
Crystallizing Point 12 C (54 F)
Moisture Content 300 ppm
Flash Point (ASTM D-92) 124 C (255 F)
Fire Point (ASTM D-92) 127 C (260 F)
Autoignition Temperature (ASTM D-2155) 621 C (1150 F)
Kinematic Viscosity, at 40 C 2.48 cSt
Kinematic Viscosity, at 100 C 0.99 cSt
Density at 25 C 1060 kg/m3 (8.85 lb/gal)
Specific Gravity (60 F/60 F) 1.069
Coefficient of Thermal Expansion at 200 C 0.000979/C (0.000544/F)
Volume Contraction Upon Freezing 6.27%
Volume Expansion Upon Melting 6.69%
Surface Tension in Air at 25 C 36.6 dyn/cm
Specific Resistivity at 20 C 6.4 x 10^11 ohm-cm
Average Molecular Weight 166
Heat of Fusion 97.3 kJ/kg (41.8 Btu/lb)
Minimum Vapor Temperatures for  

Fully Developed Turbulent Flow (Re = 10000)

10 ft/sec, 1-in tube

208 C (406 F)

20 ft/sec, 1-in tube

181 C (358 F)

Transition Region Flow (Re=2000)

10 ft/sec, 1-in tube

151 C (304 F)

20 ft/sec, 1-in tube

131 C (268 F)
Normal Boiling Point 257 C (495 F)
Heat of Vaporization at Max. Use Temp 400C 206 kJ/kg (88.7 Btu/lb)
Optimum Use Range, Liquid
12-400 C (54-750 F)
260-400 C (495-750 F)
Maximum Film Temperature 425 C (800 F)
Pseudocritical Temperature 499 C (930 F)
Pseudocritical Pressure 33.1 bar (480 psia)
Pseudocritical Density 327 kg/m3 (20.4 lb/ft3)

NOTICE: Although the information and recommendations set forth herein (hereinafter "Information") are presented in good faith and believed to be correct as of the date hereof, Solutia makes no representations or warranties as to the completeness or accuracy thereof. Information is supplied upon the condition that the persons receiving same will make their own determination as to its suitability for their purposes prior to use. In no event will Solutia be responsible for damages of any nature whatsoever resulting from the use of or reliance upon Information or the product to which Information refers. Nothing contained herein is to be construed as a recommendation to use any product, process, equipment or formulation in conflict with any patent, and Solutia makes no representation or warranty, express or implied, that the use thereof will not infringe any patent.


Therminol® is a registered trademark of Solutia Inc.

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