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Therminol 55
Heat Transfer Fluid


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Product Description
Therminol 55 is a synthetic heat transfer fluid used in moderate temperature applications (-15 F to 550 F or -25C to 290C). Therminol 55 delivers a number of important performance benefits:

  • Long Life - Therminol 55 is a true 550 F (290 C) fluid. You will get years of reliable, cost effective performance, even when operating your system continuously at 550 F (290 C). This means you do not have to over specify your fluid.
  • Non Fouling - Because Therminol 55 is a synthetic fluid, it resists the effects of oxidation 10 times better than mineral oils. Less oxidation means less solids formation and much less fouling. For systems without nitrogen inerting, the performance advantages are significant.
  • Superb Low Temperature Pumpability - Therminol 55 is still pumpable at -15 F (-25 C), long after mineral oils have become jelly-like. In fact, some mineral oils will not pump at temperatures below 20 F (-7 C). With Therminol 55, your heat transfer fluid system can start-up quickly and easily.
  • Low Cost - This list of performance features does not cost a fortune. Call to see how affordable Therminol 55 can be.

Applications
Therminol 55 is used in a wide variety of industries, such as:
  • Natural Gas purification
  • Plastics/molding operations
  • Asphalt and Petroleum Product Storage
  • Biodiesel
For more information on Therminol 55 systems and applications e-mail us or contact the Therminol Technical Service Hotline at 1-800-433-6997.

Detailed Properties
Click here to download the product bulletin containing detailed physical and transport properties for Therminol 55.

Typical Properties

Therminol® 55
Heat Transfer Fluid

Operating Range -25 C to 290 C (-15F to 550 F)

Appearance Clear yellow liquid
Composition Synthetic hydrocarbon mixture
Moisture Content, Maximum 250 ppm
Flash Point (ASTM D-92) 177 C (350 F)
Fire Point (ASTM D-92) 218 C (425 F)
Autoignition Temperature (ASTM E-659) 343 C (650 F)
Kinematic Viscosity, at 40 C 19.0 cSt
Kinematic Viscosity, at 100 C 3.5 cSt
Density at 25 C 868 kg/m3 (7.25 lb/gal)
Specific Gravity (60 F/60 F) 0.876
Coefficient of Thermal Expansion at 200 C 0.000961/C (0.000534/F)
Average Molecular Weight 320
Pour Point -54 C (-65 F)
Pumpability, at 2000 mm2/s (cSt) -28 C (-19 F)
Pumpability, at 300 mm2/s (cSt) -8 C (17 F)
Minimum Temperatures for  

Fully Developed Turbulent Flow (Re = 10000)

10 ft/sec, 1-in tube

67 C (152 F)

20 ft/sec, 1-in tube

45 C (114 F)

Transition Region Flow (Re = 2000)

10 ft/sec, 1-in tube

24 C (75 F)

20 ft/sec, 1-in tube

11 C (52 F)
Boiling Range, 10% 340 C (644 F)
Boiling Range, 90% 390 C (734 F)
Normal Boiling Point 351 C (664 F)
Heat of Vaporization at Max. Use Temp 290C 228 kJ/kg (98.1 Btu/lb)
Optimum Use Range -25C to 290C (-15F to 550F)
Extended Maximum Use Temperature 315 C (600 F)
Maximum Film Temperature 335 C (635 F)
Pseudocritical Temperature 512 C (953 F)
Pseudocritical Pressure 13.2 bar (191 psia)
Pseudocritical Density 258 kg/m3 (16.1 lb/ft3)

NOTICE: Although the information and recommendations set forth herein (hereinafter "Information") are presented in good faith and believed to be correct as of the date hereof, Solutia makes no representations or warranties as to the completeness or accuracy thereof. Information is supplied upon the condition that the persons receiving same will make their own determination as to its suitability for their purposes prior to use. In no event will Solutia be responsible for damages of any nature whatsoever resulting from the use of or reliance upon Information or the product to which Information refers. Nothing contained herein is to be construed as a recommendation to use any product, process, equipment or formulation in conflict with any patent, and Solutia makes no representation or warranty, express or implied, that the use thereof will not infringe any patent.

NO REPRESENTATIONS OR WARRANTIES, EITHER EXPRESS OR IMPLIED, OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE OR OF ANY OTHER NATURE ARE MADE HEREUNDER WITH RESPECT TO INFORMATION OR THE PRODUCT TO WHICH INFORMATION REFERS.

Therminol® is a registered trademark of Solutia Inc.

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