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Technical Data Sheet
Therminol® VLT Heat Transfer Fluid

  • HTF - chiral chemistry processes
  • HTF - pharmaceutical processing
  • Specialty and batch chemical production
  • Specialty chemicals
  • Specialty heat-sensitive polymers
  • Styrene
Key Attributes
  • Cooling and/or Heating Operation
  • Easy Operation
  • Very Low Temperature Operation

Product Description

Therminol VLT is a synthetic, liquid phase heat transfer fluid with excellent heat transfer and fluid properties for extremely low-temperature applications. This fluid is ideally suited for single-fluid heating and cooling systems.

Performance Benefits

  • Very low temperature operation—Therminol VLT has excellent heat transfer performance at extremely low temperatures and offers the benefits of liquid coolant temperature control.
  • Cooling and/or Heating Operation—Therminol VLT allows a single fluid to be used in many general-purpose processes where both cooling and heating are required. The properties of Therminol VLT allow the same equipment to be used over its wide range of operation.
  • Easy Operation—Using Therminol VLT avoids the problems of using multiple fluids in the same piece of equipment and allows low-temperature operation with normal centrifugal pumps.

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Typical Properties

PropertyTest MethodTypical Value, Units
Appearance Water-white liquid
Composition Methylcyclohexane/trimethylpentane mixture
Recommended Bulk Temperature 175 °C (350 °F)
Maximum film temperature 210 °C (410 °F)
Normal Boiling Point 99 °C (211 °F)
     @300 mm2/s (cSt) -126 °C (-195 °F)
Cloud Point -135 °C (-211 °F)
Autoignition TemperatureASTM E659264 °C (507 °F)
 DIN 51794294 °C (562 °F)
Pour PointASTM D 97-135 °C (-211 °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) -76 °C (-105 °F)
     20 ft/s, 1-in. tube (6.096 m/s, 2.54-cm tube) -93 °C (-135 °F)
Minimum liquid temperatures for transitional region flow, (NRe > 2000) 
     10 ft/s, 1-in. tube (3.048 m/s, 2.54-cm tube) -108 °C (-163 °F)
     20 ft/s, 1-in. tube (6.096 m/s, 2.54-cm tube) -118 °C (-180 °F)
Coefficient of thermal expansion 
     @ 200°C 0.001420 /°C (0.000786 /°F)
Heat of Vaporizationa 252.3 kJ/kg (108.6 Btu/lb)
Viscosity, Kinematic 
     @ 100°CASTM D 4450.41 cSt, mm2/s
     @ 40°CASTM D 4450.71 cSt, mm2/s
Liquid Density 
     @ 25°CASTM D 4052744 kg/m3 (6.21 lb/gal)
AcidityASTM D 664<0.2 mg KOH/g
Molecular Weight (Average) 102
Pseudocritical temperature 299 °C (570 °F)
Pseudocritical pressure 35 bar (521.7 psia)
Pseudocritical density 267.8 kg/m3 (16.72 lb/ft3)
Copper CorrosionASTM D 130<<1a
Moisture Content, maximumASTM E-20380 ppm
Dielectric Constant 
     @ 23°CASTM D-9241.99

aat maximum use temperature

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.

3/24/2020 2:45:51 AM