Paratherm™ MR Heat Transfer Fluid

Paratherm™ MR Heat Transfer Fluid

Single Fluid Heating/Cooling

Paratherm™ MR Heat Transfer Fluid is a mid-range heat transfer fluid rated for service from 36°F to 550°F. It is efficient across the temperature range, thermally stable and cost-effective. Paratherm MR is NSF HT-1 certified for food-grade applications. Used or contaminated fluid can be safely combined with spent lubricating oils and recycled locally. Paratherm MR is designed for a broad variety of applications such as batch reactors, laminating lines and plastics mold temperature control. It is engineered to provide outstanding performance under demanding conditions.

  • Single fluid heating and cooling from 36°F to 550°F
  • Non-aromatic/low odor composition reduces worker exposure and environmental issues
  • Improved low-temperature capability vs standard mineral oil-based heat transfer fluids

Environmental Safety

Paratherm MR Heat Transfer Fluid is plant friendly and safe to use. In the event of a release, the same simple clean-up procedures used for spills of light lubricating oils can be employed. Recovered fluid can be combined with spent lube oils and sent to the local oil recycler. Paratherm MR is a high purity, water-white fluid and contains no SARA-reportable substances, such as chlorinated hydrocarbons, aromatics, heavy metals, or sulfur or nitrogen compounds.

Worker Safety

Unlike other heat/cool liquids, the MR fluid emits no pungent or noxious odors. See the Material Safety Data Sheet (SDS) before using this product.

Vapor Pressure

Paratherm MR Heat Transfer Fluid has an extraordinarily low vapor pressure — a fraction of an atmosphere at its maximum operating temperature of 550°F. This permits the designer considerable latitude in the choice of lower-cost equipment that does not need to be pressurized to prevent fluid boiling and pump cavitation.


The lower a heat transfer fluid’s viscosity, the less energy will be required to pump it through the system. Paratherm MR fluid’s viscosity is among the lowest of available heat/cool fluids. This and the fluid’s exceptionally low-pressure drop means that less horsepower is needed for a given duty and that a smaller pump and motor can be specified. And, lower power consumption continues to produce savings year after year.

Chemical Name Linear Alkene
Appearance Water White Liquid
Odor Slight Odor
Maximum Recommended Film Temperature  600°F/316°C
Maximum rec’d operating temp – fired heaters 550°F/288°C
Maximum rec’d operating temp – all others  580°F/304°C
Minimum operating temperature 20 cPs (20 mPa-s)  38°F/3°C)
Minimum start-up temp 300 cPs (300 mPa-s)  -37°F/-38°C
Viscosity @ 60°F/15.5°C sSt (mm2/sec) 13
Density @ 60°F/15.5°C lb/gal (kg/m3 ) 6.7 (804)
Flash Point Pensky-Martens Closed Cup (D93) >300°F/149°C
Boiling Point (14.7 psia/101 kPa) >650°F/343°C
Vapor Pressure @ max operating temp psia (kPa)  8.4 (61)
% Volume expansion over rec’d operating temp per 100°F (°C) 4.4 (7.9)
Average Molecular Weight 300
Heat of Combustion (approximate) BTU/lb (kJ/kg) 20,000 (46,300)
Heat of Vaporization (approximate) BTU/lb (kJ/kg) 115 (266)

* These are typical laboratory values, and are not guaranteed for all samples.
** Note: Normal practice is to size expansion tanks so that they are
1/4 to 1/3 full when the system is cold, and 2/3 to 3/4 full when the system is at the maximum normal operating temperature.

Paratherm Heat Transfer Fluids

Critical Temperature, Tc(Calculated)
Units HR™ NF© HE© OR© MR™ LR™ CR™
ºR 1465 1453 1580 1524 1358 1174 1168
ºF 1005 993 1120 1064 899 714 709
K 814 807 878 847 755 652 649
Critical Pressure, Pc(Calculated)
Units HR™ NF© HE© OR© MR™ LR™ CR™
ATM 18.7 11.1 26.5 13.3 12.9 10.7 28.6
PSIA 274 163 389 196 190 157 421
Critical Volume, Vc(Calculated)
Units HR™ NF© HE© OR© MR™ LR™ CR™
cm3/g-mole 816 1579 720 1380 987 1327 493
ft3/lb 0.037 0.072 0.033 0.063 0.045 0.06 0.023
Heat of Vaporization,DH vap
Units HR™ NF© HE© OR© MR™ LR™ CR™
BTU/lb 110 91 77 93 115 113 148
Molecular Weight avg
Units HR™ NF© HE© OR© MR™ LR™ CR™
MW 239 350 445 360 230 160 133
k=Cp/Cv = 1.01
C’ = 316.5
R = 82.06 cm3*atm/mol*K
Fb = 1.0

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