Paratherm™ OR Heat Transfer Fluid

Paratherm™ OR Heat Transfer Fluid

Sludge Resistant, Non-Fouling, Non-Toxic

The Paratherm OR sludge-resistant heat transfer fluid has substantial oxidation resistance and extended service life. This zero-pressure fluid provides precise, uniform temperature control to 500°F in closed-loop thermal oil systems where the heat transfer fluid is more than occasionally exposed to air. The OR fluid is comprised of a unique high-stability base plus high-performance oxidation inhibitor/stabilizer. Performance of the OR fluid is particularly impressive under the same grueling conditions that quickly cause severe oxidation, and sludge formation in conventional heat transfer fluids.

Designed for:

  • Extruders
  • Die temperature control units
  • Easy on quick-connects
  • Safe, easy disposal

Oxidation

Heavy fluid oxidation occurs when supplies of fresh air come into intimate contact with hot heat transfer fluid (during frequent tool changeout, for example). The resulting reaction converts fluid molecules to organic acids. Soon the acids themselves begin to degrade thermally. The fluid becomes thicker, darker and more odorous, and its heat transfer capabilities drop dramatically.

Fouling

As an oxidized fluid becomes more viscous, it becomes more difficult to pump and more susceptible to overheating. Remaining in contact with the heated surfaces too long, the fluid picks up more heat than its chemical bonds can stand. As they break down, the fluid’s molecules release their carbon forming an acidic, carbonaceous sludge that precipitates out and adheres to the system’s interior surfaces. Much of this sooty, sticky carbon bakes on to the heated surfaces where it was produced. The OR fluid contains an additive system that inhibits sludge and carbon formation. Even under prolonged exposure to air, the fluid won’t foul heated surfaces.

Efficiency

Due to its low viscosity, the OR fluid provides unusually high thermal efficiencies — higher than most synthetics. The lower in viscosity (the thinner) a heat transfer fluid is, the less energy is required to pump it through the system. In addition a smaller pump and motor can be specified, and the lower power consumption will continue to produce savings year after year.

Typical Properties*

Feedstock Hydrotreated Natural hydrocarbon
Color  Transparent, Water-White
Taste & Odor None
Optimum Use Range 175°F to 550°F
(79°C to 288°C)
Maximum Recommended Film Temperature 600°F (316°C)
Flash Point (coc) ASTM D-92 350°F (177°C)
Fire Point (coc) ASTM D-92 395°F (202°C)
Atmospheric Boiling Point, 10% Fraction, ASTM D-1160  631°F (333°C)
Vapor Pressure, psia @ 500°F (260°C) 0.948
Pour Point ASTM D-97 -35°F (-37°C)
Specific Gravity, 60/60 ASTM D-1298 0.8863
Thermal Expansion** 0.0004/°F
0.0007/°C
Density @75°F (24°C)
ASTM D-4052
7.23 lb/gal
Viscosity @ 40°C  ASTM D-445 40.12 cSt
Average Molecular Weight ASTM D-2502 360
Total Acid Number (TAN)
ASTM D974
0.01
Heat of Vaporization, Calculated 93 BTU/lb
Electrical Properties
Dielectric Strength kV/cm (disk) ASTM D-877 >35
Dissipation Factor @ 25°C, 60 Hz ASTM D-924 0.0002

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

Constants

k=Cp/Cv =

1.01

C’ =

316.5

R =

82.06 cm3*atm/mol*K

Fb =

1.0

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