Paratherm™ CR Heat Transfer Fluid

Paratherm™ CR Heat Transfer Fluid


Low-Temperature Process Cooling to -88°C (-127°F)

Paratherm™ CR heat transfer fluid is a unique blend of synthetic components formulated to provide superior cooling performance in closed-loop heat-transfer systems operating down to -88°C (-127°F) yet is capable of maintenance free operation up to 218° C (425°F).

Get 10ºC colder without changing your equipment…

  • 20% Increase in Flow Rate
  • No Equipment Modifications
  • 10°F Lower Operation, Same Viscosity
  • Aerospace Testing Fluid
  • Fine Chemical Processes,Pharmaceutical Production

Applications include:

  • Fine and Specialty Chemical Processing
  • Pharmaceutical production
  • Environmental test chambers

Increased capacity in existing systems

In the cryogenic temperature range, Paratherm CR has significantly lower viscosity than silicone based heat transfer fluids. Simply replacing existing fluid with Paratherm CR can increase the cooling output of the system by up to 50% at -70°C and up to 70% at -90°C.

Easier to work with

Paratherm CR will not leave a slippery residue on surfaces if it leaks out. Water will not accelerate fluid degradation or cause significant changes in the freeze point. Testing has shown that Paratherm CR will not cause copper tubing to oxidize if water is present, thus offering designers more flexibility in material selection.

Typical properties*

Chemical NameSynthetic Hydrocarbon Blend
AppearanceWater White Liquid
OdorSweet Odor
Maximum Recommended Film Temperature 550°F (288°C)
Maximimum Recommended Operating Temperature425°F (218°C)
Minimum Operating Temperature 20 cPs (20mPa-s) -127°F (-88°C)
Minimum Start-up Temperature 300 cPs (300 mPa-s)  -170°F (-112°C)
Viscosity @ 60°F/15.5°C sSt (mm2/sec)1
Density @ 60°F/15.5°C lb/gal (kg/m3 )6.9 (833)
Flash Point Closed Cup (D56)>104°F (40°C)
Autoignition Temperature (max 10 sec ignition delay)>430°F (221°C)
Freeze Point<-166°F/<-110°C
Boiling Point (14.7 psia/101 kPa)358°F/182°C
Vapor Pressure @ maximum operating temperature psia (kPa)21 (148)
% Volume expansion over recommended operating temperature per 100°F (°C)8.7 (15.7)
Average Molecular Weight130
Dielectric Breakdown voltage D1816-04 (kV, 0.1″ gap)36.11
Dielectric Constant (1KHz) D924-042.59
Dissipation Factor (1 KHz) D924-040.00145
Volume Resistivity at 100V (?-cm) D257-078.3 X 1011
Heat of Combustion (approximate) BTU/lb (kJ/kg)17,000 (39,400)
Heat of Vaporization (approximate) BTU/lb (kJ/kg)148 (343)

Paratherm Heat Transfer Fluids

Critical Temperature, Tc(Calculated)UnitsHR™NF©HE©OR©MR™LR™CR™
Critical Pressure, Pc(Calculated)UnitsHR™NF©HE©OR©MR™LR™CR™
Critical Volume, Vc(Calculated)UnitsHR™NF©HE©OR©MR™LR™CR™
Heat of Vaporization,DH vapUnitsHR™NF©HE©OR©MR™LR™CR™
Molecular Weight avgUnitsHR™NF©HE©OR©MR™LR™CR™


k=Cp/Cv =1.01
C’ =316.5
R =82.06 cm3*atm/mol*K
Fb =1.0

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