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Therminol 66
Heat Transfer Fluid


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Product Description
Therminol 66 is the world’s most popular high temperature, liquid phase heat transfer fluid. Suitable for operation up to 650 F (345 C), Therminol 66 is pumpable to 27 F (-3 C) and delivers exceptional performance. Consider the following:

  • Experience - Therminol 66 is the most popular high temperature liquid phase heat transfer fluid in the world. No heat transfer fluid material in the world has a higher degree of customer satisfaction than Therminol 66.
  • Proven Fluid - In a wide variety of applications and thousands of systems around the world, Therminol 66 delivers superior performance. When your heat transfer fluid system is not operating, then your process is not operating either. Do not settle for second best. In critical applications, Therminol 66 is the only choice.
  • True 650 F (345 C) Performance - Therminol 66 sets the performance standard for high temperature liquid phase fluids. Users can expect many years of reliable, trouble-free operation, even when operating continuously at the recommended maximum temperature of 650 F.
  • Fouling Resistant - Therminol 66 is specifically engineered to resist solids formation and system fouling. Your system will operate more reliably and you will save money.

Applications
Therminol 66 is used in a wide variety of industries, such as:
  • Chemicals
  • Plastics
  • Biodiesel
For more information on Therminol 66 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 66.

Typical Properties

Therminol® 66
Heat Transfer Fluid


Operating Range 0 C to 345 C (30 F to 650 F)

Appearance Clear, pale yellow liquid
Composition Modified terphenyl
Moisture Content, Maximum 150 ppm
Flash Point (ASTM D-92) 184 C (363 F)
Fire Point (ASTM D-92) 212 C (414 F)
Autoignition Temperature (ASTM E-659) 374 C (705 F)
Kinematic Viscosity, at 40 C 29.6 cSt
Kinematic Viscosity, at 100 C 3.8 cSt
Density at 25 C 1005 kg/m3 (8.39 lb/gal)
Specific Gravity (60 F/60 F) 1.012
Coefficient of Thermal Expansion at 200 C 0.000819/C (0.000455/F)
Average Molecular Weight 252
Pour Point -32 C (-25 F)
Pumpability, at 2000 mm2/s (cSt) -3 C (27 F)
Pumpability, at 300 mm2/s (cSt) 11 C (52 F)
Minimum Temperatures for  

Fully Developed Turbulent Flow (Re = 10000)

10 ft/sec, 1-in tube

72 C (162 F)

20 ft/sec, 1-in tube

53 C (128 F)

Transition Region Flow (Re = 2000)

10 ft/sec, 1-in tube

35 C (96 F)

20 ft/sec, 1-in tube

26 C (78 F)
Boiling Range, 10% 348 C (658 F)
Boiling Range, 90% 392 C (738 F)
Normal Boiling Point 359 C (678 F)
Heat of Vaporization at Maximum Use Temp 345C 272 kJ/kg (117 Btu/lb)
Optimum Use Range 0-345 C (30-650 F)
Maximum Film Temperature 375 C (705 F)
Pseudocritical Temperature 569 C (1056 F)
Pseudocritical Pressure 24.3 bar (353 psia)
Pseudocritical Density 317 kg/m3 (19.8 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.

NO REPRESENTATIONS OR WARRANTIES, EITHER EXPRESS OR IMPLIED, OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR OF ANY OTHER NATURE ARE MADE HEREUNDER WITH RESPECT TO INFORMATION OR THE PRODUCT TO WHICH INFORMATION REFERS.

Therminol® is a registered trademark of Solutia Inc.

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