Therminol® D-12 Heat Transfer Fluid


Therminol D-12 is a synthetic, liquid phase heat transfer fluid with excellent heat transfer properties over a wide temperature range. This fluid is ideally complement for applications that need efficient cooling and heating.

Performance Benefits

  • Heating or Cooling Operation—Therminol D-12 is ideally suited for combination heating and cooling applications and delivers great heat transfer rates even at -45°C (-50°F). Batch processes will benefit from the excellent cooling performance Therminol D-12 delivers. Therminol D-12 also may be used as a secondary coolant or “brine” in refrigeration loops where a broad range of properties is desired.
  • Easy Operation—Using Therminol D-12 avoids using multiple fluids in the same piece of equipment.
  • Low Cost—Therminol D-12 delivers better thermal performance at lower cost than competing fluids.
  • Low Odor and Excellent Toxicity Profile—Therminol D-12 is NSF registered with HT1 status, surpassing requirements for use where there is the possibility of incidental food contact.

Typical Properties

PropertyTest MethodTypical Value, Units
AppearanceClear, water-white liquid
Composition Synthetic hydrocarbons
Maximum bulk temperature230 °C (450 °F)
Maximum Film Temperature245 °C (475 °F)
Normal Boiling Point192 °C (378 °F)
@ 300 mm2/s (cSt)
@ 2000 mm2/s (cSt)

-82 °C (-116 °F)
-94 °C (-137 °F)
Autoignition TemperatureASTM E659
DIN 51794
247 °C (477 °F)
277 °C (531 °F)
Coefficient of thermal expansion @ 100°C0.001122 /°C (0.00062 /°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)
20 ft/s, 1-in. tube (6.096 m/s, 2.54-cm tube)

-37 °C (-35 °F)
-51 °C (-59 °F)
Minimum liquid temperatures for transitional region flow, (NRe > 2000)
10 ft/s, 1-in. tube (3.048 m/s, 2.54-cm tube)
20 ft/s, 1-in. tube (6.096 m/s, 2.54-cm tube)

-64 °C (-82 °F)
-71 °C (-96 °F)
Viscosity, Kinematic
@ 40°C

ASTM D 445
ASTM D 445

0.65 cSt, mm2/s
1.23 cSt, mm2/s
Molecular Weight (Average)162
Pseudocritical temperature360 °C (680 °F)
Pseudocritical pressure16.2 bar (235 psia)
Pseudocritical density229 kg/m3 (14.1 lb/ft3)
Dielectric Constant @ 23°CASTM D-9242.02
Moisture Content, maximumASTM E-20380 ppm
Properties reported here are typical of average lots.

Key Attributes

  • Easy Operation
  • Heating or Cooling Operation
  • Low Cost
  • Low Odor and Great Toxicity Profile


  • htf – active pharmaceutical ingredients
  • htf – food/feed/beverage processing
  • htf – pharmaceutical processing
  • Environmental test chambers
  • Specialty and batch chemical production
  • Specialty chemicals

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