THERMINOL® 66 Synthetic Heat Transfer Fluid  

Product description

THERMINOL®66 is the most widely used liquid-phase high temperature heat transfer fluid in the world. It can be used in  -7 ℃ ~345 ℃ applications and delivers important performance: high thermal stability, high degree of customer satisfaction, reliability and fouling resistant.


THERMINOL®66 is widely used in the industrial fields including
chemical fiber industry
petrochemical industry
plastic industry
petroleum industry.

For more information on Therminol 66 systems and applications, please E-mail us or contact our sales representative. 

Typical properties

Optimum use range: -7 ℃ ~345 ℃


Clear, pale  yellow liquid


Modified terphenyl



Flash point

184 ℃

Fire point

212 ℃

Autoignition point

374 ℃

Kinematic viscosity
40 ℃
100 ℃


Density (25 ℃ )


Specific gravity(20 ℃ /20 ℃)


Coefficient of thermal expansion (200 ℃ )

0.000819/ ℃

Average molecular weight


Pour point

-32 ℃


-3 ℃
11 ℃

Minimum temperature for  fully developed  turbulent flow (Re=10000)
10 feet/second, 1 inch tube
20 feet/second, 1 inch tube

72 ℃
53 ℃

Minimum temperature for  transition region flow (Re=2000)
10 feet/second, 1 inch tube
20 feet/second, 1 inch tube

35 ℃
26 ℃

Boiling range

348 ℃
392 ℃

Normal boiling point 

359 ℃

Heat of vaporization at maximum use  temperature 345 ℃


Optimum use range

0~345 ℃

Maximum film temperature

375 ℃

Pseudocritical temperature

569 ℃

Pseudocritical pressure


Pseudocritical density


These data are based upon samples tested in the laboratory and  are not guaranteed for all  samples. Please E-mail us or contact our sales representative for more detailed properties or sales specifications of THERMINOL® 66.

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 representation or warranties as to the completeness or accuracy thereof.  Information is supplied upon the condition that the persons receiving same will make their own determinations as to its suitability for their purpose 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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