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Technical Data Sheet
Therminol® VP1 Heat Transfer Fluid

  • HTF - fine chemicals
  • HTF - production of bioalcohol
  • HTF - production of biodiesel
  • Adhesives
  • Calendar roll heating
  • Chemicals & PETrochemicals
  • Distillation
  • Extruding
  • Fatty acid
  • Fibers
  • Formaldehyde
  • Gas to liquid (gtl)
  • Gas treatment / sweetening / desulpheriz
  • Lube oil refining
  • Methyl methyl acrylate (mma)
  • Polyester (pet)
  • Refining
  • Resins
  • Solar csp
  • Specialty and batch chemical production
  • Specialty chemicals
  • Styrene
  • Tall oil
  • Terephthalic acid (pta)
  • Waste heat recover + orc
Key Attributes
  • Low Viscosity
  • Precise Temperature Control
  • Superb Heat Transfer Properties
  • Vapor Phase Heat Transfer Fluid

Product Description

Therminol VP-1 heat transfer fluid is an ultra-high temperature synthetic heat transfer fluid designed to meet the demanding requirements of vapor phase systems or liquid phase systems.

Performance Benefits

  • Superb Heat Transfer Properties—Therminol VP-1 is a synthetic heat transfer fluid which combines exceptional thermal stability and low viscosity for efficient, dependable, uniform performance in a wide optimum use range of 12° to 400°C (54° to 750°F ). Therminol VP-1 has the highest thermal stability of all organic heat transfer fluids.
  • Low Viscosity—Therminol VP-1 has a low viscosity to 12°C (54°F). Because of its crystallization point of 12°C (54°F), this fluid may require tracing in colder climates to avoid operational problems.
  • Vapor Phase Heat Transfer Fluid—Therminol VP-1 is a eutectic mixture of diphenyl oxide (DPO) and biphenyl. It can be used as a liquid heat transfer fluid or as a boiling-condensing heat transfer medium up to its maximum use temperature. It is miscible and interchangeable (for top-up or design purposes) with other similarly constituted diphenyl-oxide (DPO)/biphenyl fluids.
  • Precise Temperature Control—Due to its ability to operate as a vapor-phase heat transfer fluid, Therminol VP-1 is excellent for use in heat transfer fluid systems requiring very precise temperature control.

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Typical Properties

PropertyTest MethodTypical Value, Units
Appearance Clear, water white liquid
Composition Biphenyl/diphenyl oxide (DPO) eutectic mixture
Maximum bulk temperature 400 °C (750 °F)
Maximum film temperature 430 °C (800 °F)
Normal Boiling Point 257 °C (495 °F)
Crystallization Point 12 °C (54 °F)
Flash Point 
     COCASTM D92124 °C (255 °F)
     PMCCASTM D93110 °C (230 °F)
Autoignition TemperatureASTM E659601 °C (1114 °F)
 DIN 51794621 °C (1150 °F)
Coefficient of thermal expansion 
     @ 200°C 0.000979 /°C (0.000544 /°F)
Heat of Vaporizationa 206 kJ/kg (88.7 Btu/lb)
Viscosity, Kinematic 
     @ 100°CASTM D 4450.99 cSt, mm2/s
     @ 40°CASTM D 4452.48 cSt, mm2/s
Liquid Density 
     @ 15°CASTM D 40521068 kg/m3 (8.91 lb/gal)
     @ 25°CASTM D 40521060 kg/m3 (8.85 lb/gal)
AcidityASTM D 664<0.2 mg KOH/g
Molecular Weight (Average) 166
Pseudocritical temperature 499 °C (930 °F)
Pseudocritical pressure 33.1 bar (480 psia)
Pseudocritical density 327 kg/m3 (20.4 lb/ft3)
Sulfur ContentASTM D-7691<10 ppm
Copper CorrosionASTM D 130<<1a
Moisture Content, maximumASTM E-203300 ppm
Volume contraction upon freezing 6.27 %
Volume expansion upon melting 6.69 %
Surface Tensionb 
     @ 25°C 36.6 dynes/cm
Dielectric Constant 
     @ 23°CASTM D-9243.35

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.

10/24/2019 4:38:35 PM