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Technical Data Sheet
Therminol® 66 Heat Transfer Fluid


Applications
  • HTF - aluminum foil printing
  • HTF - bakery
  • HTF - detergent
  • HTF - fine chemicals
  • HTF - food/feed/beverage processing
  • HTF - production of bioalcohol
  • HTF - production of biodiesel
  • Abs
  • Adhesives
  • Biomass - orc
  • Cement - waste heat recovery + orc
  • Chemicals & PETrochemicals
  • Fibers
  • Glass - waste heat recovery + orc
  • Hybrid solar + orc
  • Oil or gas processing
  • Oil recycling
  • Polyester (pet)
  • Polyethylene
  • Polymer & plastic
  • Polypropylene
  • Refining
  • Resins
  • Silicone
  • Solar csp
  • Specialty chemicals
  • Styrene
  • Tall oil
Key Attributes
  • Experience
  • Fouling Resistant
  • Proven Fluid
  • True 650° F (345° C) Performance

Product Description

Therminol 66 is the world’s most popular high-temperature, liquid-phase heat transfer fluid. Therminol 66 is pumpable at low temperatures, and offers high temperature thermal stability.

Performance Benefits

  • 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 excellent performance.
  • 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 bulk temperature.
  • Fouling Resistant—Therminol 66 is specifically engineered to resist solids formation and system fouling, providing more reliable operation and potential cost savings.

For more information, visit www.Therminol.com.



Typical Properties

PropertyTest MethodTypical Value, Units
General
Appearance Clear, pale yellow liquid
Composition Modified terphenyl
Recommended Bulk Temperature 345 °C (650 °F)
Maximum film temperature 375 °C (705 °F)
Normal Boiling Point 359 °C (678 °F)
Pumpability 
     @300 mm2/s (cSt) 11 °C (52 °F)
     @ 2000 mm2/s (cSt) -3 °C (27 °F)
Flash Point 
     COCASTM D92184 °C (363 °F)
     PMCCASTM D93170 °C (338 °F)
Autoignition TemperatureASTM E659374 °C (705 °F)
 DIN 51794399 °C (750 °F)
Pour PointISO 3016-32 °C (-25 °F)
Minimum liquid temperatures for fully developed turbulent flow (NRe > 10000) 
     10 ft/s, 1-in. tube (3.048 m/s, 2.54-cm tube) 72 °C (162 °F)
     20 ft/s, 1-in. tube (6.096 m/s, 2.54-cm tube) 53 °C (128 °F)
Minimum liquid temperatures for transitional region flow, (NRe > 2000) 
     10 ft/s, 1-in. tube (3.048 m/s, 2.54-cm tube) 35 °C (96 °F)
     20 ft/s, 1-in. tube (6.096 m/s, 2.54-cm tube) 26 °C (78 °F)
Coefficient of thermal expansion 
     @ 200°C 0.000819 /°C (0.000455 /°F)
Viscosity, Kinematic 
     @ 100°CASTM D 4453.80 cSt, mm2/s
     @ 40°CASTM D 44529.6 cSt, mm2/s
Liquid Density 
     @ 15°CASTM D 40521012 kg/m3 (8.44 lb/gal)
     @ 25°CASTM D 40521005 kg/m3 (8.4 lb/gal)
AcidityASTM D 664<0.2 mg KOH/g
Molecular Weight (Average) 252
Pseudocritical temperature 569 °C (1056 °F)
Pseudocritical pressure 24.3 bar (353 psia)
Pseudocritical density 317 kg/m3 (19.8 lb/ft3)
Copper CorrosionASTM D 130<<1a
Moisture Content, maximumASTM E-203150 ppm
Dielectric Constant 
     @ 23°CASTM D-9242.61



Comments
Properties reported here are typical of average lots. Eastman makes no representation that the material in any particular shipment will conform exactly to the values given.
Eastman and its marketing affiliates shall not be responsible for the use of this information, or of any product, method, or apparatus mentioned, and you must make your own determination of its suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. No warranty is made of the merchantability of fitness of any product, and nothing herein waives any of the Seller's conditions of sale.

1/7/2021 11:03:53 AM