Click for PDF
Technical Data Sheet
Therminol® LT Heat Transfer Fluid

  • HTF - active pharmaceutical ingredients
  • HTF - fine chemicals
  • HTF - pharmaceutical processing
  • Environmental test chambers
  • Fibers
  • Formaldehyde
  • Specialty and batch chemical production
  • Specialty chemicals
Key Attributes
  • Excellent Low Temperature Performance
  • Low Viscosity
  • Vapor Phase Operation

Product Description

Therminol LT is a synthetic aromatic heat transfer fluid. It can be used in both liquid phase and vapor phase, and has excellent heat transfer and fluid properties for low temperature applications.

Performance Benefits

  • Low Viscosity—Low viscosity at exceptionally low temperatures makes Therminol LT excellent for pumping extreme cooling applications.
  • Excellent Low-Temperature Performance—Therminol LT has the best low-temperature heat transfer coefficient of all coolant fluids. Therminol LT has excellent heat transfer properties to -75°C (-100°F).
  • Vapor Phase Operation—Therminol LT can be used in the liquid phase between -75°C (-100°F) and 315°C (600°F). With a boiling point of 181°C (358°F) at ambient pressure, Therminol LT can be used in the vapor-phase above 181°C (358°F).

For more information, visit

Typical Properties

PropertyTest MethodTypical Value, Units
Appearance Clear, light yellow liquid
Composition Alkyl substituted aromatic
Recommended Bulk Temperature 315 °C (600 °F)
Maximum film temperature 345 °C (650 °F)
Normal Boiling Point 181 °C (358 °F)
     @300 mm2/s (cSt) -75 °C (-103 °F)
Crystallization Point -75 °C (-103 °F)
Autoignition TemperatureASTM E659412 °C (774 °F)
 DIN 51794429 °C (804 °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) -66 °C (-87 °F)
     20 ft/s, 1-in. tube (6.096 m/s, 2.54-cm tube) <-73 °C (-100 °F)
Minimum vapor temperatures for fully developed turbulent flow (NRe > 10000) 
     10 ft/s, 1-in. tube (3.048 m/s, 2.54-cm tube) 139 °C (283 °F)
     20 ft/s, 1-in. tube (6.096 m/s, 2.54-cm tube) 116 °C (241 °F)
Coefficient of thermal expansion 
     @ 100°C 0.001080 /°C (0.000600 /°F)
Heat of Vaporizationa 223 kJ/kg (95.7 Btu/lb)
Viscosity, Kinematic 
     @ 100°CASTM D 4450.48 cSt, mm2/s
     @ 40°CASTM D 4450.81 cSt, mm2/s
Molecular Weight (Average) 134
Pseudocritical temperature 377 °C (710 °F)
Pseudocritical pressure 34.5 bar (500 psia)
Pseudocritical density 298 kg/m3 (2.49 lb/ft3)
Moisture Content, maximumASTM E-20380 ppm
Surface Tensionb 
     @ 25°C 28.0 dynes/cm
Dielectric Constant 
     @ 23°CASTM D-9242.3

aat maximum use temperature
bin air

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.

8/26/2020 5:00:22 AM